Science & Engineering Tools

40 kHz ultrasonic standing wave acoustic trap. Non-contact levitation of micro-beads and liquid droplets suspended in mid-air at acoustic pressure nodes.

International acre is exactly 4,046.8564224 m²; a hectare is 10,000 m² (a 100 m square). UK land ads mix acres and hectares. Edit any field.

Body Mass Index

Find the exact point on the far side of the planet from anywhere, then drill a straight frictionless tunnel to any second place and drop a capsule down it. The fall time is integrated through the r...

Calculate pixel dimensions while locking exact aspect ratios (16:9 widescreen, 9:16 vertical TikTok/Shorts, 4:3 classic, 1:1 square, 21:9 cinema). Generates modern CSS `aspect-ratio` code snippets.

Planets move in elliptical orbits with the Sun at one focus.

Kristian Birkeland's Terrella experiment. Solar wind plasma streams channeled along geomagnetic dipole field lines excite shimmering atmospheric auroral ovals.

High-frequency Tesla coil discharge globe. Noble gas ionization streamers branch from the central electrode and focus to your touch via capacitive coupling.

Tyre, compressor and scuba pressures. 1 bar = 100 kPa = 14.5038 psi. Standard atmosphere is 101.325 kPa (14.696 psi). Gauge vs absolute is your problem — this is a unit convert only.

Hours ≈ (capacity mAh × (voltage / load voltage) × efficiency) / load mA. A 2000 mAh cell at 100 mA is about 20 hours at 100% — real packs are less because of cut-off voltage and converter loss.

Accounts for battery aging, temperature, and discharge limits

Compute natural flexural vibration eigenfrequencies and mode shapes for structural beams ($EI \frac{\partial^4 w}{\partial x^4} + \rho A \frac{\partial^2 w}{\partial t^2} = 0$). Inspect nodal point...

Convert wind speed to a Beaufort force (0–12) using the Met Office mean-speed bands. Force is a class, not a precision instrument. Gusts can sit a force higher than the mean.

Aerodynamic levitation exhibit. High-velocity air jet traps a floating sphere via Bernoulli low-pressure depression and Coandă wall adhesion even when tilted.

Calculate and explore basic biology values. Choose a tool, enter values, and get results with formulas. Educational tool for understanding biological calculations.

Bioluminescence is the miracle of "cold light"—producing near 100% luminous efficiency with zero thermal waste. Discover how enzyme Luciferase oxidizes substrate Luciferin using cellular ATP, agita...

Look up boiling points of common substances at 1 atm. Converts between Celsius, Fahrenheit, and Kelvin. Values are at standard pressure (1 atm). Actual boiling points may vary with altitude and pur...

In 1696, Johann Bernoulli challenged the world to find the path of fastest descent between two points under gravity. The answer is not a straight line—it is a cycloid! Test the race in real-time an...

Estimate breaker size for a circuit. Always verify with a qualified electrician and local electrical codes. ⚠️ Educational only — not for actual electrical installations.

Virtual measurement and leveling tools using device sensors. Requires camera and motion sensor permissions.

Instant, free online Cable Length & Voltage Drop tool. No signup required.

Calculate capacitor values, RC time constants, impedance, and filter characteristics. ⚠️ Educational only — verify with datasheets and professional standards.

°F = °C × 9/5 + 32. Kelvin = °C + 273.15. Absolute zero is 0 K (−273.15 °C). Edit any box — weather, ovens and science labs all use different scales.

Nonlinear chaos theory exhibit. A metallic pendulum swings over three magnetic attractors, demonstrating sensitive dependence on initial conditions.

Precision wet-lab chemistry solver for serial dilutions ($C_1 V_1 = C_2 V_2$) and molarity-to-mass conversions ($\text{Mass} = M \times V \times \text{MW}$) with step-by-step bench pipetting protoc...

Calculate circuit load, breaker size, and wire sizing. Perfect for DIY projects and planning.

A falling climber does not load the system with their body weight — they load it with several times that, and the top runner takes more than the climber does. This works out impact force from the f...

Generate algorithmic color harmonies (Complementary, Triadic, Analogous, Split) and verify accessibility with real-time WCAG 2.1 AA/AAA contrast ratio verification.

Learn the 16-point compass rose: convert between named bearings and degrees, then practise reading them on a marked compass — forward and back bearings, with instant feedback. Runs in your browser,...

Calculate conduit sizes based on NEC requirements, wire types, and installation conditions. ⚠️ Disclaimer: For educational purposes. Always consult NEC codebook and licensed electrician.

Light is a loan with interest. Museums cap both instant lux and lux-hours per year. Pick a material class, the gallery level and the hours the case is lit. The plaque says whether the year is still...

One position, every notation: GPS decimal degrees, degrees-minutes-seconds, marine DDM, UTM, MGRS, the British Ordnance Survey grid, geohash, Plus Code and the Maidenhead locator used by radio amat...

Nothing "curves" in the air — but on a rotating planet, straight motion looks curved. Throw a ball across a spinning disk, then watch the same physics organise hurricanes: right-deflected in the no...

Supersaturated alcohol vapor chamber detecting cosmic muons and subatomic radioactive decay tracks via ion-nucleated condensation.

Simulate multi-degree-of-freedom coupled mechanical oscillators. Observe symmetric ($\omega_1$) vs anti-symmetric ($\omega_2$) normal modes and cyclic mechanical energy sloshing ($T_{beat}$).

Build simple cubic, BCC, FCC, diamond, rock-salt, CsCl and HCP crystals in 3D, slice them with any Miller plane (hkl), and calculate theoretical density, packing fraction, coordination number, d-sp...

Acoustic resonance installation. Granular silica particles migrate across a vibrating resonant Chladni plate into standing wave geometric nodal lines.

Explore Ernst Chladni's 1787 acoustic nodal resonance figures. Observe sand grains scatter away from high-amplitude vibrating antinodes and crystallize into intricate geometric standing wave geomet...

Analyze classical mass-spring-damper dynamics ($m\ddot{x} + c\dot{x} + kx = F_0\cos\omega t$). Inspect damping ratios ($\zeta$), Q-factor resonance peaks, phase lag, and transient vs steady-state r...

Analyze atmospheric water vapor psychrometrics using Magnus-Tetens formulas. Calculate exact Dew Point ($T_{dp}$), saturation vapor pressure ($e_s$), moisture humidity ratio ($W$), and surface cond...

Optical spectrometer bench. High-density holographic diffraction grating disperses atomic gas emission into discrete quantum spectral fingerprints.

Type any DNA sequence and watch it become a spinning double helix — with correct A‑T / G‑C pairing, hydrogen bonds, live GC content, mRNA transcription and protein translation. Includes a mutation ...

Simulate frequency shifts and wavefront compression for acoustic sound waves and relativistic light redshift ($z$). Features real-time wavefront propagation canvas and Web Audio tone simulation.

Simulate non-linear Hamiltonian chaos via Lagrangian mechanics solved with 4th-Order Runge-Kutta (RK4). Track sensitive dependence on initial conditions (Butterfly Effect) with an overlaid $0.001$ ...

Quantum optics delayed-choice experiment. Observe wave interference, wavefunction collapse via which-way detectors, and quantum erasure recovery.

Size earthing conductors for fault protection. For qualified electricians — always verify with local regulations.

Move past vague carbon guilt. PlanetPositive pinpoints the exact 80/20 high-leverage lifestyle actions that slash personal emissions the fastest while saving hundreds of pounds each year.

🔬 A comprehensive suite of ecological calculations for researchers, environmental scientists, and conservation professionals. Includes statistical analysis, biodiversity metrics, and ecosystem mod...

Interactive body systems — click organs and systems to learn their functions, facts, and connections

Compare countries by population, area, GDP, and more — with animated bar charts and data cards

Paste a DNA or mRNA sequence and watch it get transcribed and translated into amino acids — with a visual codon table

Explore all 118 elements — search by name, symbol or number, then click any element for detailed properties, electron configuration, discovery history and curator notes

Answer a few questions about your rock and get an identification — with visual examples and properties

Create beautiful visual timelines — add events, see them plotted chronologically with color-coded categories

Place point charges in 3D space and watch Coulomb field lines trace themselves from + to −. Includes a potential heat-map plane, a movable probe that gives the exact field E, potential V and force ...

Global electrical standards reference (IEC, NEC, BS): wiring, protection and installation rules. For qualified electricians and engineers.

🔬 A comprehensive electrical engineering toolkit for professionals and students. Includes circuit analysis, power calculations, and energy conversions with real-world context.

Watch light travel as perpendicular E and B fields in 3D. Dial in linear, circular or elliptical polarization, send it through a polarizer to verify Malus's law, and convert between wavelength, fre...

Calculate electricity costs, carbon footprint, and savings potential for any appliance. Track your energy usage and find ways to save money!

Calculate environmental impacts, explore sustainability metrics, and learn fascinating facts about Earth's systems. Make informed decisions for a greener planet!

Watch AI creatures evolve to walk, survive disasters, find food, and adapt! 10 terrain types, random events, food chains, achievements, and deep genetics. Creatures improve through natural selection.

Generate creative, hands-on science experiment ideas for all ages. Perfect for students, teachers, and curious minds!

Simulate Michael Faraday's 1831 parametric liquid surface waves ($\omega^2 = [gk + \frac{\sigma}{\rho}k^3]\tanh kh$). Observe subharmonic resonance ($f_{wave} = f_0/2$) and pattern transitions acro...

Convert height between feet+inches, centimetres and metres. Uses the international inch (exactly 25.4 mm). Edit any box — the others update.

Rosensweig normal-field magnetic instability simulator. Superparamagnetic liquid self-organizes into conical spikes balancing surface tension and magnetic stress.

Total internal reflection fiber optics lab. Explore critical angle guidance, acceptance cone numerical aperture (NA), and macro-bending radiation loss.

A chimney is an engine: hot gas inside, cold air outside, and the density difference pulls the fire along. This works out how much draught your flue actually generates, how fast the gas moves, how ...

Calculate the dimensionless Reynolds number ($\text{Re} = \frac{\rho v D}{\mu}$) for internal pipe flow and aerodynamics. Visualize laminar streamline transitions into chaotic turbulent vortices.

Aerodynamic wind tunnel museum exhibit. Visualize laminar airflow, von Kármán vortex shedding, and lift/drag forces around aerodynamic obstacles.

Léon Foucault's 1851 Paris Panthéon experiment proving Earth's diurnal rotation. The swing plane stays fixed in inertial space while Earth rotates below.

Synthesize planar four-bar kinematic mechanisms. Classify via Grashof's Theorem ($s + l \le p + q$), trace coupler curves (Chebyshev, Watt, Hoeken), and analyze transmission angles.

UK pint is 568 ml; US pint is 473 ml. UK gallon is 4.54609 L; US gallon is 3.78541 L. Edit any box — the others follow using the same liquid volume. Cooking cups are a different mess.

Explore genetics through interactive simulations, DNA analysis tools, and educational content. Perfect for students and enthusiasts!

Type or click out a boundary and get its true area on the curved Earth using the spherical-excess formula — the same maths GIS packages use — alongside the flat-map answer so you can see exactly ho...

Learn 40 countries with flip flashcards, then test yourself on capitals and flags. Streaks, scoring and fun facts make world geography stick.

Add countries, capitals, and notes to build your geography study list.

Explore geology concepts and discover fascinating facts about Earth's structure and processes.

General Relativity astrophysics exhibit. Drag a supermassive Schwarzschild black hole across cosmic starfields to observe Einstein rings and photon deflection.

Gravitational N-body astrophysical simulation. Watch two disk galaxies collide as differential tidal forces eject long parabolic stellar bridges and tails.

Why does a London–Tokyo flight arc over Siberia? Compute the true shortest path between any two points — Vincenty distance on the real ellipsoid, initial and final bearings, waypoints along the way...

Sunlight arrives easily, but the infrared Earth re-radiates gets intercepted by greenhouse gases. Watch photons battle through the atmosphere and see why the surface must warm until the books balance.

Explore rigid body rotational mechanics ($\boldsymbol{\tau} = \boldsymbol{\Omega}_p \times \mathbf{L}$). Calculate steady precession velocity ($\Omega_p = \frac{mgr}{I_z \omega_s}$), nutation frequ...

NWS Rothfusz heat index from shade air temperature and relative humidity. Officially for ≥ 27 °C. Full sun can feel several degrees worse. Not medical advice — heatstroke is an emergency.

Built on Naismith's Rule, the estimate mountain rescue has used for a century: allow an hour for every 5 km, plus a minute for every 10 m climbed. Then it adds the two things that actually decide w...

How far can you actually see, and how much of that distant hill, ship or radio mast is hidden behind the bulge of the Earth? Enter two heights and a distance and get the geometric answer, the refra...

Convert mechanical horsepower, metric PS and kilowatts, and compute power from torque × RPM. 1 hp = 745.7 W; 1 PS = 735.5 W. Power (kW) = torque (N·m) × RPM / 9549.

See the real quantum wavefunctions of hydrogen as glowing 3D probability clouds sampled from |ψ|², coloured by phase. Pick n, l and m, slice the cloud to reveal nodes, and calculate the energy, mea...

Professional inductance calculator with real-time visualization, multiple coil types, and comprehensive electrical analysis.

Essential for solar/off-grid setups: Calculate the right inverter size for your needs. Always consult a professional before installation!

Atmospheric fluid shear-flow instability. Two fluid layers with differing densities and velocities roll up into breaking ocean-billow cloud vortices.

10 safe, spectacular experiments using stuff already in your kitchen — each with step-by-step instructions, the real science explained, and safety notes. Perfect for curious kids and parents.

One knot is one nautical mile per hour. A nautical mile is exactly 1,852 m, so 1 kn = 1.852 km/h ≈ 1.15078 mph. Used by ships, aircraft and marine forecasts.

Type in twelve monthly temperatures and rainfall totals and this runs the full Köppen–Geiger decision tree on them — the same classification used on every climate map — showing not just the code (C...

Plan lab experiments by organizing materials, steps, and timing. Enter details and generate a structured plan.

Review lab safety rules and generate reminders for safe scientific work.

R = (supply − LED Vf) / current. Typical Vf: red ~1.8–2.2 V, green/blue/white ~3.0–3.4 V. Always put a resistor in series with a bare LED on a voltage source — the LED will not self-limit.

Rough incandescent, halogen and CFL wattage versus LED lumens. Packaging lumens win over “60 W equivalent” marketing. Efficacy defaults to typical household LEDs (~90 lm/W).

Professional lighting design calculator with comprehensive room analysis, fixture selection, and energy efficiency recommendations. ⚠️ Educational tool — consult certified lighting designers for ac...

Follow a flash from charge separation to thunder: colliding ice makes charge, a stepped leader feels its way down, a streamer connects, and a 30,000 A return stroke heats the air hotter than the Su...

Dual-galvanometer laser projector simulating orthogonal harmonic oscillations, phase shifts, and phosphorescent persistence curves.

🔧 Professional-grade calculations: Calculate electrical loads for homes, offices, or circuits. Includes NEC compliance tips and safety warnings.

Simulate fundamental boolean logic gates (AND, OR, XOR, NAND) and digital circuits with live voltage probes and dynamic truth tables.

Fire an electron, proton or ion into electric and magnetic fields and watch F = q(E + v × B) carve glowing 3D paths — cyclotron circles, helices, E×B drift and magnetic-mirror style spirals. Get th...

Lux = lumens ÷ area (m²) when light is spread evenly. A 800 lm bulb over a 10 m² desk is 80 lux — offices often want 300–500 lux. Beam angle and bounce are ignored.

Type-II high-temperature superconductor cryogenic lab. Explore Meissner effect magnetic field expulsion and quantum flux pinning levitation.

Calculate material properties and explore fascinating facts about metals, polymers, and composites. Uses real material properties from established databases.

Explore melting points of hundreds of substances. Compare materials, convert units, and learn about phase changes.

In standard materials, the refractive index is always positive ($n > 0$). But engineered metamaterials achieve negative permittivity ($\epsilon < 0$) and permeability ($\mu < 0$), reversing Snell's...

Calculate essential microbiology values and explore fascinating facts about the invisible world of microbes. 🧫 Growth rates • Dilutions • Microbial facts • Educational insights

Kinetic optical interference exhibit. Overlay geometric optical gratings and rotate them to observe emergent macro-scale moiré superlattices.

Eleven molecules and crystals as true ball-and-stick 3D — from water to a salt lattice to a diamond unit cell. Bonds are detected automatically from atomic distances, double/triple bonds included. ...

The site's own map, right here in the card. Drop two points — a town name, a coordinate pair, a Plus Code, a UK grid reference, a UTM coordinate, a Maidenhead locator or a geohash — and get the geo...

Calculate motor running/starting currents, cable sizing, protection devices, and voltage drop analysis for electrical installations. 🔧 Running current • Starting current • Cable sizing • Protectio...

The single-celled organism Physarum polycephalum (slime mold) and fungal mycelium have no brain or neurons, yet they solve complex mathematical mazes, Steiner tree networks, and traveling salespers...

Learn to spot 24 common UK/European plants and fungi from the features that actually matter in the field — leaf shape, flower colour, stem, habitat, season and a safety-relevant lookalike. Three mo...

Conservation of momentum and kinetic energy exhibit. Demonstrates compressive acoustic stress wave transmission across elastic collision chains.

Water in a swell doesn't travel — each parcel runs in a circle while the wave shape races on. Watch the orbit shrink with depth, then shallow the water until orbits squash and the wave breaks.

Instant voltage, current, resistance, and power calculations.

John Scott Russell's 1834 hydrodynamic flume exhibit. Simulates the Korteweg–de Vries (KdV) equation where nonlinear steepening balances dispersion to form permanent solitons.

Calculate optical properties, simulate light behavior, and explore fascinating physics of light.

Arthur Ashkin's 2018 Nobel Prize optical trap. Focused Gaussian laser beam gradient forces trap micro-particles and counter thermal Brownian diffusion.

Calculate orbital velocity, Keplerian period, and gravitational escape speed around celestial bodies. Analyze Low Earth Orbit, GPS altitudes, and Geostationary synchronization.

Visualize and analyze waveforms in real-time. Generate signals, adjust parameters, and explore waveforms.

Estimate minimum PCB trace width for a given current, copper thickness, and temperature rise.

Kinetic museum wave array. Independent pendulums with calibrated lengths execute serpentine traveling waves, choreographing standing waves and unified reconstitution.

Four things photographers work out in their heads and get wrong under pressure: what shutter speed balances a change of aperture, how long an ND filter needs, how much of the frame is actually shar...

Calculate electromagnetic photon energy ($E = h\nu = hc/\lambda$), momentum ($p = h/\lambda$), and matter wave de Broglie wavelengths across the entire electromagnetic radiation spectrum.

Zoom into a leaf: light hits chloroplasts, CO₂ slips in through stomata, water arrives from the roots — and sugars plus the oxygen you're breathing come out. Drive it with light and CO₂ and find th...

High-precision bidirectional converter across engineering, data storage, scientific physics, and everyday measurements.

Calculate common physics formulas: motion, forces, energy, and more. Select a formula to begin.

Comprehensive plant database with real-time data from multiple sources. Search for any plant to get detailed information.

Four boundary types, four very different landscapes: spreading ridges, subduction volcanoes, Himalaya-scale collisions and stick-slip transform faults — with earthquakes and mantle convection drivi...

Transparent plastics and tempered glass appear perfectly clear to our eyes, yet conceal massive internal structural stresses. When placed between crossed polarizers, anisotropic stress splits light...

Calculate electrical power values with multiple calculation modes. ⚠️ Educational purposes only — consult licensed electrician for actual installations.

Interactive optical bench simulating chromatic dispersion, Snell's law refraction, and total internal reflection (TIR) through a triangular prism.

Simulate parabolic ballistic trajectories in real time across different planetary gravitational fields. Computes flight time, apex altitude, total ground range, and impact velocity.

Unlike a classical binary bit (which is strictly 0 or 1), a quantum qubit exists as a continuous vector pointing anywhere on the 3D Bloch Sphere. Apply quantum gates ($H$, $X$, $Z$, $S$), observe c...

According to classical physics, the Sun should not shine! Its core temperature (15 million Kelvin) provides only ~1 keV of kinetic energy—ten times too weak to overcome the 1,000 keV electrostatic ...

Quantum mechanical wavepacket simulator solving the time-dependent Schrödinger equation across an impenetrable classical potential barrier.

Model exponential nuclear decay, remaining isotope fractions, and radiometric carbon dating via the fundamental decay law $N(t) = N_0 (1/2)^{t / t_{1/2}}$.

A real ray trace: sunlight enters a raindrop, bends (refracts), bounces once (or twice) off the back, and comes back at ~42° — split into colours because each wavelength bends a different amount.

τ = R × C. A capacitor charges to ~63% in one τ and ~99% in 5τ. Cut-off of a first-order RC low-pass is fc = 1 / (2πRC). R in ohms, C in farads (enter µF).

Alan Turing's 1952 morphogenesis simulator. Nonlinear chemical reaction-diffusion equations generating biological spots, stripes, and coral textures.

We live in 3 spatial dimensions — but why 3? Explore what life would be like in 1D, 2D, 4D, and beyond. Each dimension changes the laws of physics.

Watch Conway's Game of Life: 4 simple rules create self-replicating patterns, computation, and open-ended complexity from nothing.

Why does time only flow forward? Watch entropy increase in real-time as ordered systems dissolve into disorder — the fundamental law that gives time its direction.

The universe is governed by a handful of numbers. Change any one of them slightly — and atoms, stars, chemistry, and life cannot exist. Why these numbers?

Does observation change reality? Explore the measurement problem, Schrödinger's cat, and the role of the observer in quantum mechanics.

Explore wave-particle duality, superposition, and the measurement problem. Fire particles through slits and watch reality behave impossibly.

Zoom from the Planck length (10⁻³⁵m) to the observable universe (10²⁷m). Drag the slider to see where you exist in the full scale of reality.

See how mass warps the fabric of spacetime. Drag the mass slider to watch gravity bend space, slow time, and curve the paths of light.

From the Big Bang to the heat death of the universe. Slide through 13.8 billion years of cosmic history and see how reality unfolded.

The hardest problem in science. Explore the mystery of subjective experience — how does matter become aware? Interactive exploration of the leading theories.

The deepest question philosophy has ever asked. Explore the mystery of existence itself — why does anything exist at all?

Decode resistor color bands into resistance values. ⚠️ Educational only — verify with multimeter.

Will the link work? Radio needs more than line of sight — it needs a clear ellipse of space around the beam, and the Earth quietly bulges up into it. This adds up every gain and loss in the chain, ...

August Toepler's 1864 Schlieren photography system. Visualizes invisible thermal convection plumes and supersonic shockwaves via refractive index gradients.

Generate science quiz questions and test your knowledge with fun facts.

Build your science study list. Add topics and notes, then test yourself by hiding the notes. Saved locally in your browser.

Work through the scientific method. Enter your experiment idea and generate a structured outline.

Investigate ocean physics and the thermodynamic equation of seawater (TEOS-10). Calculate in-situ density ($\rho$), freezing point depression ($-1.91^\circ\text{C}$), sound speed ($c$), and thermoh...

Predict germination time based on seed type, temperature, and environmental factors using USDA, UC Davis, and university research data. This tool is supported by user contributions .

Soil pH and type determine nutrient availability and plant success. Match plants with their preferred conditions. This tool is supported by user contributions .

Estimate solar panel requirements for your energy needs. Educational tool only — always consult a professional installer.

Interactive 2D simulation of the Solar System. Adjust time speed and scale, toggle orbits and labels, click planets for details.

Calculate sound pressure level (SPL dB) drop over distance using the acoustic inverse-square law $L_2 = L_1 - 20\log_{10}(r_2/r_1)$, acoustic pressure in Pascals, and NIOSH/OSHA safe daily exposure...

Series adds ohms; parallel is the reciprocal sum. Never present an amp with a lower load than it is rated for — that is how output stages die. Passive crossovers are not modelled.

Calculate relativistic time dilation, length contraction, and kinetic energy via Einstein's Special Relativity equations. Compare spaceship crew time against stationary observer time.

Yoshiki Kuramoto's nonlinear synchronization model. Independent bioluminescent fireflies spontaneously phase-lock into simultaneous collective pulsing.

One substance, three behaviours: a vibrating lattice (ice), molecules that slide but stick (water), and a fast free-for-all (steam). Drag the temperature and watch the same particles reorganise — w...

Industrial steam table thermodynamics (IAPWS formulation). Calculate saturation pressure ($P_{sat}$), specific enthalpy ($h$), entropy ($s$), specific volume ($v$), and latent heat ($h_{fg}$) for s...

In classical engineering, noise is the enemy. But in non-linear physics and sensory biology, Stochastic Resonance proves that adding the exact right amount of random noise allows a sub-threshold, i...

Convert body weight between stone & pounds, pounds, kilograms and grams. One stone is 14 lb; one avoirdupois pound is exactly 0.45359237 kg.

Calculate IPv4 subnets, network boundaries, usable host ranges, and binary bit allocation. Essential for cloud VPCs, DevOps, and network routing.

Close-enough tap drill ≈ major diameter − pitch (75% thread). Metric coarse plus a few UNC sizes. For production work use the machinist’s table for your material.

The ground under you is moving right now. Pick a place and its tectonic plate and this rotates it about the plate's Euler pole — the real way plate motion is described — to give the present-day spe...

Calculate heat transfer, efficiency, entropy, and explore thermodynamics principles. Essential tool for physics, engineering, and chemistry.

Two kinds of people watch the tide: sailors who need enough water under the keel, and everyone crossing a causeway, ford or sandbar who needs the water gone. Give it one high water and one low wate...

Albert Einstein derived special relativity with an astonishingly simple thought experiment: a "light clock" bouncing a photon between two mirrors. Because the speed of light $c$ is constant for all...

Calculate torsional stiffness ($k_t = \frac{GJ}{L}$), natural angular frequencies ($\omega_n = \sqrt{k_t/I}$), and critical whirling RPM. Analyze engine harmonic orders ($1\times, 2\times, 3\times,...

Simulate the theoretical physics of the triangular TR-3B aerospace platform. Calculates Mercury-based Magnetic Field Disruptor (MFD) plasma acceleration, inertial mass reduction percentage, and sup...

Estimate transformer size for electrical loads. ⚠️ EDUCATIONAL ONLY — Always verify with a qualified engineer and local standards.

Investigate acoustic wave mechanics in water. Calculate high-precision sound velocity ($c \approx 1,482\text{ m/s}$, 4.3× faster than air), bulk modulus incompressibility ($K_s = \rho c^2 \approx 2...

Convert length, area, mass, and temperature without hunting for formulas.

Convert between common scientific and everyday units — length, mass, temperature, energy and pressure. Runs entirely in your browser.

Six of the universe's deepest mysteries run live as geometry: three-body chaos, curved spacetime & black-hole lensing, the centreless expansion, the golden angle, emergent life and fractal infinity.

Electrostatic museum exhibit. Rubber belt triboelectric charge transport accumulates up to 400 kV on the metal dome, firing high-voltage atmospheric sparks.

Design mechanical vibration isolators and shock mounts using force transmissibility ($T_R$). Calculate required static deflection ($\delta_{st}$), isolation efficiency ($\eta$), and operating frequ...

Vout = Vin × R2 / (R1 + R2). R1 is the top resistor from the supply; R2 is the bottom resistor to ground. Unloaded — a low-impedance load pulls the output down.

Estimate voltage drop across a conductor run. Educational only — always verify with a qualified electrician and local standards.

Watch Earth's water engine run: the Sun lifts water from the ocean as vapour, clouds build, rain falls, and every drop finds its way back to the sea. Step through the four stages or let it flow.

Investigate water's famous thermodynamic density anomaly ($\rho_{max}$ at $3.98^\circ\text{C}$). Explore negative thermal expansion, the $+9\%$ ice phase transition volume expansion, and ecological...

Investigate water's molecular dipole moment ($\mu = 1.854\text{ Debye}$) and huge dielectric permittivity ($\epsilon_r \approx 80.1$). Model Debye relaxation ($\epsilon^*(\omega) = \epsilon_\infty ...

Assess water hardness and mineral stability using the Langelier Saturation Index ($\text{LSI} = \text{pH} - \text{pH}_s$) and Ryznar Stability Index ($\text{RSI}$). Predict calcium carbonate precip...

Investigate water's auto-protolysis equilibrium ($2\text{H}_2\text{O} \rightleftharpoons \text{H}_3\text{O}^+ + \text{OH}^-$). Discover why neutral water is $\text{pH } 7.00$ only at $25^\circ\text...

Navigate water's complete thermodynamic $P$-$T$ phase space across Solid, Liquid, Vapor, and Supercritical regimes. Explore the Triple Point ($0.01^\circ\text{C}, 611.65\text{ Pa}$), Critical Point...

Explore water's extraordinary cohesive hydrogen-bond surface tension ($\sigma = 72.86\text{ mN/m}$). Calculate Jurin's Law capillary rise ($h = \frac{2\sigma\cos\theta}{\rho g r}$) and Young-Laplac...

Spoke length is a three-dimensional problem: the spoke runs from a hole in the hub flange, sideways to the rim centreline and around by however many crossings you lace. Get it wrong by two millimet...

Air molecules scatter sunlight in every direction — and short wavelengths scatter about 4× more than long ones. Slide the Sun down and watch the same physics hand the sky back as a sunset.

NWS/JAG/TI wind-chill (2001): valid when air is ≤ 10 °C and wind ≥ 4.8 km/h. It estimates how cold exposed skin feels — not a frostbite timer, and not for indoor fans.

Air is a moving floor. Point the nose where you want to go and the wind quietly carries you somewhere else, so every navigation log starts with the same triangle. This solves it exactly — heading t...

Waves are built by three things: how hard the wind blows, how far it blows over open water, and how long it keeps blowing. This works out which of the three is holding your sea state back, using th...

Professional wire sizing calculator for electrical installations with NEC/IEC compliance checks and safety recommendations.

An interactive world map with all 195 countries (UN members + observers) — every marker is a capital city. Explore flags, capitals and continents, then quiz yourself three ways: find the country on...