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  <title>The Most Useful Site in the World</title>
  <link>https://www.themostusefulsiteintheworld.com/</link>
  <description>1164 free browser tools for developers, designers, students, and professionals. No sign-ups. No tracking. No ads. All offline-capable.</description>
  <language>en-gb</language>
  <managingEditor>hello@themostusefulsiteintheworld.com (Russell Head)</managingEditor>
  <webMaster>hello@themostusefulsiteintheworld.com (Russell Head)</webMaster>
  <lastBuildDate>Wed, 02 Sep 2026 00:00:00 +0000</lastBuildDate>
  <pubDate>Wed, 02 Sep 2026 00:00:00 +0000</pubDate>
  <ttl>1440</ttl>
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  <copyright>CC-BY 4.0 — Russell Head, Luton UK</copyright>
  <category>tools</category>
  <category>utilities</category>
  <category>free</category>
  <category>calculators</category>

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    <title>How mortgage payments really work — and what the bank's calculator doesn't show you</title>
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    <pubDate>Wed, 02 Sep 2026 00:00:00 +0000</pubDate>
    <description><![CDATA[A practical, math-honest guide to how mortgage payments are calculated, what the standard formula misses, and how to think about overpayments, term changes, and total interest paid. Includes the one number the bank's calculator never shows you in the summary box.]]></description>
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    <title>What BMI actually measures — and why your doctor still uses it</title>
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    <pubDate>Wed, 02 Sep 2026 00:00:00 +0000</pubDate>
    <description><![CDATA[A practical guide to what BMI is, what it isn't, why it survives as a population screening tool despite being useless for individuals, and what to use instead. Includes the three specific cases where BMI misleads, and the four better metrics in rough order of cost.]]></description>
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    <title>Why compound interest is magic — and why the line goes up, not straight</title>
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    <pubDate>Wed, 02 Sep 2026 00:00:00 +0000</pubDate>
    <description><![CDATA[A practical, honest guide to how compound growth works in real portfolios and real savings. Why the line is a curve, what the 8th duplicate of your money looks like, and when compound interest works against you. Includes the rule of 72 and the one counter-intuitive result that explains why the early saver always wins.]]></description>
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    <title>10 new tools added after auditing the catalogue</title>
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    <pubDate>Wed, 02 Sep 2026 00:00:00 +0000</pubDate>
    <description><![CDATA[Ten new free browser tools covering gaps found in a full audit: Hike Time Planner, Bike Gear Calculator, Photo Exposure Lab, Race Pace Predictor, Baby Sleep Planner, Energy Tariff Comparator, Unit Price Comparator, Fluid Type Scale, Fabric Yardage Estimator, Car Care Tracker.]]></description>
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    <title>The catalogue just hit 1164 free tools across 23 categories</title>
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    <pubDate>Wed, 02 Sep 2026 00:00:00 +0000</pubDate>
    <description><![CDATA[From mortgage calculators to a black-hole ray tracer, the catalogue now has 1164 self-contained browser tools. No sign-ups, no tracking, no ads. Read about the full structure on the home page.]]></description>
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    <title>New Help &amp; FAQ page — answers to the 12 most-asked questions</title>
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    <pubDate>Wed, 02 Sep 2026 00:00:00 +0000</pubDate>
    <description><![CDATA[Privacy, sharing, embedding, the Toolbox, requesting tools, troubleshooting — the things people ask most often, with honest answers.]]></description>
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    <title>Popular tools — 60 picks, hand-curated</title>
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    <pubDate>Wed, 02 Sep 2026 00:00:00 +0000</pubDate>
    <description><![CDATA[Sixty of the most-used tools on the site, grouped by category: calculators, converters, developer utilities, writing, music, health, design, and a few delightful science surprises.]]></description>
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    <title>Embed any tool on your own site</title>
    <link>https://www.themostusefulsiteintheworld.com/embed.html</link>
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    <pubDate>Wed, 02 Sep 2026 00:00:00 +0000</pubDate>
    <description><![CDATA[Every tool embeddable in one iframe. No JavaScript, no API key, no sign-up. Copy the snippet and paste it anywhere.]]></description>
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