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⚡ Transformer Sizing Calculator

⚡ Transformer Sizing Calculator

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

Total power consumption in kilowatts
Line-to-line voltage for three-phase
Quality of electrical power (0.7-1.0)
Transformer efficiency percentage
Future expansion and safety buffer
🏭 Common Load Types

📊 Transformer Sizing Results

📚 Transformer Fundamentals
Formula (Three-phase): kVA = (√3 × V × I) / 1000
Formula (Single-phase): kVA = (V × I) / 1000
  • Transformer rating is expressed in kVA (kilovolt-amperes)
  • Power factor affects apparent power (kVA) vs real power (kW)
  • Efficiency accounts for transformer losses (copper + iron)
  • Always include safety margin for future expansion (10-30%)
  • Consider ambient temperature derating for installation
⚠️ Important Disclaimer:
This tool provides educational estimates only. Always consult with a licensed electrical engineer and comply with local electrical codes (IEC, NEC, etc.) before any installation. Actual sizing requires detailed load analysis, harmonics study, and protective device coordination.

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