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Free Energy
Converter

Advanced free energy converter for joules, kWh, BTU, calories, electronvolts, therms, TNT equivalents and battery/runtime calculations.

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About Free Energy Converter

Convert energy across practical and scientific units, compare every equivalent at once, estimate electricity cost, and model battery runtime — all locally in your browser.

Workspace options

  • Target unit
  • Load power
  • Power unit
  • Runtime (hours)
  • Price per kWh
  • Battery capacity (Wh)

Available actions

  • Export history
  • Converter
  • Cost & runtime
  • Reference
  • Copy result
  • Save history