Last updated: March 2, 2026 by Dr. David Park

How to Convert Between Energy Units

Formula

All energies are first converted to joules, then from joules to the target unit.

Energy conversion is fundamental in physics, engineering, nutrition, and utility billing. This converter handles all major energy units from the SI joule to practical units like kWh and BTU.

The joule is the SI unit of energy and serves as the base for all conversions.

Common use cases:

  • Comparing food calories to exercise energy expenditure
  • Converting electricity bills between kWh and joules
  • HVAC BTU calculations

Frequently Asked Questions

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Dr. David Park

Applied Mathematician, PhD Mathematics

David holds a PhD in Applied Mathematics from MIT. He has published research on numerical methods and computational algorithms used in engineering and scientific calculators.

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