⚡ Energy Converter
joules, calories, kWh and BTU
About this calculator
Joules, kilojoules, calories, kilocalories (food Calories), watt-hours, kilowatt-hours, and BTUs. Enter an energy value in any unit and see all equivalents. It bridges the gap between your electricity bill (kWh), your workout (kcal), and your furnace rating (BTU) — three worlds that rarely speak the same language. It also handles electronvolts for physics students and therms for natural gas billing.
Tip: 1 kWh equals 3,412 BTU — handy when comparing electric versus gas heating costs for your home.