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About This Tool
Energy Converter converts between joules, kilojoules, calories, kilocalories (food calories), kilowatt-hours, BTU, and electronvolts. Energy units span physics (joule, eV), nutrition (kcal), utility billing (kWh), and HVAC engineering (BTU).
Food labels in different countries use calories or kilojoules interchangeably — 1 food calorie (kcal) equals 4.184 kJ. Getting that conversion wrong leads to significant errors in dietary tracking and energy balance calculations.
Tip: For electricity costs, work in kWh — your utility bill charges per kWh, not joules. One kWh equals 3,600,000 joules (3.6 MJ). Knowing this lets you calculate the energy cost of running any appliance from its wattage and usage hours.