Heat Converter

Convert heat and energy units: joules, calories, BTU, kWh and more.

Energy Input

Value Unit Decimal places

Results

Enter a heat or energy value to compare SI, food energy, electricity, HVAC, and mechanical work units.

J kJ cal kcal Wh kWh BTU Therms ft-lb hp-h

Reference

Electricity 1 kWh = 3,600,000 J = 3.6 MJ

Food energy 1 food Calorie is 1 kcal, which equals 4,184 J

Heating and HVAC 1 BTU = 1,055.05585262 J; 1 therm = 100,000 BTU

Tool Introduction

Use this heat and energy converter for utility bills, appliance estimates, nutrition labels, HVAC specs, lab calculations, and mechanical work. It converts between joules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, therms, foot-pounds, and horsepower-hours.

In everyday U.S. usage, BTU and therms are common for heating and natural gas, kWh is common for electricity, and Calories on food labels mean kilocalories. Scientific and engineering calculations usually use joules or kilojoules.