Energy Converter

Convert between different units of energy

From

✨ Energy Converter

Convert between different units of energy. No data leaves your browser – every conversion happens locally.

Common energy conversions

1 kWh → J

= 3,600,000 J

1 calorie

= 4.184 J

1 kcal

= 4,184 J

1 BTU

= 1,055 J

1 kWh → kcal

= 860 kcal

Good to know

Calories on food labels are kilocalories. When a food label says '200 calories', it means 200 kcal (kilocalories) = 200,000 small calories. The small calorie (4.184 J) is used in chemistry. The food calorie is always the kilocalorie.

Frequently asked questions

1 kcal = 1,000 cal. Food labels use kcal but call them 'Calories' (capital C). So '100 Calories' on a food label = 100 kcal = 418,400 small calories.

3,600,000 J (3.6 MJ). A kWh is the energy used by a 1,000-watt device running for one hour.

British Thermal Unit — the energy needed to raise 1 pound of water by 1°F. Used for air conditioners, heaters, and boilers in the US. 1 BTU = 1,055 joules.

Report an Issue

Found a problem with Unit Converter? Let us know.

Your feedback helps us improve.

Please wait while we prepare your experience