Energy Converter

1. Type any value. Enter a number in any unit field. All 8 units update simultaneously with no button to press.
2. Choose your starting unit freely. Need to convert BTUs to kilowatt-hours? Type in the BTU field. Converting food calories to joules? Type in the kcal field. Any field can be your input.
3. Read all conversions at once. Every unit shows its equivalent value, so you can compare joules, kilocalories, and BTUs side by side.
4. Note on calories. The small calorie (cal) is used in chemistry and physics. The kilocalorie (kcal) is what nutrition labels call a "Calorie" with a capital C. 1 food Calorie = 1 kcal = 1,000 cal.

Example: a typical slice of bread has about 79 kcal. Type 79 in the Kilocalorie field to see: 330,736 J, 330.736 kJ, 79,000 cal, 0.091871 kWh, 313.44 BTU.

All conversions use joules (J) as the base unit:

Value in joules = Input × toJoules factor
Result in target unit = Value in joules ÷ toJoules factor

Key relationship: 1 kWh = 3.6 MJ = 3,412.14 BTU. This is useful for electricity billing comparisons. The electronvolt is the energy unit of particle physics, representing the energy gained by one electron moving through a 1-volt potential difference.