How does the energy converter work?

All energy units are stored relative to joules. The calculator converts your input to joules, then to the target unit, so calories, kilowatt-hours, and BTUs convert precisely.

How many calories are in a joule?

One calorie equals 4.184 joules. Note the distinction: a food Calorie (kcal) is 1,000 small calories, so 1 food Calorie equals about 4,184 joules.

What is a kilowatt-hour?

A kilowatt-hour (kWh) is the energy used by a 1,000-watt appliance running for one hour, equal to 3.6 million joules. It is the standard billing unit on electricity bills.

A BTU (British Thermal Unit) is the energy needed to raise one pound of water by one degree Fahrenheit, equal to about 1,055 joules. It is used in heating and air conditioning specifications.

How do I convert kWh to joules?

Multiply kWh by 3,600,000. For example, 1 kWh = 3.6 × 10⁶ J. This converter handles all the common energy units and their exact factors.

Energy Converter

Convert energy instantly between joules, kilojoules, calories, kilocalories, kilowatt-hours, and BTUs. Covers diet, physics, and electricity use cases.

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