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Energy Converter

Convert between joules, calories, BTU, kWh, and other energy units.

Tips for Using This Calculator

• All calculations are performed instantly as you type

• Use the copy button to save your results

• Results are automatically shared in the URL for easy sharing

• This calculator works completely offline after loading

What's the difference between energy and power?

How many calories in a joule?

Power Converter

Convert between watts, horsepower, BTU/hour, and other power units.

BMR Calculator

Calculate your Basal Metabolic Rate to determine how many calories you burn at rest.

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin temperature scales instantly.

Last updated: 2/22/2026