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Energy Converter

Convert joules, calories, watt-hours, and kilowatt-hours.

Value

From

How it works

Converts through joules. 1 calorie = 4.184 J, and food "Calories" are kilocalories.

Is this calculator free?

Yes. No signup is needed and nothing you enter is stored.

Is the result exact?

Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.

Do my numbers leave my device?

No. The calculation runs in your browser.