QuickFreeTools

Online Energy Calculator

Convert between joules (J), kilowatt-hours (kWh), calories (cal), and BTU. Common energy units. Client-side only.

Frequently Asked Questions

What units are supported?
Joules (J), kilowatt-hours (kWh), kilocalories (kcal), and BTU (British thermal units). Enter a value in one unit and see equivalents in others.
What is the relation between J and kWh?
1 kWh = 3.6 million joules (3.6 × 10⁶ J). So 1 J = 1/3600000 kWh.

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