Energy converter

Enter your energy and choose the units. The answer updates as you type.

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Energy converter processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

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Value

From

Converted value

Precision and other units

Decimals, fractions and scientific notation work here.

Significant digits

Send the displayed number to the notation converter in this tab. Units stay here.

Energy is a quantity, while power is a rate. Calories here are thermochemical; the Btu choice uses the international-table definition.

The same value in other units
Unit	Value

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Updated 2026-09-19

How to convert energy

Energy is a quantity, while power is a rate. Calories here are thermochemical; the Btu choice uses the international-table definition.

Multiply by the source unit factor to get the base quantity, then divide by the target factor. The other-units table compares the same value without retyping it.

Next: Power converter

A worked example

1 kilowatt-hour = 1000 watts × 3600 seconds = 3.6 megajoules.

Next: Force converter

Before you use the result

Displayed values are rounded; extra digits do not make your measurement more accurate. Energy is a quantity, while power is a rate. Calories here are thermochemical; the Btu choice uses the international-table definition.

Next: Torque converter

kilowatt-hours (kWh) to megajoules (MJ): reference values

kilowatt-hours (kWh)	megajoules (MJ)
1	3.6
10	36
100	360

Calculated with the same conversion as the tool above.

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ToolOctopus. “Energy converter.” Updated 2026-09-19. https://tooloctopus.com/energy-converter.

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