# Energy Converter

> Convert energy between 9 units with the formula, a reverse conversion and a quick-reference table.

To convert energy, enter a value and pick the units. The result appears instantly with the exact conversion formula, the reverse conversion, a quick-reference table of common values and every one of the 9 supported units. The "calorie" on food labels is actually a kilocalorie — 4184 joules. Nutrition labels in the EU show both kcal and kJ.

**URL:** https://convertto.tech/t/energy-converter
**Category:** Unit Converters (https://convertto.tech/c/unit-converters)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Units supported:** 9
- **Base unit:** J
- **Precision:** Adjustable from 1 to 15 significant figures
- **Shows:** Formula, reverse conversion and a common-values table
- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Set the value.
2. Choose the from.
3. Choose the to.
4. Turn "Swap direction" on or off as needed.
5. Set the significant figures.
6. The result appears immediately — copy or download it.

## FAQ

### How accurate is this energy converter?

Conversions use exact SI definitions where one exists and are computed in double-precision floating point. You can raise the displayed precision to 15 significant figures, and the unrounded result is shown separately. The "calorie" on food labels is actually a kilocalorie — 4184 joules. Nutrition labels in the EU show both kcal and kJ.

### Can I reverse the conversion without retyping?

Yes — the swap toggle reverses the two units in place. The reverse rate is also shown in the detail section, so you can read it either way without changing anything.

### Is my data sent anywhere?

No. The conversion is plain JavaScript running in your browser. No value you type is transmitted, logged or stored.

### Can I link to a specific conversion?

Yes. The URL updates as you type, so you can bookmark or share a link that reopens with exactly the same conversion.

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