# Energy converter

> Convert energy units with explicit calorie definitions.

[Open tool](https://www.toolcabana.com/lb/energy-converter) · [Units and measurement](https://www.toolcabana.com/lb/category/units-and-measurement)

Tool ID: energy-converter. Requested language: lb. Description language: en. Complete guide translation: no; untranslated sections use English.

## Overview (en)

The Energy converter takes an amount of energy and returns it in another unit, including joules, kilojoules, megajoules, watt-hours, kilowatt-hours, thermochemical calories and kilocalories, and IT British thermal units. A kilowatt-hour is 3,600,000 joules, a thermochemical calorie is 4.184 joules, and one BTU (IT) is 1,055.05585262 joules.

## Supported tasks (en)

Convert energy units with explicit calorie definitions.

## Steps (en)

1. Adjust the values; an initial result is calculated from the defaults.
2. Change the basic settings or open Advanced mode to fine-tune the result.
3. Review and copy or download your result. Pause Live results to run manually. Sources or individual settings above 20,000 characters require an explicit run.

## Settings

- Value (en; key: value; type: number)
- From (en; key: from; type: select): J [en], kJ [en], MJ [en], Wh [en], kWh [en], cal (thermochemical) [en], kcal (thermochemical) [en], BTU (IT) [en]
- To (en; key: to; type: select): J [en], kJ [en], MJ [en], Wh [en], kWh [en], cal (thermochemical) [en], kcal (thermochemical) [en], BTU (IT) [en]
- Significant digits (en; key: precision; type: number); minimum: 1; maximum: 15
- Number display (en; key: notation; type: select): Standard (grouped) [en], Plain (no grouping) [en], Scientific notation [en]

## Limitations (en)

Use finite numbers, valid dates and the ranges shown by each control. Invalid values produce an error without a downloadable result.

## Privacy and connections (en)

This operation processes its source in your browser. Copy and download are explicit actions; source input is not saved in an account or history.

## Questions (en)

### How many joules are in a kilowatt-hour?

A kilowatt-hour is 3,600,000 joules, because one watt for one hour is 3,600 joules and a kilowatt is 1,000 watts. A watt-hour is 3,600 joules.

### Which calorie does this converter use?

It uses the thermochemical calorie of exactly 4.184 joules, and the kilocalorie of 4,184 joules. Food labels usually list kilocalories, so 1 kcal from a label converts to 4.184 kJ here.

### How many BTU are in a kWh?

The converter uses the International Table BTU of 1,055.05585262 joules. Dividing 3,600,000 joules by that value gives about 3,412.14 BTU per kilowatt-hour.

### Where is my input processed?

This operation processes its source in your browser. Copy and download are explicit actions; source input is not saved in an account or history.

### What are the input limits?

Use finite numbers, valid dates and the ranges shown by each control. Invalid values produce an error without a downloadable result.

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