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Energy Converter

Convert energy units for electricity, nutrition, heating, physics, appliances, and engineering work.

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Kwh to Joulesjoules = kilowatt-hours x 3,600,000 Joules to Kilojouleskilojoules = joules / 1,000 Kilojoules to Joulesjoules = kilojoules x 1,000 Calories to Joulesjoules = calories x 4.184 Joules to Caloriescalories = joules / 4.184 Kcal to Caloriescalories = kilocalories x 1,000 Calories to Kcalkilocalories = calories / 1,000 Watt Hours to Joulesjoules = watt-hours x 3,600 Joules to Watt Hourswatt-hours = joules / 3,600 Kwh to Watt Hourswatt-hours = kilowatt-hours x 1,000 Watt Hours to Kwhkilowatt-hours = watt-hours / 1,000 Btu to Joulesjoules = British thermal units x 1,055.05585262

What is the energy converter?

The energy converter is a collection of calculators for changing one energy unit into another. Convert energy units for electricity, nutrition, heating, physics, appliances, and engineering work.

Energy conversions are used for electricity bills, nutrition labels, batteries, heating systems, physics problems, and appliance energy ratings.

Available energy units

This category includes the following units:

Common energy use cases

Use this category when the same measurement appears in different unit systems, data sheets, calculators, reports, or regional conventions.

These short unit notes help readers choose the right starting unit before opening a specific conversion page.

Joule (J)

A joule is the SI unit of energy. It is used in physics, mechanics, electricity, heat, and scientific calculations.

Browse joules conversions

Kilojoule (kJ)

A kilojoule is equal to 1,000 joules. It is commonly used for food energy, heating, work, and engineering calculations.

Browse kilojoules conversions

Calorie (cal)

A calorie is an energy unit historically used for heat and nutrition. In technical contexts it is equal to 4.184 joules.

Browse calories conversions

Kilocalorie (kcal)

A kilocalorie is equal to 1,000 calories and is widely used on nutrition labels as a food Calorie.

Browse kcal conversions

Watt-hour (Wh)

A watt-hour is an energy unit that represents one watt of power used for one hour. It is common for batteries and small electrical loads.

Browse watt-hours conversions

Kilowatt-hour (kWh)

A kilowatt-hour is an energy unit used for electricity bills, appliance consumption, batteries, and power usage over time.

Browse kwh conversions

Common energy conversion mistakes

Most wrong answers come from mixing unit systems, rounding too early, or choosing a unit that looks similar but means something different.

Start with one of these common energy conversions:

Browse energy conversions by starting unit

Use these grouped links when you know the unit you are starting from and want to compare several destination units.

Joule conversions

Start with joules and convert to common energy units.

joules to kilojoules joules to calories joules to kcal joules to watt-hours joules to kwh joules to btu

Kilojoule conversions

Start with kilojoules and convert to common energy units.

kilojoules to joules kilojoules to calories kilojoules to kcal kilojoules to watt-hours kilojoules to kwh kilojoules to btu

Calorie conversions

Start with calories and convert to common energy units.

calories to joules calories to kilojoules calories to kcal calories to watt-hours calories to kwh calories to btu

Kilocalorie conversions

Start with kilocalories and convert to common energy units.

kcal to joules kcal to kilojoules kcal to calories kcal to watt-hours kcal to kwh kcal to btu

Watt-hour conversions

Start with watt-hours and convert to common energy units.

watt-hours to joules watt-hours to kilojoules watt-hours to calories watt-hours to kcal watt-hours to kwh watt-hours to btu

Kilowatt-hour conversions

Start with kilowatt-hours and convert to common energy units.

kwh to joules kwh to kilojoules kwh to calories kwh to kcal kwh to watt-hours kwh to btu

British Thermal Unit conversions

Start with British thermal units and convert to common energy units.

btu to joules btu to kilojoules btu to calories btu to kcal btu to watt-hours btu to kwh

All energy conversion pages

This complete index helps users and search engines discover every generated energy conversion page.

kwh to joules joules to kilojoules kilojoules to joules calories to joules joules to calories kcal to calories calories to kcal watt-hours to joules joules to watt-hours kwh to watt-hours watt-hours to kwh btu to joules joules to btu joules to kcal joules to kwh kilojoules to calories kilojoules to kcal kilojoules to watt-hours kilojoules to kwh kilojoules to btu calories to kilojoules calories to watt-hours calories to kwh calories to btu kcal to joules kcal to kilojoules kcal to watt-hours kcal to kwh kcal to btu watt-hours to kilojoules watt-hours to calories watt-hours to kcal watt-hours to btu kwh to kilojoules kwh to calories kwh to kcal kwh to btu btu to kilojoules btu to calories btu to kcal btu to watt-hours btu to kwh

Use these links to move between neighboring converter categories, hand-written unit references, popular units, and complete site indexes.

Unit Wiki and references

Unit WikiBrowse hand-written unit references

Complete indexes and tools

Complete energy indexEvery generated page in this category All converter categoriesGrouped site-wide converter directory Open the main converterSwitch between major categories quickly Request a unitSuggest missing units or categories

How energy conversion works

Energy conversions use a standard reference unit as the bridge between source and target units, so each page can show both the direct formula and practical examples.

How to use this converter

Enter a value, choose the units, and read the converted result immediately. Each dedicated conversion page also includes a formula, examples, a conversion table, related links, and FAQ.

FAQ

Which energy units are included?

This category includes joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, British thermal units and related units.

Are formulas included?

Yes. Individual conversion pages include formulas, manual steps, examples, and conversion tables.