Xoricon Toolbox LogoXoricon

Energy Converter

Instantly convert energy between joules, kilojoules, kWh, calories, BTUs, therms, electronvolts and more.

Use a comma or period as the decimal separator; do not use thousands separators.

All units

SI

Use as target unit: Microjoule
Microjoule (µJ)
3.6e12
Use as target unit: Millijoule
Millijoule (mJ)
3,600,000,000
Use as target unit: Joule
Joule (J)
To
3,600,000
Use as target unit: Kilojoule
Kilojoule (kJ)
3,600
Use as target unit: Megajoule
Megajoule (MJ)
3.6
Use as target unit: Gigajoule
Gigajoule (GJ)
0.0036

Electrical energy

Use as target unit: Milliwatt-hour
Milliwatt-hour (mWh)
1,000,000
Use as target unit: Watt-hour
Watt-hour (Wh)
1,000
Use as target unit: Kilowatt-hour
Kilowatt-hour (kWh)
From
1
Use as target unit: Megawatt-hour
Megawatt-hour (MWh)
0.001

Calories and food energy

Use as target unit: Thermochemical Calorie
Thermochemical Calorie (cal(th))
860,421
Use as target unit: International Table Calorie
International Table Calorie (cal(IT))
859,845
Use as target unit: Thermochemical Kilocalorie
Thermochemical Kilocalorie (kcal(th))
860.421
Use as target unit: Food Kilocalorie
Food Kilocalorie (kcal(IT))
859.845

BTU and therm

Use as target unit: Thermochemical British Thermal Unit
Thermochemical British Thermal Unit (BTU(th))
3,414.43
Use as target unit: British Thermal Unit (International Table)
British Thermal Unit (International Table) (BTU(IT))
3,412.14
Use as target unit: US Therm
US Therm (therm(US))
0.0341214

Mechanical and CGS units

Use as target unit: Erg
Erg (erg)
3.6e13
Use as target unit: Inch-pound Force
Inch-pound Force (in·lbf)
31,862,700
Use as target unit: Foot-pound Force
Foot-pound Force (ft·lbf)
2,655,220

Particle energy

Use as target unit: Electronvolt
Electronvolt (eV)
2.24694e25
Use as target unit: Kiloelectronvolt
Kiloelectronvolt (keV)
2.24694e22
Use as target unit: Megaelectronvolt
Megaelectronvolt (MeV)
2.24694e19
Use as target unit: Gigaelectronvolt
Gigaelectronvolt (GeV)
2.24694e16

Energy equivalents

Use as target unit: Ton of TNT Equivalent
Ton of TNT Equivalent (t TNT)
0.000860421
Use as target unit: Tonne of Oil Equivalent
Tonne of Oil Equivalent (toe)
0.0000859845
Reserved ad slot

Good to know

The Energy Converter converts energy units directly in your browser. It supports common units such as joules, kilojoules, calories, kilowatt-hours, BTU, and electronvolts and is useful for everyday tasks, school, studies, engineering, travel, shopping, planning, and quick plausibility checks.

Typical searches for this page include kWh to joules, calories to kilojoules, convert energy. Calculation runs locally in the browser, without upload or server processing. Nutrition calories, technical energy, and electricity costs have different contexts.

Typical use cases

Quick everyday conversion

Convert values for recipes, measurements, travel, online shopping, DIY work, or product specifications without opening a spreadsheet.

Compare technical values

Use the converter for technical documentation, data sheets, lab values, device settings, or international specifications.

Local calculation without tracking

Entered values stay in the browser. This is useful for drafts, internal calculations, and quick checks where no external service is needed.

Tips for better results

Check unit and rounding

Check the source unit and decide whether the rounded display is sufficient or whether more decimal places are useful.

Cross-check critical values

For legal, medical, safety-critical, or regulated measurement use, compare results with the applicable standard or measurement source.

How it works

Step by step

  1. 1

    Enter a value

    Enter the source value and choose the matching starting unit.

  2. 2

    Compare results

    Target values are calculated automatically and shown in the most important units.

  3. 3

    Use the value

    Copy the matching result into documentation, planning, orders, code, spreadsheets, or notes.

Features

Browser-based conversion

Calculation runs locally. Values are not sent to a server for conversion.

Multiple units at a glance

After input, matching target values are shown immediately in multiple units.

Flexible display

Options such as grouping, decimal places, or source unit help make results easy to review.

Frequently asked questions

Are inputs uploaded when using Energy Converter?

No. Conversion runs locally in the browser. Entered values are not transferred to Xoricon or another server.

How accurate is the conversion?

The converter uses standardized factors and JavaScript floating-point numbers. Displayed results are rounded and are not intended for regulated metrology or uncertainty calculations.

Can I see multiple units at once?

Yes. Many converters show several matching target values after one input, so you can quickly find the relevant unit.

More tools

Power Converter

Instantly convert power between watts, kilowatts, megawatts, metric and mechanical horsepower, BTU and refrigeration units.

Temperature Converter

Instantly convert temperatures between Celsius, Fahrenheit, kelvin, Rankine, and four historical scales.

Pressure Converter

Instantly convert pressure between pascals, kPa, MPa, bar, psi, atmospheres, torr, mercury and water-column units.