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Unit Conversion & Everyday Life

Energy Converter

Convert energy between joules, kilowatt-hours, calories, kilocalories, BTU, electronvolts and foot-pounds.

Your inputs

Results

1 kWh in MJ

3.6 MJ

Conversion type
Exact (from defined constants; display rounded to 12 significant figures)
1 kWh =
3.6 MJ

✓Exact calculation — rounded only for display

1 kWh in all energy units14 rows
UnitValue
Joule (J)3,600,000
Kilojoule (kJ)3,600
Megajoule (MJ)3.6
Gigajoule (GJ)0.0036
Watt-hour (Wh)1,000
Kilowatt-hour (kWh)1
Megawatt-hour (MWh)0.001
Calorie (thermochemical) (cal)860,420.650096
Kilocalorie (food Calorie) (kcal)860.420650096
Calorie (International Table) (cal_IT)859,845.227859
British thermal unit (IT) (BTU)3,412.14163313
Foot-pound force (ft·lbf)2,655,223.7374
Electronvolt (eV)2.24694E25
Erg (erg)36,000,000,000,000

What this calculator does

Energy appears on electricity bills (kWh), food labels (kcal) and heating systems (BTU). This tool converts between them.

Formula and method

1 kWh = 3.6 MJ; 1 kcal (thermochemical) = 4184 J; 1 BTU (IT) = 1055.05585262 J; 1 eV = 1.602176634 × 10⁻¹⁹ J

Worked example

Calculated by this tool with its default inputs:

Inputs

  • Value: 1
  • From: Kilowatt-hour (kWh)
  • To: Megajoule (MJ)

Results

  • 1 kWh in MJ: 3.6 MJ
  • Conversion type: Exact (from defined constants; display rounded to 12 significant figures)
  • 1 kWh =: 3.6 MJ

How to read the results

Food “Calories” are kilocalories.

Assumptions and limitations

  • Thermochemical and International Table calories differ slightly; both are listed.
  • Constants follow NIST SP 811 and the SI Brochure. Conversions marked exact follow from defined values; display is rounded to 12 significant figures.

Questions

How many kcal in a kWh?

About 860.4.

Sources

Methodology and verification

Result type
Exact mathematical calculation (rounded only for display)
Formula version
1.0
Automated verification
8 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
Editorial review
Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.

Privacy

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