Authoritative definitions of the International System of Units and SI prefixes.
Unit conversion
Kilowatt-hours to Joules Converter
1 kWh = 3,600,000 J. Enter a value to convert kWh to J, then use the formula and table below. Displayed digits may be rounded.
Energy, work, heat & powerInstant result
Decimals
Formula result = input × 3600000 ÷ 1. 1 kWh = 3,600,000 J
Nonzero results too small for the selected decimal places use scientific notation.
Nonzero results too small for the selected decimal places use scientific notation.
Common examples
One value, several units
Joules3,600,000 J
Kilojoules3,600 kJ
Megajoules3.6 MJ
Watt-hours1,000 Wh
Thermochemical calories860,420.6501 cal
Kilocalories860.4207 kcal
BTU (International Table)3,412.1416 BTU
Conversion table
| kWh | J |
|---|---|
| 1 kWh | 3,600,000 J |
| 2 kWh | 7,200,000 J |
| 5 kWh | 18,000,000 J |
| 10 kWh | 36,000,000 J |
| 25 kWh | 90,000,000 J |
| 50 kWh | 180,000,000 J |
| 100 kWh | 360,000,000 J |
Conversion chart
1 kWh3,600,000 J
5 kWh18,000,000 J
10 kWh36,000,000 J
25 kWh90,000,000 J
50 kWh180,000,000 J
Worked example
1 kWh = 3,600,000 J. Apply the selected conversion formula to other input values.
Unit definition
Kilowatt-hours (kWh) One kilowatt-hours equals 3,600,000 joule.
Unit history
Kilowatt-hours is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert kWh to joule.
3. Convert the base value to J and apply your display precision.
Understand the result before using it
Kilowatt-hours to Joules converts a value measured in Kilowatt-hours (kWh) into the equivalent value in Joules (J). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 3600000 ÷ 1
Assumptions
- Kilowatt-hours and Joules represent the same energy, work & heat quantity.
- The input is expressed in kWh; the output is expressed in J.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 kWh = 3,600,000 J. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a kWh measurement in a document that expects J.
- Compare a kilowatt-hours value with a value reported in joules.
- Check the kWh to J arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse kWh with another unit that has a similar name or symbol.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Kilowatt-hours to Joules?
result = input × 3600000 ÷ 1. Input is in kWh; result is in J. 1 kWh = 3,600,000 J. The displayed digits may be rounded.
What is 1 kWh in J?
1 kWh = 3,600,000 J. The displayed digits may be rounded.
Can I reverse the kWh to J conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts J back to kWh.
Is the Kilowatt-hours to Joules result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.