FORMULA
How to convert
J = kWh × 3600000Example: 10 kWh = 36000000 J.
KWH → J
Kilowatt-Hours to Joules
Convert kilowatt-hours to joules with an exact, deterministic calculation.
LIVE CONVERSIONDECIMAL ENGINE EXACT_
1 kWh = 3600000 J
MULTI-CONVERT
QUICK ANSWER
1 Kilowatt-hour
3600000 J
REFERENCE TABLE
Kilowatt-hour to Joule
| kilowatt-hours | joules |
|---|---|
| 1 kWh | 3600000 J |
| 5 kWh | 18000000 J |
| 10 kWh | 36000000 J |
| 25 kWh | 90000000 J |
| 50 kWh | 180000000 J |
| 100 kWh | 360000000 J |
ABOUT THIS CONVERSION
Convert kilowatt-hours to joules
This page converts kilowatt-hours (kWh) to joules (J). Convertor4U first interprets the input using Kilowatt-hour's definition, then expresses the same quantity in Joule. The result is calculated from the stored factor and offset definitions, not from a rounded lookup table.
Real-world example
For comparing an electricity bill, battery capacity, food energy, or heating requirement, an input of 1 kWh converts to 3600000 J. Keep extra digits while calculating, then round only the final value to the precision the task actually needs.
Rounding and precision
Billing and nutrition should follow the precision of the original label. Scientific work should preserve significant figures. Small electronvolt values converted to joules may be clearer in scientific notation.
Regional context
Food labels may write 'Calories' with a capital C to mean kilocalories. Kilojoules are prominent on labels in many countries, while food Calories are common in the United States. BTU conventions can vary slightly; this site states its stored factor.
Common mistake
Power and energy are different: kilowatts measure a rate, while kilowatt-hours measure an amount of energy.
Editorial method
Definitions and sources are listed below. Calculations retain more precision than the default display and round only for presentation.
USEFUL ANSWERS
kWh to J FAQs
How do I convert kilowatt-hours to joules?
Enter the kWh value in the calculator. It applies the stored factor and offset definitions and returns the equivalent in J; the formula and common-value table are shown on this page.
Is the kWh to J conversion exact?
Defined measurement relationships are calculated with decimal arithmetic from stored standards. The displayed answer may be rounded for readability. Currency results instead depend on the dated reference rate shown.
How many decimal places should I keep?
Billing and nutrition should follow the precision of the original label. Scientific work should preserve significant figures. Small electronvolt values converted to joules may be clearer in scientific notation.
What should I check before using the result?
Power and energy are different: kilowatts measure a rate, while kilowatt-hours measure an amount of energy.
FROM UNIT
Kilowatt-hour
The kilowatt-hour (kWh) is an energy unit equal to exactly 3.6 megajoules. It measures energy, work, or heat rather than the rate of energy transfer.
NIST Guide to the SI, SP 811 ↗Definition verified 14 August 2026TO UNIT
Joule
The joule (J) is the SI unit of energy, equal to the work done by one newton through one meter. It measures energy, work, or heat rather than the rate of energy transfer.
NIST Guide to the SI, SP 811 ↗Definition verified 14 August 2026Content reviewed by Convertor4U Editorial Team · 16 August 2026 · Report an error on this page