kilojoules to joules
Convert kilojoule to joule — instant, free, with the formula shown.
1 kJ=1000 J
How to convert kilojoule to joule
To convert kilojoule to joule, multiply by 1000:
J = kJ × 1000
For example, 10 kJ × 1000 = 10000 J.
kJ to J conversion table
| kilojoules (kJ) | joules (J) |
|---|---|
| 1 kJ | 1000 J |
| 2 kJ | 2000 J |
| 5 kJ | 5000 J |
| 10 kJ | 10000 J |
| 25 kJ | 25000 J |
| 50 kJ | 50000 J |
| 100 kJ | 100000 J |
| 250 kJ | 250000 J |
| 500 kJ | 500000 J |
| 1000 kJ | 1000000 J |
Other kilojoule conversions
Convert to joule from another unit
kJ to J — frequently asked
How many joules are in 1 kilojoule?
1 kilojoule = 1000 joules (kJ × 1000 = J).
What is the formula to convert kilojoule to joule?
Multiply your kilojoule value by 1000 to get joule.
How do I convert 10 kilojoules to joules?
10 kJ = 10000 J. For 100 kJ the answer is 100000 J. Use the calculator on this page for any other value.
When to convert kilojoule to joule
1Electricity bills (kWh)
2Nutrition labels (kcal / food cal)
3HVAC and heating (BTU, therms)
4Physics and chemistry (J, eV)
Energy conversion — common questions
Is a food calorie the same as a calorie?
No — a food 'Calorie' (capital C) actually means 1 kilocalorie = 1,000 small calories = 4,184 J. Nutrition labels typically write 'cal' meaning kcal.
How many joules in 1 kWh?
1 kWh = 3,600,000 J (3.6 MJ). Because 1 kW × 1 hour = 1,000 W × 3,600 s = 3,600,000 J.
What is a BTU?
British Thermal Unit — the energy required to raise 1 pound of water by 1 °F. 1 BTU ≈ 1,055 J.
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