Joules to Kilojoules
One joule is 0.001 kilojoules. Energy units for food, electricity and physics. The "calorie" on a nutrition label is a kilocalorie — 1,000 of the calories used in physics.
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1 joule = 0.001 kilojoules · open this conversion
Formula
kilojoules = joules × 0.001
A food Calorie (capital C) is a kilocalorie. The thermochemical calorie of 4.184 J is used here.
Joules to Kilojoules table
| Joules | Kilojoules |
|---|---|
| 1 J | 0.001 kJ |
| 2 J | 0.002 kJ |
| 5 J | 0.005 kJ |
| 10 J | 0.01 kJ |
| 20 J | 0.02 kJ |
| 25 J | 0.025 kJ |
| 50 J | 0.05 kJ |
| 100 J | 0.1 kJ |
| 150 J | 0.15 kJ |
| 200 J | 0.2 kJ |
| 250 J | 0.25 kJ |
| 300 J | 0.3 kJ |
| 400 J | 0.4 kJ |
| 500 J | 0.5 kJ |
| 600 J | 0.6 kJ |
| 800 J | 0.8 kJ |
| 1,000 J | 1 kJ |
| 1,500 J | 1.5 kJ |
| 2,000 J | 2 kJ |
| 2,500 J | 2.5 kJ |
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Other energy conversions
⇄ Kilojoules to JoulesJoules to CaloriesJoules to KilocaloriesJoules to Watt hoursJoules to Kilowatt hours
Frequently asked questions
▸How many kilojoules are in a joule?
One joule is 0.001 kilojoules. kilojoules = joules × 0.001.
▸How do I convert joules to kilojoules?
Multiply the number of joules by 0.001. For example, 10 J × 0.001 = 0.01 kJ.
▸What is the difference between joules and kilojoules?
Joule (J) and Kilojoule (kJ) both measure energy. Energy units for food, electricity and physics. The "calorie" on a nutrition label is a kilocalorie — 1,000 of the calories used in physics.
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