Kilojoules to Joules – kilojoule to joule Converter

1 kJ = 1000 J

kilojoules (kJ)

joules (J)1000

Formula

J = kJ × 1000

Kilojoules to joules conversion table

kilojoules (kJ)	joules (J)
0.25 kJ	250 J
0.5 kJ	500 J
1 kJ	1000 J
2 kJ	2000 J
5 kJ	5000 J
10 kJ	10000 J
20 kJ	20000 J
50 kJ	50000 J
100 kJ	100000 J
200 kJ	200000 J
500 kJ	500000 J
1000 kJ	1000000 J
2500 kJ	2500000 J
5000 kJ	5000000 J
10000 kJ	10000000 J

Kilojoules and joules are both energy units. One kilojoule equals 1000 joules; enter any value above for an instant result, or use the table for common conversions.

Sanity-check examples

1 kJ = 1000 J
10 kJ = 10000 J
2.5 kJ = 2500 J

Common pitfalls and look-alike units

The "Calorie" on food labels and in fitness is the kilocalorie (kcal): 1 kcal = 4184 J, and the small calorie (cal) is one thousandth of it. This page uses the thermochemical calorie (1 cal = 4.184 J); the International Steam Table calorie is about 4.1868 J, so values differ slightly. The "degree" (度) on a Chinese electricity bill is one kilowatt-hour, and 1 kWh = 3600 kJ.

Frequently asked questions

How many joules are in a kilojoule?

1 kilojoule (kJ) equals 1000 joule (J).

How do I convert kilojoules to joules?

Multiply the kilojoule value by 1000 to get joule — for example, 2 kilojoules = 2000 joule.

How do I convert joules back to kilojoules?

1 joule equals 0.001 kilojoule. Use the swap button or the reverse conversion page linked on this page.

Related conversions

Need more units? Try the full Unit Converter →