Energy converter

Joules, calories, kilowatt-hours and BTU.

Value

From

Result

0.001 kilojoules

1 J = 0.001 kJ

Significant figures: 8

All energy units

Unit	Value	Symbol
	1	J
	0.001	kJ
	0.23900574	cal
	0.00023900574	kcal
	0.00027777778	Wh
	0.00000027777778	kWh
	6.241509 × 10^18	eV
	0.00094781712	BTU
	9.478171 × 10^9	thm
	0.73756215	ft·lb

joules to kilojoules at a glance

J	kJ
1	0.001
2	0.002
3	0.003
4	0.004
5	0.005
10	0.01
25	0.025
50	0.05
100	0.1

Other energy conversions

Kilocalories to kilojoules Kilojoules to kilocalories Kilowatt-hours to joules British thermal units to kilowatt-hours

How it works

Every unit in this dimension is defined as a ratio to one base unit — the joule. Converting is therefore two multiplications: into the base unit, then out of it.

1 J = 0.001 kJ

Rounding

Results are rounded to 8 significant figures, adjustable with the slider above. Exact factors are used internally, so chaining conversions does not accumulate error.

Sources

Conversion factors follow NIST Special Publication 811 (Guide for the Use of the International System of Units) and the BIPM SI Brochure, 9th edition. Every factor is checked by an automated round-trip test on each build.