calories to kJ converter

1 calorie equals 0.004184 kilojoules. Conversions use kJ = cal × 0.004184

cal → 0.004184 kJ

kJ = cal × 0.004184

Converter

Worked examples

1 cal = 0.004184 kJ
2 cal = 0.008368 kJ
5 cal = 0.02092 kJ
10 cal = 0.04184 kJ
100 cal = 0.4184 kJ

calories to kilojoules conversion table

cal	kJ	Arithmetic
1 cal	0.004184 kJ	× 0.004184
2 cal	0.008368 kJ	× 0.004184
3 cal	0.012552 kJ	× 0.004184
4 cal	0.016736 kJ	× 0.004184
5 cal	0.02092 kJ	× 0.004184
6 cal	0.025104 kJ	× 0.004184
8 cal	0.033472 kJ	× 0.004184
10 cal	0.04184 kJ	× 0.004184
12 cal	0.050208 kJ	× 0.004184
15 cal	0.06276 kJ	× 0.004184
20 cal	0.08368 kJ	× 0.004184
25 cal	0.1046 kJ	× 0.004184
30 cal	0.12552 kJ	× 0.004184
40 cal	0.16736 kJ	× 0.004184
50 cal	0.2092 kJ	× 0.004184
60 cal	0.25104 kJ	× 0.004184
70 cal	0.29288 kJ	× 0.004184
80 cal	0.33472 kJ	× 0.004184
90 cal	0.37656 kJ	× 0.004184
100 cal	0.4184 kJ	× 0.004184

How to convert cal to kJ

Take your value in calories.
Multiply by 0.004184
That is your answer in kilojoules — no rounding needed until you choose a display precision.

Related conversions

kJ to cal J to kJ kJ to J kJ to kcal kJ to Wh kJ to kWh kJ to Btu cal to J cal to kcal all energy units

Questions

How many kilojoules in 1 calorie?

Exactly 0.004184 kJ. The factor follows from the definitions of both units, not from a measurement, so it is exact.

How do I convert cal to kJ?

Multiply the calories figure by 0.004184 — or use the converter above, which updates as you type.

Is cal to kJ the same as kJ to cal?

No — they are inverses. One cal is 0.004184 kJ, while one kJ is 239.006 cal.

What is 1 cal in kJ?

1 cal = 0.004184 kJ (see the value page for the full arithmetic).