calories to kilojoules

Convert calorie (small) to kilojoule — instant, free, with the formula shown.

1 cal=0.004184 kJ

How to convert calorie (small) to kilojoule

To convert calorie (small) to kilojoule, multiply by 0.004184:

kJ = cal × 0.004184

For example, 10 cal × 0.004184 = 0.04184 kJ.

cal to kJ conversion table

calories (cal)	kilojoules (kJ)
1 cal	0.004184 kJ
2 cal	0.008368 kJ
5 cal	0.02092 kJ
10 cal	0.04184 kJ
25 cal	0.1046 kJ
50 cal	0.2092 kJ
100 cal	0.4184 kJ
250 cal	1.046 kJ
500 cal	2.092 kJ
1000 cal	4.184 kJ

Reverse: Kilojoule to Calorie (small)

Other calorie (small) conversions

cal → J cal → kcal cal → Wh cal → kWh cal → BTU cal → thm cal → eV cal → ft·lb

Convert to kilojoule from another unit

J → kJ kcal → kJ Wh → kJ kWh → kJ BTU → kJ thm → kJ eV → kJ ft·lb → kJ

cal to kJ — frequently asked

How many kilojoules are in 1 calorie (small)?

1 calorie (small) = 0.004184 kilojoules (cal × 0.004184 = kJ).

What is the formula to convert calorie (small) to kilojoule?

Multiply your calorie (small) value by 0.004184 to get kilojoule.

How do I convert 10 calories to kilojoules?

10 cal = 0.04184 kJ. For 100 cal the answer is 0.4184 kJ. Use the calculator on this page for any other value.

When to convert calorie (small) to kilojoule

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.

Compound Interest Calculator

SIP, FD, and investment returns

BMI Calculator

Body Mass Index with Asian thresholds

Calorie Calculator

Daily intake, TDEE & macros

Loan EMI Calculator

Home, car & personal loan EMI

Caffeine Half-Life Calculator

How long caffeine stays in your system

Percentage Calculator

Convert marks to percentage

See all energy converters