Kilocalories to Kilojoules

Convert kcal to kJ instantly — with a table, common energy values, and a live calculator.

1 kcal equals 4.18 kJ.

Updated June 3, 2026Open the Unit Converter →

Convert any energy

Energy (kcal)

Result (kJ)4.18 kJ

kcal to kJ table

kcal	kJ
1 kcal	4.18 kJ
2 kcal	8.37 kJ
3 kcal	12.55 kJ
5 kcal	20.92 kJ
10 kcal	41.84 kJ
15 kcal	62.76 kJ
20 kcal	83.68 kJ
25 kcal	104.6 kJ
30 kcal	125.52 kJ
40 kcal	167.36 kJ
50 kcal	209.2 kJ
60 kcal	251.04 kJ
75 kcal	313.8 kJ
90 kcal	376.56 kJ
100 kcal	418.4 kJ
120 kcal	502.08 kJ
150 kcal	627.6 kJ
200 kcal	836.8 kJ
250 kcal	1046 kJ
300 kcal	1255.2 kJ
400 kcal	1673.6 kJ
500 kcal	2092 kJ

kJ to kcal (reverse)

kJ	kcal
1 kJ	0.239 kcal
2 kJ	0.478 kcal
3 kJ	0.717 kcal
5 kJ	1.2 kcal
10 kJ	2.39 kcal
15 kJ	3.59 kcal
20 kJ	4.78 kcal
25 kJ	5.98 kcal
30 kJ	7.17 kcal
40 kJ	9.56 kcal
50 kJ	11.95 kcal
60 kJ	14.34 kcal
75 kJ	17.93 kcal
90 kJ	21.51 kcal
100 kJ	23.9 kcal
120 kJ	28.68 kcal
150 kJ	35.85 kcal
200 kJ	47.8 kcal
250 kJ	59.75 kcal
300 kJ	71.7 kcal
400 kJ	95.6 kcal
500 kJ	119.5 kcal

Common energy values

kcal	kJ
5 kcal	20.92 kJ
10 kcal	41.84 kJ
25 kcal	104.6 kJ
50 kcal	209.2 kJ
75 kcal	313.8 kJ
100 kcal	418.4 kJ
120 kcal	502.08 kJ
150 kcal	627.6 kJ
200 kcal	836.8 kJ
300 kcal	1255.2 kJ
400 kcal	1673.6 kJ
500 kcal	2092 kJ

How it scales

1 kWh in other units

The ratio at a glance

Joules, kWh, and calories — the key energy units

Joules (J), kilojoules (kJ), and megajoules (MJ) are the SI units of energy. The kilowatt-hour (kWh) is the unit on your electricity bill and equals 3.6 MJ. With calories there are two sizes that must not be confused: the kilocalorie (kcal) on nutrition labels equals exactly 4184 J (4.184 kJ), while the small calorie (cal) is only 4.184 J — they differ by a factor of 1000. The BTU (British thermal unit) equals 1055.06 J and is used in heating and air-conditioning.

Energy conversions are exact and rest on fixed factors — for more unit pairs, use our energy conversion hub.

Related conversions

Kilojoules to Kilocalories

Kilowatt-hours to Joules

Joules to Kilowatt-hours

Calories to Joules

Joules to Calories

Frequently asked questions

How many kJ are in 1 kcal?

1 kcal equals 4.18 kJ.

How many kJ are in 2 kcal?

2 kcal equal 8.37 kJ.

How do I convert kcal to kJ?

Multiply the energy in kcal by 4.18 to get kJ.

What is a kilocalorie (kcal)?

A kilocalorie (kcal) equals exactly 4184 joules, or 4.184 kJ. It is the “Calorie” printed on nutrition labels — that is, 1000 of the small physical calories (cal).

What are these energy units used for?

Joules (J), kilojoules (kJ), and megajoules (MJ) are the SI units of energy. The kilowatt-hour (kWh) is the unit on your electricity bill, kilocalories (kcal) appear on food labels, and the BTU (British thermal unit) is used in heating and air-conditioning.

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Kilocalories to Kilojoules

Convert kcal to kJ instantly — with a table, common energy values, and a live calculator.

1 kcal equals 4.18 kJ.

Updated June 3, 2026Open the Unit Converter →

Convert any energy

Energy (kcal)

Result (kJ)4.18 kJ

kcal to kJ table

kcal	kJ
1 kcal	4.18 kJ
2 kcal	8.37 kJ
3 kcal	12.55 kJ
5 kcal	20.92 kJ
10 kcal	41.84 kJ
15 kcal	62.76 kJ
20 kcal	83.68 kJ
25 kcal	104.6 kJ
30 kcal	125.52 kJ
40 kcal	167.36 kJ
50 kcal	209.2 kJ
60 kcal	251.04 kJ
75 kcal	313.8 kJ
90 kcal	376.56 kJ
100 kcal	418.4 kJ
120 kcal	502.08 kJ
150 kcal	627.6 kJ
200 kcal	836.8 kJ
250 kcal	1046 kJ
300 kcal	1255.2 kJ
400 kcal	1673.6 kJ
500 kcal	2092 kJ

kJ to kcal (reverse)

kJ	kcal
1 kJ	0.239 kcal
2 kJ	0.478 kcal
3 kJ	0.717 kcal
5 kJ	1.2 kcal
10 kJ	2.39 kcal
15 kJ	3.59 kcal
20 kJ	4.78 kcal
25 kJ	5.98 kcal
30 kJ	7.17 kcal
40 kJ	9.56 kcal
50 kJ	11.95 kcal
60 kJ	14.34 kcal
75 kJ	17.93 kcal
90 kJ	21.51 kcal
100 kJ	23.9 kcal
120 kJ	28.68 kcal
150 kJ	35.85 kcal
200 kJ	47.8 kcal
250 kJ	59.75 kcal
300 kJ	71.7 kcal
400 kJ	95.6 kcal
500 kJ	119.5 kcal

Common energy values

kcal	kJ
5 kcal	20.92 kJ
10 kcal	41.84 kJ
25 kcal	104.6 kJ
50 kcal	209.2 kJ
75 kcal	313.8 kJ
100 kcal	418.4 kJ
120 kcal	502.08 kJ
150 kcal	627.6 kJ
200 kcal	836.8 kJ
300 kcal	1255.2 kJ
400 kcal	1673.6 kJ
500 kcal	2092 kJ

How it scales

1 kWh in other units

The ratio at a glance

Joules, kWh, and calories — the key energy units

Energy conversions are exact and rest on fixed factors — for more unit pairs, use our energy conversion hub.

Related conversions

Kilojoules to Kilocalories

Kilowatt-hours to Joules

Joules to Kilowatt-hours

Calories to Joules

Joules to Calories

Frequently asked questions

How many kJ are in 1 kcal?

1 kcal equals 4.18 kJ.

How many kJ are in 2 kcal?

2 kcal equal 8.37 kJ.

How do I convert kcal to kJ?

Multiply the energy in kcal by 4.18 to get kJ.

What is a kilocalorie (kcal)?

A kilocalorie (kcal) equals exactly 4184 joules, or 4.184 kJ. It is the “Calorie” printed on nutrition labels — that is, 1000 of the small physical calories (cal).

What are these energy units used for?

Convert any unit

The unit converter handles length, volume, weight, and more.

Open Unit Converter →

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