Kilocalorie/Hour to Kilojoule/Hour Converter

Power Converter

22 units available

Decimals:

From

To

4.184

1 kcal/h = 4.184 kJ/h

Formula:

kJ/h = kcal/h × 4.1839999992

With your value: 1 kcal/h = 4.184 kJ/h

How big is that?

Everyday references on a logarithmic scale, all expressed in kilocalorie/hour so you can sanity-check the result.

Your value1.00 kcal/h

LED bulb (7.7× your value)7.74 kcal/h

Laptop (56× your value)55.9 kcal/h

Microwave oven (8.6e+2× your value)860 kcal/h

Electric kettle (2.6e+3× your value)2.58e+3 kcal/h

Family car engine (7.7e+4× your value)7.74e+4 kcal/h

Other Kilocalorie/Hour to Kilojoule/Hour conversions

2 kcal/h to kJ/h 3 kcal/h to kJ/h 4 kcal/h to kJ/h 5 kcal/h to kJ/h 6 kcal/h to kJ/h 7 kcal/h to kJ/h 8 kcal/h to kJ/h

Kilocalorie/Hour to Kilojoule/Hour Conversion Table

Kilocalorie/Hour (kcal/h)	Kilojoule/Hour (kJ/h)
0.5	2.092
1	4.184
2	8.368
5	20.92
10	41.84
15	62.76
20	83.68
25	104.6
50	209.2
100	418.4
250	1,046
500	2,092
1000	4,183.999999

Kilojoule/Hour to Kilocalorie/Hour Conversion Table

Kilojoule/Hour (kJ/h)	Kilocalorie/Hour (kcal/h)
0.5	0.119503
1	0.239006
2	0.478011
5	1.195029
10	2.390057
15	3.585086
20	4.780115
25	5.975143
50	11.950287
100	23.900574
250	59.751434
500	119.502868
1000	239.005736

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Kilocalorie/Hour (kcal/h)

Power

Exact conversion

Derived from the watt (1 W = 1 J/s).

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Kilojoule/Hour (kJ/h)

Power

Exact conversion

Derived from the watt (1 W = 1 J/s).

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Kilocalorie/Hour to Kilojoule/Hour

To convert from Kilocalorie/Hour (kcal/h) to Kilojoule/Hour (kJ/h), multiply the value by 4.1839999992.

Formula: kJ/h = kcal/h × 4.1839999992

Reverse: kcal/h = kJ/h × 0.2390057362

Step-by-Step Example

Start with your value in Kilocalorie/Hour. For example: 5 kcal/h
Multiply by the conversion factor: 5 x 4.1839999992
The result is: 20.92 kJ/h

About Kilocalorie/Hour

The kilocalorie/hour (kcal/h) is a unit of power. One kilocalorie/hour equals 1.162222222 watts. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: power calculations, engineering and science, education.

About Kilojoule/Hour

The kilojoule/hour (kJ/h) is a unit of power. One kilojoule/hour equals 0.2777777778 watts. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: power calculations, engineering and science, education.

Frequently Asked Questions

How many Kilojoule/Hour are in 1 Kilocalorie/Hour?

There are exactly 4.1839999992 Kilojoule/Hour in 1 Kilocalorie/Hour. This means the conversion factor from Kilocalorie/Hour to Kilojoule/Hour is 4.1839999992.

What is the formula to convert Kilocalorie/Hour to Kilojoule/Hour?

The formula to convert Kilocalorie/Hour to Kilojoule/Hour is: kJ/h = kcal/h × 4.1839999992. For example, to convert 10 Kilocalorie/Hour to Kilojoule/Hour, you would multiply 10 by 4.1839999992.

What is a Kilocalorie/Hour?