Joule/Second to Kilocalorie/Hour Converter

Power Converter

22 units available

Decimals:

From

To

0.860421

1 J/s = 0.860421 kcal/h

Formula:

kcal/h = J/s × 0.8604206503

With your value: 1 J/s = 0.86042065 kcal/h

How big is that?

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

Your value1.00 J/s

LED bulb (9.0× your value)9.00 J/s

Laptop (65× your value)65.0 J/s

Microwave oven (1.0e+3× your value)1.00e+3 J/s

Electric kettle (3.0e+3× your value)3.00e+3 J/s

Family car engine (9.0e+4× your value)9.00e+4 J/s

Other Joule/Second to Kilocalorie/Hour conversions

2 J/s to kcal/h 3 J/s to kcal/h 4 J/s to kcal/h 5 J/s to kcal/h 6 J/s to kcal/h 7 J/s to kcal/h 8 J/s to kcal/h

Joule/Second to Kilocalorie/Hour Conversion Table

Joule/Second (J/s)	Kilocalorie/Hour (kcal/h)
0.5	0.43021
1	0.860421
2	1.720841
5	4.302103
10	8.604207
15	12.90631
20	17.208413
25	21.510516
50	43.021033
100	86.042065
250	215.105163
500	430.210325
1000	860.42065

Kilocalorie/Hour to Joule/Second Conversion Table

Kilocalorie/Hour (kcal/h)	Joule/Second (J/s)
0.5	0.581111
1	1.162222
2	2.324444
5	5.811111
10	11.622222
15	17.433333
20	23.244444
25	29.055556
50	58.111111
100	116.222222
250	290.555556
500	581.111111
1000	1,162.222222

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.

Joule/Second (J/s)

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

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

How to Convert Joule/Second to Kilocalorie/Hour

To convert from Joule/Second (J/s) to Kilocalorie/Hour (kcal/h), multiply the value by 0.8604206503.

Formula: kcal/h = J/s × 0.8604206503

Reverse: J/s = kcal/h × 1.162222222

Step-by-Step Example

Start with your value in Joule/Second. For example: 5 J/s
Multiply by the conversion factor: 5 x 0.8604206503
The result is: 4.302103 kcal/h

About Joule/Second

The joule/second (J/s) is a unit of power. One joule/second equals 1 watt. 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 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.

Frequently Asked Questions

How many Kilocalorie/Hour are in 1 Joule/Second?

There are exactly 0.8604206503 Kilocalorie/Hour in 1 Joule/Second. This means the conversion factor from Joule/Second to Kilocalorie/Hour is 0.8604206503.

What is the formula to convert Joule/Second to Kilocalorie/Hour?

The formula to convert Joule/Second to Kilocalorie/Hour is: kcal/h = J/s × 0.8604206503. For example, to convert 10 Joule/Second to Kilocalorie/Hour, you would multiply 10 by 0.8604206503.

What is a Joule/Second?