Joule/Second to Calorie/Second Converter

Power Converter

22 units available

Decimals:

From

To

0.239006

1 J/s = 0.239006 cal/s

Formula:

cal/s = J/s × 0.2390057361

With your value: 1 J/s = 0.23900574 cal/s

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 Calorie/Second conversions

2 J/s to cal/s 3 J/s to cal/s 4 J/s to cal/s 5 J/s to cal/s 6 J/s to cal/s 7 J/s to cal/s 8 J/s to cal/s

Joule/Second to Calorie/Second Conversion Table

Joule/Second (J/s)	Calorie/Second (cal/s)
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

Calorie/Second to Joule/Second Conversion Table

Calorie/Second (cal/s)	Joule/Second (J/s)
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	4,184

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

Calorie/Second (cal/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

How to Convert Joule/Second to Calorie/Second

To convert from Joule/Second (J/s) to Calorie/Second (cal/s), multiply the value by 0.2390057361.

Formula: cal/s = J/s × 0.2390057361

Reverse: J/s = cal/s × 4.184

Step-by-Step Example

Start with your value in Joule/Second. For example: 5 J/s
Multiply by the conversion factor: 5 x 0.2390057361
The result is: 1.195029 cal/s

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 Calorie/Second

The calorie/second (cal/s) is a unit of power. One calorie/second equals 4.184 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 Calorie/Second are in 1 Joule/Second?

There are exactly 0.2390057361 Calorie/Second in 1 Joule/Second. This means the conversion factor from Joule/Second to Calorie/Second is 0.2390057361.

What is the formula to convert Joule/Second to Calorie/Second?

The formula to convert Joule/Second to Calorie/Second is: cal/s = J/s × 0.2390057361. For example, to convert 10 Joule/Second to Calorie/Second, you would multiply 10 by 0.2390057361.

What is a Joule/Second?