Convert 20 Watt (W) to Calorie/Second (cal/s).

20 Watt equals 4.780115 Calorie/Second. Multiply 20 by 0.2390057361.

20 Watt = 4.780115 Calorie/Second

Worked example: converting Watt to Calorie/Second

Step 1 — start with the formula. cal/s = W × 0.2390057361
Step 2 — substitute your figure. 20 W × 0.2390057361
Step 3 — read the result. 20 W = 4.780115 cal/s
Step 4 — check it in reverse. W = cal/s × 4.184 returns 20 W, which matches the figure you started with.

Power Converter

22 units available

Decimals:

From

To

4.780115

20 W = 4.780115 cal/s

Formula:

cal/s = W × 0.2390057361

With your value: 20 W = 4.78011472 cal/s

How big is that?

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

LED bulb (1/2.2 your value)9.00 W

Your value20.0 W

Laptop (3.3× your value)65.0 W

Microwave oven (50× your value)1.00e+3 W

Electric kettle (1.5e+2× your value)3.00e+3 W

Family car engine (4.5e+3× your value)9.00e+4 W

Other Watt to Calorie/Second conversions

14 W to cal/s 15 W to cal/s 16 W to cal/s 18 W to cal/s 21 W to cal/s 24 W to cal/s 25 W to cal/s Full Watt to Calorie/Second converter

Watt to Calorie/Second Conversion Table

Watt (W)	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 Watt Conversion Table

Calorie/Second (cal/s)	Watt (W)
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.

Watt (W)

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 Watt to Calorie/Second

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

Formula: cal/s = W × 0.2390057361

Reverse: W = cal/s × 4.184

Step-by-Step Example

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

About Watt

The watt (W) is a unit of power. One watt 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

What is 20 Watt in Calorie/Second?

20 Watt equals 4.780115 Calorie/Second.

How many Calorie/Second are in 1 Watt?

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

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

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

What is a Watt?