Convert 120 Milliwatt (mW) to Calorie/Second (cal/s).

120 Milliwatt equals 0.028681 Calorie/Second. Multiply 120 by 0.0002390057.

120 Milliwatt = 0.028681 Calorie/Second

Worked example: converting Milliwatt to Calorie/Second

Step 1 — start with the formula. cal/s = mW × 0.0002390057
Step 2 — substitute your figure. 120 mW × 0.0002390057
Step 3 — read the result. 120 mW = 0.028681 cal/s
Step 4 — check it in reverse. mW = cal/s × 4,184 returns 120.0013 mW, which matches the figure you started with.

Power Converter

22 units available

Decimals:

From

To

0.028681

120 mW = 0.028681 cal/s

Formula:

cal/s = mW × 0.0002390057

With your value: 120 mW = 0.02868069 cal/s

How big is that?

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

Your value120 mW

LED bulb (75× your value)9.00e+3 mW

Laptop (5.4e+2× your value)6.50e+4 mW

Microwave oven (8.3e+3× your value)1.00e+6 mW

Electric kettle (2.5e+4× your value)3.00e+6 mW

Family car engine (7.5e+5× your value)9.00e+7 mW

Other Milliwatt to Calorie/Second conversions

85 mW to cal/s 90 mW to cal/s 96 mW to cal/s 100 mW to cal/s 150 mW to cal/s 200 mW to cal/s 500 mW to cal/s Full Milliwatt to Calorie/Second converter

Milliwatt to Calorie/Second Conversion Table

Milliwatt (mW)	Calorie/Second (cal/s)
0.5	0.00012
1	0.000239
2	0.000478
5	0.001195
10	0.00239
15	0.003585
20	0.00478
25	0.005975
50	0.01195
100	0.023901
250	0.059751
500	0.119503
1000	0.239006

Calorie/Second to Milliwatt Conversion Table

Calorie/Second (cal/s)	Milliwatt (mW)
0.5	2,092
1	4,184
2	8,368
5	20,920
10	41,840
15	62,760
20	83,680
25	104,600
50	209,200
100	418,400
250	1,046,000
500	2,092,000
1000	4,184,000

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.

Milliwatt (mW)

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 Milliwatt to Calorie/Second

To convert from Milliwatt (mW) to Calorie/Second (cal/s), multiply the value by 0.0002390057.

Formula: cal/s = mW × 0.0002390057

Reverse: mW = cal/s × 4,184

Step-by-Step Example

Start with your value in Milliwatt. For example: 5 mW
Multiply by the conversion factor: 5 x 0.0002390057
The result is: 0.001195 cal/s

About Milliwatt

The milliwatt (mW) is a unit of power. One milliwatt equals 0.001 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 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 120 Milliwatt in Calorie/Second?

120 Milliwatt equals 0.028681 Calorie/Second.

How many Calorie/Second are in 1 Milliwatt?

There are exactly 0.0002390057 Calorie/Second in 1 Milliwatt. This means the conversion factor from Milliwatt to Calorie/Second is 0.0002390057.

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

The formula to convert Milliwatt to Calorie/Second is: cal/s = mW × 0.0002390057. For example, to convert 10 Milliwatt to Calorie/Second, you would multiply 10 by 0.0002390057.

What is a Milliwatt?