Joule per second to Milliwatt Converter (and vice versa)

Created by: tinycalcs.com/en
Number of supported units: 2
Last update: 2026

This converter allows you to convert joules per second [J/s] to milliwatts [mW] or milliwatts [mW] to joules per second [J/s]. Calculations are performed in both directions. The calculation result and the entered value are displayed with up to 20 decimal places for maximum accuracy.

1 joule per second [J/s] = 1,000 milliwatts [mW]1 milliwatt [mW] = 0.001 joules per second [J/s]

Convert joules per second to milliwatts

There are two simple ways to convert joules per second [J/s] to milliwatts [mW]. In the first calculation method, the value in joules per second [J/s] is divided by 0.001. The second method multiplies the value in joules per second [J/s] by 1,000.

  • Milliwatts [mW] = joules per second [J/s] ÷ 0.001
  • Milliwatts [mW] = joules per second [J/s] * 1,000

Convert milliwatts to joules per second

Converting milliwatts [mW] to joules per second [J/s] is easy and can be done in two ways. The first method involves multiplication, whereby the value in milliwatts [mW] is multiplied by 0.001. The second variant is a division. Here, the value in milliwatts [mW] is divided by 1,000.

  • Joules per second [J/s] = milliwatts [mW] * 0.001
  • Joules per second [J/s] = milliwatts [mW] ÷ 1,000

Converter

Decimal places

How it's calculated

Factor: 
1,000
Milliwatts=Joules per second*1,000
Joules per second=
Milliwatts1,000

To all available units

Joules per second

Nanowatts

Joules per second

Terawatts

Kilocalories per hour

Centiwatts

Kilocalories per hour

Decawatts

Kilocalories per hour

Deciwatts

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