mW/cm2\text{mW/cm}^{2}

milliwatt per square centimeter

Intensityexact by definition

The milliwatt per square centimetre equals exactly 10 watts per square metre, since a square centimetre is exactly 1e-4 square metres. It is the customary unit in laser safety classification, UV curing, phototherapy dosimetry and radiofrequency exposure standards. The factor of 10 is exact, following from the exact definition of the centimetre.

Watch out: The factor between milliwatts per square centimetre and watts per square metre is 10, not 1 or 100, because the milli prefix and the centimetre-squared area partly cancel. Getting it backwards misstates an exposure by a factor of 100.

1 mW/cm2\text{mW/cm}^{2} 10 W/m2\text{W/m}^{2}

One milliwatt per square centimeter in every intensity unit

10,000,000microwatt per square meter (μW/m²)
10,000milliwatt per square meter (mW/m²)
1,000microwatt per square centimeter (μW/cm²)
10watt per square meter (W/m²)
3.16998BTU per hour square foot (BTU/(h·ft²))
1milliwatt per square centimeter (mW/cm²)this unit
0.0143403langley per minute (Ly/min)
0.01kilowatt per square meter (kW/m²)
0.001watt per square centimeter (W/cm²)
1.00000e-09megawatt per square centimeter (MW/cm²)