Irradiance converter

Convert incident radiant power per unit area for optics and radiometry. Use the interactive converter to enter your own value and select any supported pair in this family.

Popular conversions

Use the interactive converter to enter your own value and select any supported pair in this family.

Supported units (8)

Each row links to the live converter. The factor column uses the family’s stated base unit for linear families; for specialized reciprocal or numeral systems, use the live converter and the family-specific explanation.

Source unitFactor to base unitTool
watt per square meter
W-m2
1Convert this unit ↗
kilowatt per square meter
kW-m2
1000Convert this unit ↗
milliwatt per square meter
mW-m2
0.001Convert this unit ↗
microwatt per square meter
uW-m2
1e-06Convert this unit ↗
watt per square centimeter
W-cm2
10000Convert this unit ↗
milliwatt per square centimeter
mW-cm2
10Convert this unit ↗
erg per second square centimeter
erg-s-cm2
0.001Convert this unit ↗
BTU per hour square foot
Btu-h-ft2
3.15459075Convert this unit ↗

Important note

Unit standards, historical definitions and approximations can vary. Cooking volume-to-mass conversions depend on the ingredient; currencies require an exchange rate; sizing systems may be discrete; and logarithmic quantities such as decibels need purpose-built formulas rather than a linear scale.

For laboratory, medical, aviation, engineering or other safety-critical work, verify the definitions and standards that apply to your use case.