OD\u2013Transmission Converter

Convert between optical density (OD) and percent transmission. Calculate total OD and transmission for stacked filters.

Input
Stacked Filters
OD → Transmission
Optical density (OD)
Input value
2.0000
Fractional transmission (T)
T = 10^(−OD)
0.01000
Percent transmission (%T)
%T = T × 100
1.0000%
Attenuation factor
1/T
100.00×
Stacked Filters
Configuration
2× OD 2.0000
Total OD
OD_total = n \u00D7 OD_individual
4.0000
Total %T
0.0100%
Total attenuation
10000.0×
Abridged Optics — OD\u2013Transmission Converter v1.0Optical density: OD = \u2212log\u2081\u2080(T). Transmission: T = 10^(\u2212OD). Stacked filters: OD_total = n \u00D7 OD_individual (assumes negligible inter-filter reflections).

All information, equations, and calculations have been compiled and verified to the best of our ability. For mission-critical applications, we recommend independent verification of all values. If you find an error, please let us know.