From irradiance to dose and back
Converting optical quantities
Anyone working with UV converts between quantities all the time: from irradiance to dose, from dose to exposure time, from transmission to optical density, from wavelength to photon energy. The conversions are simple – what usually goes wrong are the units, when mW/cm² and W/m², or mJ/cm² and J/m², get mixed up.
The calculators here take care of exactly that. Each one shows the formula it uses; all of them run entirely in your browser, no data is transmitted.
UV Dose Calculator
Dose from irradiance and time, with conversion between mJ/cm² and J/m².
UV Exposure Time Calculator
How long does irradiation have to run to reach a target dose?
Transmission and Optical Density Calculator
Transmission, optical density and the effect of several filters in series.
Photon Energy Calculator
Photon energy, frequency and wavenumber from the wavelength — in eV and kJ/mol.
Belt Speed Calculator
Line speed, irradiance and dose in continuous processes, for conveyors and roll-to-roll.
