Free screen printing exposure calculator: mW/cm² irradiance, target mJ/cm² or seconds, solve time vs dose, ladder chart, ±10% lamp scenarios—shop planning, not emulsion spec replacement.
Important: Real exposure wins in washout tests, emulsion datasheets, mesh count/color, film density, lamp age, distance, and vacuum draw. This page is a UV dose arithmetic helper only—not a substitute for manufacturer curves, integrators, or your shop logbook.
Summary: Use either solve for time (target energy density ÷ irradiance) or solve for dose (irradiance × time). Units: mJ/cm² for dose, mW/cm² for irradiance. Charts and scenario rows stress how sensitive seconds are to small measurement errors in lamp power at the stencil plane.
Identity used: energy density (mJ/cm²) = irradiance (mW/cm²) × time (seconds), so t = D ÷ I and D = I × t when geometry and meters agree on the same plane.
Units note (short)
If your radiometer exports mW/cm² and you target mJ/cm², the product I × t yields mJ/cm² because (milliwatts × seconds) = millijoules for that normalized area.
