Exposure Value (EV) Calculator

Work with photographic exposure values. Enter aperture, shutter speed, and ISO to get EV and EV100; or give a target EV100 and ISO and solve for the shutter at a given aperture (or vice-versa), plus a table of equivalent exposures at every full stop. Pairs with the Depth of Field Calculator. Everything runs locally in your browser.

Aperture f/ Shutter ISO

EV = log₂(N² / t), where N is the f-number and t the shutter time in seconds. EV100 normalises to ISO 100 by subtracting log₂(ISO / 100), so EV100 = EV − log₂(ISO/100). All combinations in the table are equivalent: same EV100 means the same total light. Everything runs locally — nothing leaves your browser.