LightCalc.io

Know exactly what light to bring before you step on set. Real photometric data for 200+ lighting fixtures. Calculate lux, T-stop and power draw instantly - no guesswork.

LightCalc is the on-set lighting tool built for cinematographers, gaffers and lighting professionals. Stop doing mental maths under pressure - get the right exposure, the right fixture, and the right setup in seconds.

Exposure Calculator Input your camera settings - T-stop, ISO, shutter angle, frame rate, ND filters - and instantly see the illuminance your scene needs. Switch between lux and foot-candles with one tap.

Ambient Light Meter Use your iPhone camera as a live lux meter. Point at any surface to get a real-time ambient reading and feed it directly into your calculations - no separate hardware needed.

Fixture Comparison Compare up to four lighting fixtures side by side at any distance. Adjust count and dimming per fixture and see relative output at a glance.

Power & Distance Solver Know exactly what dimming level or distance you need to hit your target exposure. Works with your chosen fixture, modifier, diffusion and gel.

Full Fixture Library Access a curated library of professional fixtures and modifiers. Plus users can add their own custom fixtures and diffusion materials - synced across web and mobile.

Projects Save your setups and reload them on the next shoot. Your lighting data travels with you.

Built for the Set Dark UI, fast inputs, haptic feedback - designed to be used in low-light environments with one hand while holding a light meter in the other.

LightCalc requires an active LightCalc Plus subscription. Manage your subscription at lightcalc.io.

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