Shutter Angle Calculator
Convert a cinema shutter angle to a shutter speed at any frame rate — or work backwards from the shutter speed your camera shows.
Common shutter angles
| Angle | Shutter speed | Exposure |
|---|
A shutter angle says how much of each frame the shutter stays open: 180° is half the frame, 360° is the whole frame with no gap. The exposure time is the angle divided by 360 and by the frame rate, so 180° at 24 fps is 1/48 s and 172.8° at 24 fps is 1/50 s — the usual setting for shooting under 50 Hz lighting. Working backwards, the angle is 360 × shutter speed × frame rate. Angles are limited to 1–360° and frame rates to 1–240 fps, and a shutter speed cannot be longer than one frame interval. The conversion assumes the whole frame is exposed at once; rolling-shutter readout, flicker, aperture and ND filtration are separate. Everything runs locally in your browser with no storage, uploads or network access.