Work out shutter speed equivalent instantly with clear inputs, formula shown and shareable results.
Each stop doubles or halves the exposure time, so the new shutter speed is the old one multiplied by two to the power of the stops changed. Stops are the common currency of exposure, which is why adding three stops of neutral density turns 1/125 into 1/15 regardless of the starting point.
Shutter change
new time = current time x 2 ^ stops
new time = current time x 2 ^ stops. Each stop doubles or halves the exposure time, so the new shutter speed is the old one multiplied by two to the power of the stops changed.
Stops are the common currency of exposure, which is why adding three stops of neutral density turns 1/125 into 1/15 regardless of the starting point.
Enter current shutter speed, stops to change. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.