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Shutter Speed Equivalent Calculator

Work out shutter speed equivalent instantly with clear inputs, formula shown and shareable results.

About Shutter Speed Equivalent Calculator

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.

Formula

Shutter change

new time = current time x 2 ^ stops

Worked example

With the default values below, Shutter Speed Equivalent Calculator returns New shutter speed of 0.032000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Current shutter speedminimum 0 s
0.008 s
Stops to changeaccepts -15–15
2

Results

New shutter speed
0.032000 s
New speed as a fraction
1/31
Time multiplier
4.0000
Long exposure in minutes and seconds
under a second

Step by step

  1. 1Values used
  2. 2Shutter change
  3. 3New shutter speed= 0.032000 s
  4. 4New speed as a fraction= 1/31
  5. 5Time multiplier= 4.0000
  6. 6Long exposure in minutes and seconds= under a second

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 6 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Shutter Speed Equivalent figure worked out?

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.

Why does this matter?

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.

What do I need to enter?

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.

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