Shutter Speed Calculator
Calculate the correct camera shutter speed from aperture, ISO, and exposure value with lighting presets for outdoor, indoor, and low-light scenes.
How to Calculate Shutter Speed
Shutter speed controls how long the camera sensor is exposed to light. Given aperture (f-number), ISO, and exposure value (EV), the correct shutter speed is:
$$\text{shutter} = \frac{100 \times f^2}{\text{ISO} \times 2^{EV}}$$Example: f/5.6, ISO 200, EV 15 (bright sun) gives shutter ≈ 1/2090 second.
Exposure Value and Lighting
EV describes scene brightness. Bright daylight is around EV 15, overcast skies EV 12-13, indoor rooms EV 5-6, and moonlit scenes can be EV -3 or lower. Select a lighting preset or enter a custom EV.
Related tool: Exposure Calculator.
Frequently Asked Questions
What does a slower shutter speed mean?
A slower (longer) shutter lets in more light but can blur moving subjects. Faster shutters freeze motion but need more light or higher ISO.
How does aperture affect shutter speed?
A wider aperture (lower f-number) allows a faster shutter at the same brightness. Shutter speed scales with the square of the f-number.
Should I use the sunny 16 rule?
The sunny 16 rule (f/16, 1/ISO in bright sun) is a quick estimate. This calculator uses the same exposure math with any aperture, ISO, and EV.
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