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Exposure Calculator

Find the exposure value (EV) from aperture, shutter and ISO.

Calculated Output

Exposure value (EV) 12.966

Formula: EV = log2(N^2 / t) - log2(ISO / 100)

Step-by-Step Breakdown

1. Values used:

2. Aperture (f-number) = 8

3. Shutter speed = 0.008

4. ISO = 100

6. Exposure value (EV) = 12.966

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The math behind it

EV = log2(aperture^2 / shutter) adjusted for ISO. Each whole EV step doubles or halves the light.

f/8, 1/125 s, ISO 100 gives about EV 13.

What is the exposure triangle?

Aperture, shutter speed and ISO trade off to set the total exposure.