Photography Exposure Calculator

Calculate exposure value (EV) from aperture, shutter speed, and ISO.

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What This Calculator Does

Calculate exposure value (EV) from aperture, shutter speed, and ISO.

It combines Aperture (f-number), Shutter Speed, ISO to estimate Exposure Value (EV100), Exposure Value (at ISO), Shutter Speed.

Formula & Method

Exposure value formulas: EV_{100}=\log_2\left(\frac{N^2}{t}\right) and ISO-adjusted EV EV=EV_{100}-\log_2\left(\frac{ISO}{100}\right).

Notation used in the formulas: R = Exposure Value (EV100); x_{1} = Aperture (f-number); x_{2} = Shutter Speed; x_{3} = ISO.

Method summary: inputs are normalized to consistent units, core equations are evaluated, then secondary values are derived and rounded for display.

Use this calculator for quick scenario analysis. Start with baseline values, change one driver at a time, and compare how sensitive the results are to each input shown above.

Inputs Used

Aperture (f-number): Used directly in the calculation.
Shutter Speed: Used directly in the calculation.
ISO: Used directly in the calculation.

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