ClarityKitFind a tool
Photography & video

Exposure Value Calculator

Calculate EV from f-number and shutter duration at ISO 100.

Units clearly labeledCheck practical equipment limits

Camera and output settings

Runs on your device

SHOOTING ESTIMATE

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter f-number, shutter duration.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

EV100 = log2(f-number²/shutter duration).

A WORKED EXAMPLE

Using f-number = 8, shutter duration = 0.008 seconds, the result is 12.9657843 EV. Change these example inputs to match your task; use the method above to check each step.

What to keep in mind

An ideal geometric or exposure estimate. Lens behavior, stabilization, sensor crop and scene conditions may change practical results.

Common questions

Which inputs does this calculation need?

Calculate EV from f-number and shutter duration at ISO 100. Enter f-number, shutter duration in seconds. The filled example is editable and is not a saved personal record.

How should I interpret the result?

An ideal geometric or exposure estimate. Lens behavior, stabilization, sensor crop and scene conditions may change practical results.

Methodology maintained by ClarityKit. How these tools are built and checked.