DESIGN PLANNING · VERSION 1.0.0

Photography Exposure Value Calculator

Calculate exposure value from aperture and shutter duration.

Instant calculationCompare five scenariosJSON + CSV exports

Your inputs

Calculation results

Formula & assumptions

EV = log₂(N²/t); ISO-adjusted EV100 = EV − log₂(ISO/100).

Values use the specified units. Calculations use floating-point arithmetic. Check input measurements and formula assumptions before applying the result.

Compare your scenarios

Save up to five results to compare changes side by side. Scenarios stay in this tab until you clear or reload it.

Using Photography Exposure Value Calculator

Calculate exposure value from aperture and shutter duration.

Enter aperture f-number, shutter duration, iso using the units printed under each field.
Choose Calculate, or enable live updates. Review the result labels and formula assumptions.
Save scenarios to compare up to five variations, then copy the report or download JSON or CSV.

Example

Aperture f-number: 8 f-number
Shutter duration: 0.008 seconds
ISO: 100 ISO
Exposure value: 12.965784
EV100 adjusted for ISO: 12.965784

Questions & answers

What does Photography Exposure Value Calculator calculate?

Calculate exposure value from aperture and shutter duration.

Which units should I enter?

Aperture f-number uses f-number. Shutter duration uses seconds. ISO uses ISO. Convert values to these units before calculating.

Which formula does it use?

EV = log₂(N²/t); ISO-adjusted EV100 = EV − log₂(ISO/100).

What does the included example show?

Aperture f-number: 8 f-number; Shutter duration: 0.008 seconds; ISO: 100 ISO. Result: Exposure value = 12.965784; EV100 adjusted for ISO = 12.965784.

Can I compare different settings?

Yes. Save a scenario, change the inputs and save another result. Up to five scenarios are compared in this tab; they disappear when you reload or leave.

Can I export the calculation?

Copy the JSON report or download JSON and CSV with inputs, result labels and numeric values. Processing uses local JavaScript; no calculation request is sent to our server. Displayed values use up to 10 significant digits; exports retain JavaScript numeric precision.