Exposure Value
Exposure value combines aperture and shutter time on a logarithmic scale. Each step corresponds to a factor of two in exposure settings.
Exposure Value
Exposure · 2 inputs
How to use this calculator
- Enter f-number in f/.
- Enter exposure time in s.
- Select Calculate and keep the output unit with the answer.
Before you use the answer
Keep capture settings, physical dimensions and delivery requirements in separate columns of the job notes. A mathematically equivalent setting may change motion blur, depth of field or noise. Check an actual frame before committing an entire session to a numerical estimate.
This is the settings-based EV without an ISO correction.
Does it save my inputs?
No calculation history is stored by this website. The calculator works locally in your browser. See the privacy policy for hosting and contact details.
Why might a result be approximate?
Measurement uncertainty, ideal-model assumptions and floating-point rounding can all matter. Displaying more digits does not improve the original measurement.
Related calculations
ISO-Normalized EV100
Normalizing exposure settings to ISO one hundred makes equivalent settings easier to compare.
Open calculator ↗Shutter after Stop Change
Each additional stop doubles exposure time at a fixed aperture and scene.
Open calculator ↗Aperture Stop Difference
F-number controls aperture area through a squared relationship, which gives two logarithmic factors.
Open calculator ↗