Exposure Triangle Calculator
Calculate the Exposure Value (EV) from aperture, shutter speed, and ISO settings.
How to Use the Exposure Triangle Calculator
- Enter the aperture f-number (e.g. 2.8 for f/2.8).
- Enter the shutter speed in seconds (e.g. 0.004 for 1/250s).
- Enter the ISO value.
- Click Calculate to see the Exposure Value and your current settings.
Cas d'utilisation
- •Understanding how changing one setting affects exposure.
- •Finding equivalent exposures with different settings.
- •Learning photography fundamentals.
- •Quick EV reference in the field.
Formule
EV = log₂(f² / t) − log₂(ISO / 100). Higher EV = brighter scene. EV 0 = f/1, 1s, ISO 100.
Questions fréquemment posées
What is the exposure triangle?
The exposure triangle describes the relationship between aperture (f-stop), shutter speed, and ISO — three settings that control image exposure.
What is a good EV value?
EV depends on lighting. Bright sunlight is about EV 15, indoor lighting EV 5–7, and night scenes can be EV 0 or below.
Is it free?
Yes, all calculators on OhMyCalc are completely free.