Exposure Value (EV) Calculator
Exposure value is a single number that captures how a given aperture and shutter speed combine to expose an image, and it is the language photographers use to describe brightness in a scene. This calculator takes your aperture, shutter speed, and ISO and returns the exposure value, using the standard definition where EV equals the base two logarithm of the aperture squared divided by the shutter time. It also gives the light value normalized to ISO 100, which lets you compare the brightness of different scenes regardless of your sensitivity setting. Every full stop you open the aperture, halve the shutter time, or double the ISO shifts the exposure by one EV. This helps you understand equivalent exposures, dial in manual settings, and read a light meter. All the math happens in your browser, so nothing you enter is sent to a server.
How to use Exposure Value (EV) Calculator
- Enter the aperture as an f-number.
- Enter the shutter speed.
- Enter the ISO.
- Read the calculated exposure value.
- Adjust any setting to see how EV shifts.
Frequently asked questions
What is exposure value?
EV is a single number combining aperture and shutter speed that describes a level of exposure, where each step of one EV doubles or halves the light. This tool computes it from aperture, shutter, and ISO.
How does ISO factor in?
EV is defined at a base ISO, so the tool normalizes for the ISO you enter, letting you compare settings that reach the same effective exposure at different sensitivities.
Can I go from EV back to settings?
Yes, you can enter an EV or light value and see combinations of aperture and shutter that produce it, which is handy for matching a metered scene.
What is Exposure Value (EV) Calculator?
Exposure value is a single number that captures how a given aperture and shutter speed combine to expose an image, and it is the language photographers use to describe brightness in a scene. This calculator takes your aperture, shutter speed, and ISO and returns the exposure value, using the standard definition where EV equals the base two logarithm of the aperture squared divided by the shutter time.
Is Exposure Value (EV) Calculator free to use?
Yes. Exposure Value (EV) Calculator is completely free, with no sign-up and no usage limits.
Does Exposure Value (EV) Calculator work in a web browser?
Yes. Exposure Value (EV) Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with Exposure Value (EV) Calculator?
Yes. Exposure Value (EV) Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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