Exposure Calculator
Calculate equivalent exposure settings when changing aperture, shutter speed, or ISO
About this calculator
The Exposure Calculator helps photographers maintain consistent exposure while adjusting camera settings. By calculating equivalent combinations of aperture, shutter speed, and ISO, this tool ensures your photos remain properly exposed when you need to change one setting for creative or technical reasons. Whether you're adapting to changing light conditions or seeking specific creative effects like shallow depth of field or motion blur, this calculator eliminates guesswork and prevents over or underexposed images.
How to use
Enter your current camera settings (aperture, shutter speed, and ISO) into the calculator. Select which setting you want to change and input your desired new value. The calculator will automatically compute the equivalent settings for the remaining parameters to maintain the same exposure level.
Frequently asked questions
What is equivalent exposure in photography?
Equivalent exposure refers to different combinations of aperture, shutter speed, and ISO that produce the same brightness level in your photograph.
Why would I need to change exposure settings?
You might change settings to achieve creative effects like bokeh, freeze motion, reduce noise, or adapt to lighting conditions.
Does changing equivalent exposure affect image quality?
While exposure remains the same, image characteristics change - different apertures affect depth of field, and higher ISOs increase noise.