Exposure Calculator
Dial in your camera settings with confidence. Enter your current aperture, shutter speed, and ISO, then pick a new aperture to see what shutter speed or ISO you need for the same exposure. Great for learning the exposure triangle or quickly adapting to changing light.
The exposure triangle connects three settings that control how much light reaches your camera sensor:
- Aperture (f-stop) -- controls the size of the lens opening. Lower numbers = more light, shallower depth of field.
- Shutter speed -- how long the sensor is exposed. Slower = more light, more motion blur.
- ISO -- sensor sensitivity. Higher = brighter image but more noise/grain.
Exposure Value (EV) is calculated as: EV = log2(f^2 / t), where f is the f-number and t is the shutter speed in seconds.
The Sunny 16 Rule: On a bright sunny day, set your aperture to f/16 and your shutter speed to 1/ISO. For example, at ISO 200, use f/16 and 1/200s. This gives you a reliable starting point without a light meter.
Each full stop doubles or halves the light:
- Aperture stops: f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22
- Shutter stops: 1/30, 1/60, 1/125, 1/250, 1/500, 1/1000
- ISO stops: 100, 200, 400, 800, 1600, 3200