Visualize and calculate the exposure triangle — aperture, shutter speed, and ISO. See how adjusting one setting affects the others while maintaining correct exposure.
The Exposure Triangle Calculator shows the dynamic relationship between aperture, shutter speed, and ISO in photography. Adjust one slider and instantly see how the other two must change to maintain the same overall exposure, measured in stops. It is a fast way to reason about manual exposure without working through the math on the back of the camera.
The exposure triangle is the core concept in manual photography. Every correct exposure is a balance: opening the aperture lets in more light but reduces depth of field; slowing the shutter lets in more light but introduces motion blur; raising ISO brightens the image but adds noise. Mastering these trade-offs is what separates snapshots from intentional photographs.
This interactive tool lets you start with a "correct" exposure and then shift stops between the three variables. The visual triangle diagram shows the balance at a glance, and the creative effects panel explains what your current settings will produce - deep or shallow focus, frozen or blurred motion, clean or noisy image. It makes exposure tradeoffs visible before you dial them into the camera.
Use this calculator when you want to see how a stop change in one setting affects the others before you shoot. It is useful for learning manual exposure, teaching the triangle, and comparing creative tradeoffs between motion blur, depth of field, and noise when you are deciding between settings. That keeps the exposure decision tied to the effect you actually want in the final image.
Exposure in stops = log₂(f²) - log₂(t) - log₂(ISO/100). Shifting +1 stop in any parameter compensates -1 stop in another. Total EV remains constant when compensated correctly.
Result: EV 12.6 (balanced exposure)
f/5.6 gives a moderate depth of field, 1/125 is fast enough to freeze mild motion, and ISO 200 keeps noise low. Shifting aperture to f/2.8 (2 stops brighter) requires changing shutter to 1/500 (2 stops less light) to compensate.
Aperture is measured in f-stops. Each full f-stop (f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16) halves the amount of light entering the lens. Remember: larger f-number = smaller opening = less light. This is counterintuitive but consistent.
Shutter speed doubles or halves in full stops: 1/1000, 1/500, 1/250, 1/125, 1/60, 1/30, 1/15, 1/8. Each step doubles the exposure time and doubles the light captured.
ISO follows powers of two: 100, 200, 400, 800, 1600, 3200. Each doubling amplifies the signal and the noise equally.
The triangle isn't just about getting "correct" brightness — it's about creative control. A street photographer might shoot at f/8, 1/250, ISO 400 for sharp zone focus. A portrait photographer might choose f/1.4, 1/2000, ISO 100 for dreamy bokeh background. A night photographer might use f/2.8, 30s, ISO 3200 for Milky Way shots. Same brightness, completely different visual outcomes.
Cameras measure exposure through metering systems (evaluative, center-weighted, spot). The meter suggests settings for "middle gray" (18% reflectance). Override with exposure compensation when shooting bright scenes (snow, white walls) or dark scenes (black cats, concerts) — the meter tries to make everything average gray.
A stop is a doubling or halving of light. Going from f/4 to f/5.6 is one stop less light. Going from 1/125s to 1/60s is one stop more light. Each stop doubles or halves exposure.
Yes. You can open aperture 2 stops and both increase shutter speed 1 stop AND lower ISO 1 stop. As long as the total stop changes cancel out, exposure stays the same.
Modern cameras adjust in 1/3 stops for fine control. Between f/4 and f/5.6 there are f/4.5 and f/5.0 as intermediate steps. This allows precise exposure tuning.
Depends on creative intent. For portraits, prioritize aperture (blurry background). For sports, prioritize shutter speed (freeze action). For low light, you may need higher ISO despite the noise.
If you need too much light and can't open aperture further or slow the shutter more, raise ISO. If there's too much light, use an ND filter to reduce it.
Sensor size doesn't change the exposure math, but it affects depth of field. A full-frame sensor at f/2.8 has shallower DOF than a crop sensor at f/2.8 for the same field of view.