Calculate Photographic Exposure,
Aperture, Shutter & Sensor ISO.
Free photography calculators: exposure settings from the triangle, depth of field, hyperfocal distance, long-exposure ND math, and star exposure rules.
Sunny 16 Rule Baseline
Direct sunlight exposure equals f/16 at 1/ISO shutter speed: the timeless photonic benchmark.
Depth of Field (DoF) Blur
Hyperfocal distance calculation to ensure tack-sharp focus from foreground rocks to infinity.
500 Rule Astrophotography
Calculate maximum shutter seconds before earth rotation causes pinpoint stars to streak into trails.
ExposureMath Calculators
Exposure Triangle Calculator
Equivalent exposures across the triangle — change one setting and see the compensation in the other two.
Depth of Field Calculator
Depth of field from focal length, aperture, and distance — plus the hyperfocal distance for landscape focus.
ND Filter Calculator
Long exposures through ND filters — base exposure to filtered shutter, in stops and seconds.
Star Exposure Calculator
Night-sky exposure — the 500 rule (and 400 for crops) for pinpoint stars, plus the Milky Way settings.
Technical Reference Guides
The exposure triangle is a budget, not a rule
Stops as currency, side effects as purchases, and why equivalent exposures are different photos.
Depth of field: the three levers and the one that matters most
Aperture, focal length, and distance — with the hyperfocal trick that landscapes run on.
12 mistakes people make with photography exposure
The recurring errors we see in photography exposure — what causes each one, and the habit that prevents it.