Free Photography Calculators
Every ShutterMath tool in one place — free forever, no sign-up, no watermarks, no limits. Accurate to the exact sensor of the camera you own, from mirrorless flagships to the phone in your pocket.
All 12 free calculators
Free Depth of Field
Near/far limits, total DoF, hyperfocal, visual focus bar — knows your exact sensor.
Open calculator →Free Hyperfocal
Focus at H and everything from half that distance to infinity is sharp.
Open calculator →Free Macro DoF
Magnification math, effective aperture, and the stacking step size.
Open calculator →Free Exposure Calculator
EV and equivalent aperture/shutter/ISO combinations — the exposure triangle, computed.
Open calculator →Free ND Filter Calculator
Exact shutter times for ND2 to ND100000, with exposure compensation.
Open calculator →Free Flash GN Calculator
Aperture, distance, or required guide number — with ISO scaling.
Open calculator →Free Star Trails Calculator
500/400/300 and NPF max exposures for sharp stars, pixel-size aware.
Open calculator →Free Pixel Scale Calculator
Arcseconds per pixel for astro setups, with the 1–2″/px sweet spot.
Open calculator →Free FOV Calculator
Angles of view for any sensor and lens, with 35 mm equivalent.
Open calculator →Free Shutter Angle Calculator
The 180° rule computed for any frame rate, 24 to 120 fps.
Open calculator →🌫️ Which ND Filter Do I Need?
Exact stops needed + filter recommendation for any desired shutter time.
Open →🌙 Moon Exposure Calculator
Looney 11 rule + phase stops — the exact shutter for moon photos.
Open →🖼️ Print Size Planner
Megapixels required for any print size, checked against your camera.
Open →🌸 Background Blur Calculator
Blur disk size in mm and % of frame height for any camera, lens and distance.
Open →Free Video ND Calculator
How many ND stops for the 180° shutter in daylight — and which filter.
Open calculator →Free Print Resolution Calculator
Megapixels → print size at any DPI, with the full printable chart.
Open calculator →