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 →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 →Free reference charts
Free Hyperfocal Chart
Full frame, APS-C and Micro 4/3 — 14–200 mm, f/2.8–f/16.
Read chart →Free ND Exposure Chart
Base exposure → shutter time for every filter, printable.
Read chart →Free Shutter Speed Chart
The right speed for every subject — birds to waterfalls to video.
Read chart →Why is it free? (the honest answer)
ShutterMath is a small independent project. The calculators cost nothing to run (they live in your browser), and the site is funded only by optional, clearly-labeled ads — which you can decline without losing a single feature. No paywalls, no premium tiers, no selling your data, no "free trial" tricks. Free means free.
Free calculator FAQ
Which calculators are free?
All of them — the entire site. Depth of field, hyperfocal, ND filter, exposure, flash guide number, star trails, pixel scale, field of view, shutter angle, video ND, macro DoF, and print resolution. Plus the reference charts.
Is there a pro or paid version?
No. There is exactly one version, and it's free. If you see a site charging for these tools, they're charging for math that's been public domain since the 1800s.
Can I use the tools for commercial work?
Yes — use them for client shoots, print sales, anything. Your results are yours. See the terms for the fine print.