Calculators — free forever, no account needed
Focus & depth of field
Depth of Field
Near/far limits, total DoF, hyperfocal distance, and a visual focus bar. Knows your exact sensor.
Open calculator →Hyperfocal Distance
Focus here and everything from half that distance to infinity is sharp — the landscape number.
Open calculator →Macro DoF
Depth of field at 1:1 and beyond — effective aperture and the exact focus-stacking step size.
Open calculator →Exposure & light
Exposure Equivalence
EV + equivalent exposures: change aperture, shutter, or ISO and keep the identical brightness.
Open calculator →ND Filter
Exact shutter time for any filter — ND2 to ND100000 — with exposure compensation built in.
Open calculator →Flash Guide Number
Solve aperture, distance, or required GN — with ISO scaling for speedlights and strobes.
Open calculator →Astro & night sky
Star Trails (500/NPF)
The max shutter time for sharp stars, using your camera's real pixel size and aperture.
Open calculator →Astro Pixel Scale
Arcseconds per pixel for any camera + lens — and the 1–2″/px sweet spot for sharp stars.
Open calculator →Field of View
Horizontal, vertical and diagonal angles for any sensor and lens — with 35 mm equivalent.
Open calculator →Video & print
Shutter Angle
The 180° rule computed: shutter angle ↔ speed for any frame rate, 24 to 120 fps.
Open calculator →Video ND Filter
Exactly how many ND stops you need for the 180° shutter in daylight — and which filter to grab.
Open calculator →Print Resolution
How big can you print? Pixels, DPI and print size — with the megapixel print chart.
Open calculator →Why ShutterMath?
🆕 Modern camera database
Most online DoF calculators stopped updating their camera lists a decade ago. Ours includes the bodies you can actually buy in 2026 — mirrorless, DSLR, and phones.
🧮 Standard, accurate formulas
Hyperfocal H = f²/(N·c) + f with the standard circle-of-confusion convention (sensor diagonal ÷ 1500). Every result is printable.
💾 Built to return
Save camera + lens setups in your browser, share result links, print cheat sheets for your bag. Your settings are there next time — no account needed.
Popular guides — reference charts & how-tos
Hyperfocal Distance Chart
Printable charts for full frame and APS-C — find your hyperfocal distance without touching a calculator.
Read guide →ND Filter Long Exposure Chart
Base exposure → final shutter time for every common filter strength.
Read guide →Exposure Triangle Explained
Aperture, shutter, ISO — what each does, how they trade off, and which to change first.
Read guide →Shutter Speed Chart
The right shutter speed for every subject — birds to waterfalls to video.
Read guide →Long Exposure Guide
Silky water and light trails: the full settings workflow with ND math.
Read guide →Low Light Settings
Noise vs blur — the ISO/shutter/aperture strategy with real EV numbers.
Read guide →Circle of Confusion Explained
What CoC means, why calculators disagree, and which standard you should use.
Read guide →Camera Sensor Sizes Compared
Full frame vs APS-C vs Micro 4/3 vs phone: dimensions, crop factors, and what changes.
Read guide →DoF for Landscape
Hyperfocal, focus stacking, and the f-stop sweet spot for maximum sharpness.
Read guide →DoF for Portraits
How much background blur do you actually need? Lens, distance, and aperture math.
Read guide →DoF for Macro
Magnification math, effective aperture, and the focus-stacking workflow.
Read guide →Astro Focus & DoF
Infinity focus done right, the f-ratio trade-off, and star-exposure rules.
Read guide →DoF for Sports
Freeze motion and keep a razor-thin sharp zone on a moving subject.
Read guide →Real Estate DoF
The f/8 rule, where to focus, and sharp interiors wall to wall.
Read guide →50mm DoF Table
Near and far limits for the most-owned lens on the planet, fully computed.
Read guide →85mm DoF Table
The portrait lens, computed: f/1.2–f/8 at every distance.
Read guide →Aperture Explained
f-stops, light, depth of field — and the best f-stop for every genre.
Read guide →Focal Length Explained
What 24/35/50/85 mm really mean, with angles of view.
Read guide →Crop Factor Explained
APS-C, M4/3 and phone equivalence — computed for real cameras.
Read guide →Frequently asked questions
Are these calculators free?
Yes — every tool on ShutterMath is free, runs entirely in your browser, and works offline once loaded. No accounts, no watermarks, no limits.
Why do results differ from other calculators?
The two usual culprits: the circle-of-confusion standard (we use the common diagonal÷1500 convention, applied from your camera's exact sensor size) and whether the formula adds the focal-length term. Our formulas are the standard published ones.
Can I print the results?
Yes. Every calculator page has a print button that produces a clean cheat sheet — just the results and the formula reference, no navigation or controls.
Do you store my data?
No. Your setups are saved only in your own browser's local storage, and we use privacy-respecting analytics to understand which tools help people. See our Privacy Policy.