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 →Which ND Filter Do I Need?
The buying question answered: current exposure + desired shutter time → exact stops and the filter to buy.
Open →Moon Exposure Calculator
The Looney 11 rule with phase adjustments — the exact shutter for moon photos at any ISO. From photo.SE's most-viewed question.
Open →Print Size Planner
Print size + quality → megapixels required, checked against your camera. The question Reddit keeps asking.
Open →Background Blur Calculator
How much bokeh will your lens actually give? Blur disk in mm and % of frame height, for any of 48 cameras.
Open →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 →