Photography Calculators
Photography calculators turn the math behind exposure, depth of field, and print sizes into an exact number — no guessing, no spreadsheets, no paywall. Every calculator on this page is free forever, needs no account, and uses the real sensor specifications of 48 camera bodies. Enter your settings, get the answer, and get back to shooting.
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
The focus distance that makes everything from half that point to infinity sharp — by camera and lens.
Open calculator →Macro Depth of Field
DoF and bellows-style exposure compensation at high magnification ratios.
Open calculator →Background Blur (Bokeh)
Blur disk diameter in millimetres — how creamy your background really gets at any distance.
Open calculator →Exposure & light
Exposure Calculator
Sunny 16, EV, stops between settings, and equivalent exposures across ISO, aperture and speed.
Open calculator →ND Filter Calculator
Long-exposure shutter times for any filter strength — from 1 stop to 20 stops.
Open calculator →Which ND Filter Do I Need?
Tell it your scene and target shutter time — it tells you exactly which filter to buy.
Open calculator →Flash Guide Number
Flash power, distance and aperture — solve for any corner of the guide-number equation.
Open calculator →Shutter Angle
Convert cinematic shutter angle to shutter speed at any frame rate, and back.
Open calculator →Video ND Filter
Find the ND strength that keeps your 180° shutter at the right speed in any light.
Open calculator →Night sky
Star Trails Exposure
Max shutter time before star trails appear — NPF, 600/500/400 rules, declination-aware.
Open calculator →Moon Exposure
Looney 11 and phase adjustments — nail the moon's exposure by phase, aperture and ISO.
Open calculator →Gear & output
Field of View
Horizontal, vertical and diagonal angles for any sensor and lens combination.
Open calculator →Pixel Scale
Arc-seconds per pixel for telescopes and long lenses — the sharpness sanity check.
Open calculator →Print Resolution
What print size your pixels support at any DPI, and what DPI you really need.
Open calculator →Print Size Planner
Print-size-first: how many megapixels you need for the size you want — and does your camera have them?
Open calculator →Prefer the guided overview with charts and explanations? See all free photography calculators →