Photo tools that do the maths for you

Depth of field, angles of view, stars, filters, flash, light and your photo files. Free, fast, no sign-up, and your photos never leave your computer.

Lenses & cameras

Angles, depth of field, sharpness and what your lens really does on your sensor.

How much is sharp: near and far limits, hyperfocal distance and how blurred the background gets.

See what a focal length takes in on your sensor, drawn on a scene, with the angle of view.

Full-frame equivalent focal length and aperture for every sensor size, both ways.

From which f-number stopping down starts to soften your camera's pixels.

The slowest speed for sharp handheld photos with your focal length, sensor and stabilisation.

Every camera and lens at real size in 3D: compare up to four setups and check what fits your bag.

Get the exposure right: ND filters, flash, the stars and the best light of the day.

Change one setting and see what the others must do: equivalent exposures and the EV.

Your new shutter time with 1 to 20 stops of ND, and a countdown for bulb mode.

Sunrise, sunset, golden and blue hour for any place and day, with the sun's path.

The longest exposure for pin-sharp stars, by the NPF rule and the old 500 rule.

Guide number, distance or aperture for your flash, with ISO and partial power.

How much light you lose or gain when a lamp moves closer or further away.

Interval, number of photos and clip length for a time-lapse, and the card space you need.

Look inside your photos, clean them before sharing and plan prints and memory cards.

Everything a photo knows: camera, lens, settings, date and GPS location.

Remove GPS, camera serial and other hidden data from JPEG, PNG and WebP, without re-compressing.

Read how many photos your camera has taken, from one of its photos.

How big you can print a photo, or how many pixels a print needs.

How many photos or minutes of video fit on your card.