Free tools

Calculators for
people who film.

Aspect ratios, file sizes, recording time, crops and teleprompter timing. Free, no sign-up, works on your phone.

Guides

Start here

Find the aspect ratio of any width and height, and the new height at any width.

Estimate a video's file size from its bitrate and length.

Work out how many minutes of video fit in your free storage at a given bitrate.

See how much of a landscape frame survives when you crop it to vertical, or the reverse.

Paste a script to see roughly how long it takes to say on camera.

Con started building Music Wide Selfie in 2026 after losing the camera he filmed with every day. Read his story.