The math of video, done for you
Timecode, bitrates, read times, subtitle sync — the small calculations that eat up an editor's day, turned into instant tools. Built by people who work in post-production.
Timecode Calculator
Add, subtract and convert SMPTE timecode at any frame rate — with proper 29.97/59.94 drop frame handling.
Bitrate & File Size Calculator
Estimate export sizes, or find the bitrate that hits a target file size. YouTube, Twitch and 4K presets included.
Script Timer
Paste a script, get its spoken duration at voice-over pace — with 15s / 30s / 60s commercial benchmarks.
Subtitle Sync & Converter
Fix out-of-sync SRT/VTT subtitles: shift by milliseconds, retime between frame rates, convert formats.
Why FrameMath?
Every editor knows the moment: you're mid-session and need to add two timecodes, check whether a 4K export fits the delivery limit, or figure out why the subtitles drift. The answers are simple math — but doing that math by hand at 2 a.m. is how mistakes get into masters.
FrameMath is a growing set of single-purpose tools that answer those questions instantly. No accounts, no uploads, no watermarks. Every calculation runs locally in your browser, so client footage details and unreleased scripts never touch a server.
Want the theory behind the tools? Read our guides on drop frame timecode, bitrate selection, subtitle formats and more.