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.
AI Video Prompt Generator
Build cinematic prompts for Veo 3, Sora, Kling, Runway and Seedance — shot type, camera moves and lighting like a real DP.
Prompt Template Library
Copy-paste templates for AI video and image generation — commercials, UGC ads, portraits, storyboards.
SD Card Recording Time
How much video fits on your card? Recording time for any capacity and bitrate, with camera presets.
SRT to Text
Turn subtitles into a clean transcript — strip timestamps, merge paragraphs, download as .txt.
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.