Convert and calculate timecodes across frame rates and time expressions used in TTML
Timecode Calculator
OOONA’s Timecode Calculator is a free online tool for anyone who works with video and subtitles in broadcast, post-production or localization. It lets you instantly convert between time representations, perform timecode arithmetic, and verify values — all without leaving your browser or reaching for a spreadsheet.
No Installation Required
The tool runs directly in your browser. Nothing to download or configure.Multiple Formats at Once
View all time format equivalents in a single view: SMPTE timecode, media time, frames and milliseconds.Timecode Math
Add and subtract timecodes to calculate offsets and durations quickly and accurately.Broad Frame Rate Support
Covers all common broadcast and cinema standards: 23.976, 24, 25, 29.97 (drop-frame and non-drop-frame TC), 30, 50, and 59.94, and custom frame rates.Built for Professionals
Designed for subtitlers, captioners, localization and accessibility teams, and broadcast engineers.
Support
Timecode Calculator is part of the growing collection of free tools provided by OOONA to support the subtitling and media localization community. We hope it becomes an effective part of your workflow, for converting time values, verifying timecode data when reviewing timed text assets, and eliminating the risk of manual calculation errors. All Timed Text Lab tools are actively maintained and improved.
