BBC Subtitle Guidelines

BBC Subtitle Reading Speed: 160–180 Words Per Minute

The BBC measures subtitle speed differently from Netflix. Where Netflix sets a characters-per-second limit, the BBC Subtitle Guidelines recommend a reading speed of 160–180 words per minute (WPM), or 0.33 to 0.375 seconds per word, with a broadcast line length of 37 characters.

Words per minute, not characters per second

The BBC's recommended speed of 160–180 WPM works out to 0.33–0.375 seconds per word. Authoring tools compute WPM automatically and can warn when a subtitle exceeds a configured threshold. Because WPM depends on word length, it does not convert cleanly to CPS — which is exactly why the two broadcasters use different units.

The 37-character line, and its teletext origin

The BBC's 37 characters per line is tighter than Netflix's 42 and comes from teletext's fixed-width 37-column display. The two-line maximum still applies. For more on how platforms differ, see why 42 characters became the streaming standard.

Minimum time on screen

The BBC recommends leaving a subtitle up for roughly 0.3 seconds per word as a floor — for example, about 1.2 seconds for a four-word subtitle. It also cautions against treating word count as the only input: speech speed, text editing and shot synchronisation all matter. The minimum-duration reference explains the floor rules across broadcasters.

Putting it into practice

If a BBC-style delivery is what you need, convert the recommended rate into per-cue timing in your editor. You can also paste the file into the subtitle reading speed checker and set a custom threshold to review each cue's pace against your WPM target.