Guide · ~5 min read
Voice-over read time calculator (from word count)
Before you record narration or tighten a 60-second ad, estimate how long the script actually takes to speak. This guide covers WPM presets, SRT-to-script workflow, and when to add pause buffer.
Why editors care about read time
Subtitle length and VO length must match the picture lock. If the script reads 45 seconds but the slot is 30, you cut lines or speed up delivery—before studio time.
WPM presets (English starting points)
| Style | WPM |
|---|---|
| Calm explainer | 120–135 |
| Standard YouTube VO | 140–155 |
| Fast social ad | 165–180 |
Use the read time estimator with these presets on pasted text. For subtitle-derived scripts, convert with SRT to text first.
Workflow with subtitles
- Export SRT → plain text (one line per cue).
- Paste into read-time tool; pick WPM.
- Compare duration to video runtime; trim dialogue or adjust pacing.
- After timing shifts, re-check with SRT time shift.
Buffer for real recordings
Add roughly 10% for breaths and retakes planning. Legal disclaimers and numbers often slow delivery—read them aloud once instead of trusting WPM alone.
How to use
- Paste script or SRT-derived plain text.
- Pick a WPM preset (or custom) matching your delivery style.
- Note total minutes; add buffer for pauses before recording.
Frequently asked questions
- What WPM should I use for voice-over read time?
- English narration often uses 130–160 WPM for clear VO. Fast promo reads may hit 170+; educational content is often 120–140 WPM.
- Does read time include pauses?
- Word-count estimators assume continuous speech. Add 5–15% buffer for breaths, B-roll cuts, and emphasis pauses.
- Can I estimate from SRT instead of a script?
- Yes—export plain text from SRT (strip timecodes) and paste into a read-time tool, or count words in the subtitle file.
- How does this help subtitle editors?
- You know if dialogue fits a 30s slot before recording VO, and whether captions will stay readable at your speaking pace.
- Is my script uploaded to a server?
- Subtitle Kit’s read-time tool runs in your browser; pasted text is not sent to our servers for calculation.