Plan a 15-minute video script with an honest timing budget
Separate narration estimates, visual holds and actual production measurements before committing to a runtime.
A 15-minute brief is a target, not proof that a script will take 15 minutes to speak. Start with a timing budget, estimate a range, and then replace assumptions with measurements. The calculations below are planning examples, not a claim about every narrator or language.
1. Reserve time that is not narration
Fifteen minutes is 900 seconds. Suppose you deliberately reserve 60 seconds for visual holds, transitions or a demonstration with no narration. That leaves 840 seconds, or 14 minutes, for speech.
Using illustrative rates of 130–160 words per minute, a fully spoken 14-minute section corresponds to 14 × 130 = 1,820 through 14 × 160 = 2,240 words. This is arithmetic under those assumptions, not an industry word-count requirement. Your own rehearsal may suggest a different range.
2. Test your actual text
Open words to minutes. Paste the current script or open a UTF-8 text file. Change the fast and slow rates to match your intended delivery. For mixed text, the tool counts non-Han word tokens and Han characters separately and uses separate rates; it is not a universal language tokenizer.
The built-in 20-word example calculates 7.5 seconds at 160 WPM and approximately 9.231 seconds at 130 WPM. The human-readable preview rounds the range to tenths of a second. The result is still an estimate. Names, numbers spoken aloud, pauses and emphasis can change the performance.
3. Make the visual plan earn its time
Create a storyboard with each passage's purpose and intended image. Ask whether the shot needs a spoken explanation, a silent moment or a different sequence. Record whether each duration is estimated or measured. A candidate archive link should have its own review record; the drawing or link does not establish that a media choice is approved.
Avoid stretching every image to fit a brief merely because the script was shorter than expected. Revisit the story and the target instead of presenting padding as evidence of value.
4. Record or synthesize a short calibration passage
Read a representative section aloud and measure it. If using a voice service, its voice and settings can affect pace; Google Cloud's speaking-rate documentation is one example of such a setting, not a service recommendation or a feature of the free estimator.
Adjust the script and assumptions from that measurement. When the voiceover is complete, use its actual duration. Then prepare captions against the actual recording; text estimates are not word alignment.
Keep the planning record clear
Download the estimate, preserve the script revision, and note the non-spoken time budget. Topicut's free calculator does not generate audio or video and does not guarantee a final runtime. Its result is available without registration; you can optionally start a project to organize a brief, script and source records.
Sources and review date
- Topicut: calculator and counting rules
- Google Cloud TTS: speaking rate configuration
- Adobe: getting started with storyboarding
- Adobe Premiere: recording voice-over
Format and product references checked October 28, 2026. Guide updated 2026-10-29.
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