Free Calculator · Plan Before You Write

Script Length to Watch-Time Estimator

Plan video length before you start writing. Estimate runtime, retention curve, and avg view duration from script word count, delivery pace, and content type. Avoid the 18-minute trap when your script supports 8.

YouTube retention curves Type-aware ~30 sec

Your script

Word count + delivery pace + content type drive runtime + retention

Script word count

A typical 8-min YouTube video script runs 1200-1600 words at conversational pace.

Delivery pace (words/min)

Most successful creators land at 145-170 wpm. Below 130 risks pacing complaints; above 195 risks comprehension drop.

Content type

Hook strength (first 30 sec)

First 30 sec is where you lose 20-50% of viewers. Hook strength determines that drop.

B-roll / cuts density

Higher edit density correlates with retention floor lift, though with diminishing returns past medium for most niches.

Estimated avg view duration

0:00

Of 0:00 total runtime · 0% avg retention

Runtime

0:00

From word count + pace

First-30s drop

Viewers retained past intro

End-of-video drop

Viewers reaching outro

Estimated retention curve

% of viewers still watching at each minute mark

Tools that tighten the script

Most retention drop comes from script bloat that should have been cut at the outline stage. AI scripting tools surface the bloat before you record.

Descript

Edit video by editing the transcript. Catch script-bloat before you record + cut filler words after.

Try free →

Captions.ai

AI-powered teleprompter + script editor. Pace tuning + filler-word detection before delivery.

Try free →

How this estimator works

Runtime = words ÷ delivery pace (wpm). Retention curve uses YouTube's documented average curve shapes per content type from the Yang Creator Economy Report 2024 + Tubular Labs benchmarks: tutorial 60-70% floor, video essay 65-75% floor, vlog 35-50% floor, news/entertainment 30-45% floor, review 50-60% floor. Hook strength scales the first-30-second drop (strong: -20% drop, medium: -35%, weak: -50%). B-roll density adjusts the steepness of the post-intro decline. Avg view duration = integral of retention curve across runtime.

Caveat: these are population averages. Actual retention depends on niche, audience relationship, click-bait gap, content quality, and YouTube's algorithm cycle. Use as a planning floor, not a prediction. Source data: Tubular Labs benchmarks (tubularlabs.com/resources), Yang Creator Economy Report 2024 (creatoreconomy.so), TubeBuddy aggregate creator dashboards.