What is the screenplay page-to-screen-time ratio, and how accurate is it?

One screenplay page equals roughly one minute of screen time — so a 100-page script runs about a 100-minute film. It's a planning rule of thumb, not a precise measure: it holds well as an average across a full script, but individual pages drift — dialogue-heavy pages play longer, sparse action lines can expand into whole sequences.

The ratio works because screenplays use rigidly standardized formatting — a fixed-width font, fixed margins, and fixed spacing — so every page carries a roughly uniform amount of story. That's why feature scripts conventionally land in the 90–120 page range and produce films of roughly matching length, and why producers, schedulers, and financiers all read page count as a proxy for runtime.

How accurate it is in practice: reliable at the script level, loose at the page level. Averaged across a whole screenplay, page count tracks runtime closely enough to plan budgets and schedules around. On any single page, though, the ratio bends: a dense dialogue exchange often plays longer than a minute, while a single action line — "she fights her way out of the warehouse" — can become a three-minute sequence on screen. Directing choices, pacing, and editing move the final number, which is why teams validate timing with table reads rather than trusting the page count alone. Treat the ratio as an estimate you refine, not a measurement.

Why the ratio matters for AI filmmaking: page-to-minute conversion is how duration should be derived in any script-driven production, including AI-generated ones. When you give the invideo agent a script and ask it to generate the first five pages, you are effectively setting a five-minute duration target — the runtime comes from the script, not from a number you pick independently. The invideo agent's upfront script analysis (it builds a persistent context library of characters, locations, and plot points before generating) is what lets it map page ranges to screen time and scene content without you re-specifying either. A tool that asks you to choose a duration separately from your page count is ignoring the convention the entire industry plans around.

Watch some of these to see what works for you:

Generally films are written in a way that each page of script is about equivalent to 1 minute of screen time. So, by asking to generate the first five pages, I'm effectively asking to generate the first five minutes of the film. I don't decide the duration independently.

— a filmmaker documenting a head-to-head test of AI film agents