Your book will not fit on screen — that is the plan
Every book that reaches a screen is not the book on screen. It is a selection from the book. The word count and the chapter count that make a satisfying book make an impossible shooting schedule. A 75,000-word novel with 22 chapters at a blended 950 words per scene is about 79 scenes. A 90-minute feature keeps about 32. The difference — 47 scenes that must be something else — is not a flaw in the book or a failure of the film. It is the scope that must be planned before a single scene is written as a screen beat. Keep, compress, and cut are the three verbs, and the adaptation's scope is which chapters each applies to.
The mistake that loses development is to keep a little of every subplot. That keeps all the names and thins every arc until the audience remembers no whole arc. The adaptation that survives is the one that cuts one subplot entirely so that two whole arcs survive. The scope planner forces that choice by translating word count and chapter count into scenes and then into keep, compress, and cut counts for the chosen target runtime, so the choice is a number before it is a note.
Where the numbers come from — words to scenes to scope
The chain is three steps. Words divided by a blended 950 gives estimated scenes at a mixed pace. The blended 950 sits between thriller at 850 and literary at 1,400, so a mixed-shelf book lands near it. A 75,000-word manuscript is 75,000 divided by 950 equals 78.9, rounded to 79. A 120,000-word epic is 126. A 92,000-word memoir is 97. The scene counts are the same estimates the dedicated scene counter reports at its genre mids, but the planner uses a single blended 950 so the scope arithmetic stays independent of the genre pace factor that moves the runtime. The runtime and the scene count remain siblings from the same word count, not one derived from the other.
The target runtime carries a keep. Short or proof at 45 minutes keeps about 18 scenes, feature at 90 keeps about 32, long feature at 130 keeps about 48, limited or two-part at 160 keeps about 68. These are not spoken-rate estimates; they are the film beat counts a schedule expects at those clocks. A 90-minute schedule has about 32 beats; a 45-minute proof has about 18. The scope keep is the smaller of estimated scenes and target keep — the film cannot keep more scenes than the book has, so a short proof of a long book keeps 18 of 126, and a limited of a short book keeps 21 of 21 at 20,000 words.
Compress and cut split the remainder. Compress is the middle third of the remainder at 35 percent of estimated scenes — the scenes that do not survive intact but whose location or pairing survives as part of a merged beat. Cut is what remains after keep and compress. For the 75,000-word 22-chapter thriller to 90, the tool reports keep 32 of 79, compress 28, cut 19. As chapters the ratio 32 to 28 to 19 maps onto the same chapter count: keep 9 chapters, compress 8, cut 5 at 22 chapters. The numbers are proportional, not literal per-chapter labels; the actual keep, compress, and cut are names the writer attaches to specific chapters, but the counts tell the writer how many names to attach to each verb.
The act map — why the middle compresses
The breakdown reports the expected distribution of keep, compress, and cut across the three acts because the acts carry different plotting jobs.
Act one is about 25 percent of the chapters — about 5 to 6 of 22 — and is the setup. The inciting incident near 10 percent and the first plot point near 25 percent define its boundaries. Act one keeps most. Compression is light here because the audience must learn the world and the want before the complication. Cutting here feels like a missing premise; compressing here feels like a rushed setup.
Act two is about 50 percent — about 11 of 22 — and is the confrontation. The book can linger here, the film cannot. Act two is where two book chapters that share a location or a character pairing become one film beat with a montage that carries the second chapter as a line or a look. The tool marks act two as compress because the schedule must move faster where the book is allowed to meander. The compress chapters are often consecutive in act two with the same place; the merged scene carries both.
Act three is about 25 percent — about 5 to 6 of 22 — and is the resolution. The climax keeps; one subplot chapter in act three is often the cut that makes the keep possible. At a tight 90 the cut is often a late subplot whose resolution would otherwise compete with the main climax for the final minutes. At 130 or 160 that subplot can survive because the target has more keeps. The target tells the writer whether act three keeps the subplot or cuts it. The book's act three did not cut it; the scope at this target must.
The target matters to this distribution. A 45-minute proof from a 30-chapter epic at 120,000 words has heavy cut — 18 kept of 126 is 108 cut, so the breakdown shows a heavy-cut warning. The note is that the adaptation is a selection, not a cover. The limited at 160 from a 24-chapter memoir at 92,000 has keep 68 of 97, compress 29, cut 0, so the note is that the adaptation is a compression, not a selection. The scope verbs change with the target.
Worked scope with the arithmetic shown
Note: the following examples are hypothetical and illustrative rather than a sourced case study.
A 75,000-word, 22-chapter thriller to a 90-minute feature. The standard trade book to the standard feature. Words 75,000 divided by blended 950 equals 78.9, rounded to 79 est. scenes at the tool's blended pace. Target feature at 90 keeps 32, compress is 'round(79 × 0.35)' equals 28, cut is '79 − 32 − 28' equals 19. As chapters with the same proportions on 22 chapters: keep 9, compress 8, cut 5. Act one keeps 6, act two compresses 11, act three keeps or cuts 5. The product is 32 beats. The numbers are kept exactly as the tool before. The verdict is pass — keep 32 of 79, compress 28, cut 19 fits the feature window.
A 120,000-word, 30-chapter fantasy to a 45-minute short. The epic book as proof. Words 120,000 ÷ 950 = 126.3 → 126 scenes. Target proof at 45 keeps 18, compress 'round(126×0.35)=44', cut 64. As chapters on 30: keep 4, compress 10, cut 16. The heavy cut causes more scenes being cut than kept. The verdict is warning — heavy cut that must be the decision to cut the entire secondary quest. The plan reads 126 scenes, 18 where 32 would be needed. The adaptation cannot be labeled with the existing success. The length is so large that the film keep is small.
A 92,000-word, 24-chapter memoir to a 160-minute limited. The close keep. Words 92,000 ÷ 950 = 96.8 → 97 scenes. Target limited at 160 keeps 68, compress 'round(97×0.35)=34' but capped to 29 after keep, cut 0. The minimal cut is about 0 because the target keeps almost everything. The minimal remaining cut is a result. The minimal total is low approaching 0. The short length is not recorded.
Why the tool stops at counts, not names
The tool does not name which chapters to cut. It tells you how many chapters to attach to each verb and which act they likely belong to so you can name them. The count before the name is what keeps the adaptation from being a polite summary that keeps a little of every chapter. The name after the count is what makes the cut the decision rather than a number.
Common scope mistakes
The polite summary that nominally keeps a little of each subplot. A writer applying exactly a 35-55-cut that preserves all of the chosen genres is not the best possible plan. The most successful component in the cut category was the entire secondary.
Shuffling compress and keep such that the same book has the same total length with a wide spread as other genres.
Carrying the keep ratio as a variable the room can dial again.
Quoting total for a multi-part without per-part.
Final checks
Run the tool twice with two targets that bookend your ambition — 90 and 130 for a 92k book, 45 and 90 for a 120k epic. The keep changes from 32 to 48, cut from 19 to 9. The delta 14 is the subplot that kept or fell.
Read the breakdown with the genre note. The genre's pace plus target keep yields the book's minutes. For fiction thriller at 32 kept, 90. For fiction fantasy at 32, 76. The genre still matters to the minutes, not to the scope.
Compare the scope to the cover. A short film cover that sells a short tier should not promise the full book; a multi-part cover that sells an uncut total should not hide the per-part.
Run the tool once with front-matter-trimmed count — 800 to 1,200 words for fiction — and confirm the word count you quoted is the text that screens.
Engineering note — the table is the map
The table that shows the same book at different targets is the map of the cut the outline must budget. It is not a menu.
Two masters again — book and film are siblings
The book's 22 chapters and the film's 32 beats are siblings.
How long the scope pass really takes to decide
The scope question is often answered by a single showrunner with a manuscript's chapter list. The tool answers it with three numbers they can repeat: keep scenes at 18 or 32 or 48 or 68, compress as 35 percent merges, and cut as what remains. The three numbers are the note that explains why 75k 22ch thriller to 90 is 32 kept, why 120k 30ch fantasy to 45 is 18 kept with heavy cut, and why 92k 24ch memoir to 160 is 68 kept with no cut. The three numbers are also the budget that tells the writer which chapter to cut and where to split. That is the scope that survives the greenlight, not the raw chapter count the room started with.
Five traps that make the scope wrong
Estimating from a single chapter is trap one. A 22-chapter thriller that holds 79 scenes is not 22 scenes and not 22 times some constant; it is 79 units each starting where time or place changes.
Estimating scope from runtime alone is trap two. A 90-minute feature can be 32 kept of 79 or 32 kept of 126; the same 90 with more source scenes is a heavier cut. Runtime is the target; scope is the selection at that target.
Choosing target to keep more is trap three. A 45-minute proof does not keep 32 because 32 would run 90; it keeps 18. The target is the product to pitch.
Carrying the keep ratio as a variable the room can dial is trap four.
Quoting total for a multi-part without per-part is trap five.
Final pass — run the tool on main-text count
Front matter does not contain scope. Subtract the 800 to 1,200 words of front matter and the 600 to 900 of back matter that are not story scenes, and confirm the word count you quoted is the text that is kept or compressed.
A note on very episodic manuscripts above 180 scenes
A 200,000-word thriller at 950 is 211 scenes. At that count the film keep at 32 for feature is 15 percent; limited at 68 is 32 percent. At that episodic density the film cannot survive scene for scene; the adaptation is a merger where two to three book scenes become one film beat. The keep at 35 percent compress merges is still the 35 percent that is 35 percent of estimated, and the merger point is location: two short scenes that happen in the same place should become one beat that carries both turns.
Why this page sits where it does in the cluster
Book to Film needs three numbers before any blade touches outline: minutes, scenes, and scope. Minutes tells the buyer the clock; scenes tells the writers room the units; scope tells whose scenes stay. The runtime estimator supplies minutes; the scene counter supplies scenes; this planner supplies keep, compress, and cut per chapter. The three are the triad. Without scope the minutes and scenes are numbers without names.
Engineering depth — the divisor chain
Words per page is 275 at 6×9 Garamond 12 on 15.5, words per scene is 850 thriller and 1,250 fantasy at the same trim, screened words per minute is 135 spoken. The three divisors chain: words divided by 275 is pages, words divided by 950 blended is scenes, words times 0.12 divided by 135 is minutes before genre pace. The three divisors input is the same word count. The outputs are the three masters: pages, scenes, minutes. The scope is the plan that allocates the scenes to the minutes.
Engineering note — the table is the map, not the menu
The table that shows the same book at different targets — short 18 kept, feature 32, long 48, limited 68 — is the map of the cut the outline must budget. It is not a menu of targets to choose from to land an easier keep. The same manuscript does not become a short by being quoted as a short; it is a short by its selection from the book, and the keep factor at 18 or 32 records that selection. The table's four rows for 75k and for 120k are the range the writer must plan within before the outline names the chapters.
Why the verdict is pass, warning, or fail
The verdict pass means the estimate fits the chosen form without a note. Warning heavy-cut means more scenes would be cut than kept, so the adaptation is a selection where the secondary quest must be cut entirely. Warning thin-source means estimated scenes are thin for the target keep — the book has too few scenes to fill the beats without expansion. The verdict is the note the room can action, not just the minutes the spreadsheet produced. The two warnings are two different problems: too much to cut and too little to keep.
A note on very short manuscripts that expand
A 20,000-word manuscript at 950 blended is 21 scenes. Target limited at 68 keeps would want 68 kept, but the book only has 21. The tool reports warning thin-source — source is thin for this target. The adaptation will need to expand scenes rather than compress, which means inventing beats the book did not have. The scope at that thin end is not keep, compress, and cut but invent.
Cost of a chapter merged vs a subplot cut
Every chapter merged in adaptation has a location cost. Merging two thriller chapters that share a location saves a company move but costs a beat where character could have turned. Merging two fantasy chapters that cover travel and arrival saves exposition but costs texture. Cutting a subplot chapter entirely saves the most — it removes the subplot's locations and cast — but it costs the whole arc. The tool's keep, compress, and cut — 32 kept, 28 compress merges, 19 cut for the 75k thriller to 90 — keeps the cost visible as a count, not hidden as a single chapter number. The 19 cut and the 28 compress are locations not moved to, beats not turned at, and subplots not carried.
Final checks before you commit and upload
Run the tool twice with two targets that bookend your ambition — 90 and 130 for a 92k book, 45 and 90 for a 120k epic. The keep changes from 32 to 48, cut from 19 to 9. The delta 14 is the subplot that kept or fell. Read the breakdown with the genre note. Compare the scope to the cover. Run the tool once with front-matter-trimmed count — 800 to 1,200 words for fiction — and confirm the word count you quoted is the text that is scoped.
Book to Film triad — minutes, scenes, scope
Book to Film needs three numbers before any blade touches outline: minutes from the runtime estimator, scenes from the scene counter, and scope from this planner. Minutes tells the buyer the clock; scenes tells the writers room the units; scope tells whose scenes stay. The runtime is keep ratio times pace; the scene count is words divided by scene length; the scope is target keep versus scenes. Without scope the minutes and scenes are numbers without names. With scope they name the cut. The triad is the triad.
Checklist before you quote the scope
First, quote chapter count and words. Second, quote estimated scenes at 950 blended. Third, quote target runtime and its keep scenes. Fourth, quote keep, compress, and cut both as scenes and as chapters. Fifth, map to acts — act one keeps, act two compresses, act three keeps or cuts one subplot. Sixth, name the one chapter that is the cut and the one location that carries the merge. Seventh, bracket with a second target to show the delta.
Reading the genre table with the same words again
The table keeps the same word count across four targets so you can see the same manuscript at different keeps. A 75,000-word thriller at 18-kept short, 32-kept feature, 48-kept long, and 68-kept limited are the same words at four scheduled lengths. The four are within a factor of four. The same words at 120,000 span the same four keeps but the cut is heavier at the short end. The table is not a menu; it is a map.
A note on the cascade
The chain words to scenes to scope to minutes chains: words divided by 950 is scenes, target keep is beats, scenes times keep ratio is minutes before genre pace. The chain's input is the same word count. The outputs are the three masters plus the plan.