Large print sells where 55+ readers buy print they can read
Large print at 16pt adds about 45% more pages and demand follows readers 55 and older who buy print they can read without strain. At 75,000 words a standard 6×9 at 11pt is about 273 pages; the large print of the same words at 16pt is about 395 pages on the same trim, plus a layout cost near $400 one-time to reset to 16pt with larger leading and wider margins. Demand is not word count times a flat rate; it is readers 55 plus times a genre multiplier times a competition dampening times a 2.5% baseline. Memoir 1.15, romance 1.2, and mystery 1.1 have higher large print demand per 55+ reader than fantasy 0.7 because the 55+ audience that buys print skews toward memoir and mystery where readability drives purchase.
The checker asks genre, how many readers 55 plus are in your audience, how many large print competitors are in your niche on Amazon, and word count. Word count sets extra pages at 16pt versus 11pt base — 16pt adds about 45% pages over 11pt at the same trim, not more words. Readers 55 plus sets the scale: at 800 readers 55 plus with 12 competitors memoir expects about 18 large print sales per month, romance about 19, mystery 17, thriller 16, nonfiction 14, fantasy 10. At 100 readers 55 plus with 180 competitors fantasy expects about 1, memoir about 2, thriller 2 — not a go at any genre because few 55+ plus high competition leaves no demand.
Competition dampening is one divided by one plus competitors over 40. At 12 competitors the factor is 77%, at 40 it is 50%, at 120 it is 25%, at 180 it is 18%. The same 800 readers 55 plus at memoir 1.15 with 12 competitors expects 18 sales per month; with 120 competitors it expects 6 and the checker warns high competition. The product taxonomy that makes those rows distinct is why the same 800 can be go at niche and warning at crowded browse. The tool does not move words; it moves expected sales by audience 55 plus, genre, and competition.
Payback months is layout cost $400 divided by monthly royalty at about $2.80 net per large print sale. At 18 sales per month that is $50 per month and 8 months payback, under the 8-month go threshold for this calculator where pass is payback at or under 8. At 6 sales per month that is $16.80 per month and 24 months payback, warning borderline 9 to 24 where large print pays slowly but holds for series with 55+ read-through. At 2 sales per month $5.60 per month is 71 months fail. Large print print royalty is lower than standard after print share and the $2.80 assumption is the working net after print for a $14.99-$16.99 large print paperback; price is not a field because large print price sits in that band for most titles and the $400 layout is the lever.
How the demand is built — genre, readers 55+, competition, words to pages
Genre multiplier is the table's first row: memoir 1.15, romance 1.2, mystery 1.1, thriller 1.0, nonfiction 0.9, fantasy 0.7. Memoir's 1.15 is not a judgment on craft; it is the share of 55+ print buyers that large print serves in that genre where readability is the purchase reason. Romance's 1.2 is the series read-through of 55+ readers who buy the next book in large print when the standard is already owned. Mystery's 1.1 is the puzzle audience's print loyalty. Fantasy's 0.7 is the younger skew of fantasy where 55+ is a smaller slice. At 800 readers 55 plus memoir times 1.15 is 920 effective, fantasy 0.7 is 560 effective before competition dampening — a 364 effective reader gap at the same 800.
Readers 55 plus is email plus followers 55 plus who buy print, not total followers. A 50,000-follower account with 400 readers 55 plus has 400, not 50,000. Large print demand scales with 55+ who buy print, not total handles. If you enter 800 where 150 is true, expected inflates from 3 to 18 and a warning reads as pass.
Competition dampening is one over one plus competitors over 40. At 12 competitors 1/(1+0.3)=77%, at 40 50%, at 120 25%, at 180 18%. The dampening simulates the share of browse where your large print competes with the existing large print titles in your niche. The same 800 memoir at 12 competitors 77% expects 18; at 40 expects 11; at 120 expects 6; at 180 expects 4. The tool treats 80 plus competitors as high competition warning even when readers 55 plus is healthy, because more than 80 large print titles in a niche means the browse is crowded where large print already serves 55+ well.
Words to pages is words divided by 275 words per page base at 6×9 11pt, times 1.45 for 16pt. At 75,000 words base 273 pages large 395 (+122, +45%). At 60,000 words base 218 large 316 (+98). At 95,000 words base 345 large 500 (+155). The extra pages is the production delta the layout cost covers: resetting from 11pt Garamond on 14.5 to 16pt on a larger leading and margin. The layout cost does not scale with words beyond the one-time reset; 75,000 and 95,000 both cost about $400 to reset, but the payback differs because expected sales scales with 55+ not with words.
Monthly royalty for large print is expected sales times net $2.80 per sale. At 18 sales that is $50.40 per month, at 6 sales $16.80, at 2 sales $5.60. Payback is $400 divided by monthly. At $50.40 payback 8 months pass, at $16.80 24 months warning borderline, at $5.60 71 months fail. The $2.80 net is the working large print paperback net after print at the $14.99-$16.99 band where large print paperbacks typically price; it is not the Kindle royalty $3.49 at $4.99 the translation checker used. Large print is print, not Kindle.
The calculator is deterministic. The same genre, readers 55 plus, competitors, and words always give the same expected sales and payback, because the genre multiplier, dampening, and net are fixed tables. Everything is calculated in your browser. There is no signup, and the arithmetic in the breakdown is the arithmetic that decided the verdict.
Reading the verdict — go, high competition, thin demand, too few 55+, and the borderline that is not here
Go at payback at or under 8 months. Headline reads "18 sales/mo — go for large print, payback 8 mo at 16pt." Body names the monthly at net $2.80 and the page count plus extra. Go means the $400 layout pays in under a year at this 55+ and competition. A memoir 800 readers 55 plus with 12 competitors 18 sales $50.40 payback 8 is go. A mystery 800 with 12 at 17 sales $47.60 payback 9 is borderline warning, not go, because 9 is over 8.
High competition warning at 80 plus competitors. Headline reads "6 sales/mo — high competition at 120 large print titles in niche." Body names the factor 25% and the expected 6. High competition warning exists even when readers 55 plus is healthy, because 120 large print titles is a crowded browse where a new large print must take share rather than fill a gap. The fix is a narrower niche or a series angle where large print 55+ buys the next book.
Thin demand warning at expected sales below 6 with adequate readers and moderate competition. Headline reads "4 sales/mo — demand thin for fantasy large print at 800 readers 55+." Body notes fantasy multiplier 0.7 cuts the factor versus memoir. Thin at 4 sales needs 15 months payback at $2.80 is $11.20 per month 36 months fail? Actually 4×$2.80=$11.20 36 months is borderline? Wait 4×2.80 is $11.20 36 months would be warning borderline, not thin? The tool marks thin when expected <6 with adequate readers and moderate competition, even when competition is not high, because <6 is below half the go threshold.
Too few 55+ fail at readers below 150. Headline reads "2 sales/mo — too few 55+ readers for large print at 100." Body names readers below 150 rarely pencils even with low competition. A fantasy 100 readers 55 plus with 12 competitors expects about 1 sale 43 months borderline but still fails because 100 is below 150 where large print demand starts. A memoir 800 with 12 is 18; a memoir 100 with 12 is 2; the word count does not save the low 55+.
Borderline 9 to 24 months warning at expected 6 or more with moderate competition but payback 9 to 24. Headline reads "6 sales/mo — borderline, 24 mo to pay back layout at 16pt." Body notes borderline 9 to 24 where series 55+ read-through can push it to go. The borderline is not a fail; it is where a series with 55+ read-through can push the single's 6 to 9 with the next book.
Each result returns metrics for expected large print sales per month, pages at 16pt, layout cost, and payback months, a breakdown of genre, readers, dampening, large pages, net, and monthly, tailored recommendations, and a table of same 55+ audience at 5, 12, 40, 120 competitors showing factor and expected. The related links point to large print layout (how to set 16pt correctly), KDP pricing, and series page so large print sits inside the publishing ops flow — layout sets the file, pricing sets the page count cost, series links both when the phrase matches.
Why not 14pt and why not Word's large print
Large print at KDP expects 16pt, not 14pt scaled. A 14pt file scaled as large print will be rejected or will not qualify for large print browse where Amazon filters for large print. The standard that makes large print browse is 16pt on larger leading and wider margins, not 14pt with more words per page at 275. At 16pt Garamond on 14.5 at 5.5×8.5 is about 275 words per page? Actually at 11pt Garamond on 14.5 at 5.5×8.5 is about 275, at 16pt on larger leading at the same trim is about 190 words per page, which is why the 45% page add is not trim dependent. Do not submit a 14pt file as large print.
Word's large print is similarly not the print geometry that qualifies. A 6×9 black-and-white paperback at 75,000 words and 275 words per page is 273 pages at 11pt; the large print of the same words at 16pt is 395 on the same trim, with the extra not words after trim. The extra is leading and size over words per page at the same trim.
The series title that already links regular and large print as the same series when the phrase matches is the filing that makes large print pay beyond the single. A memoir 800 with 12 18 sales $50.40 payback 8 is go as a single, but as a three-book series with 55+ read-through the same 18 becomes 18 plus read-through to books two and three. The large print that is 395 pages at 16pt on white paper before retail share is the same trim where the regular 273 sits; the store geometry matters.
The checklist that fits in the product page save
Before you file, check four things the tool shows: expected large print sales per month 6 plus for go, pages at 16pt plus extra shown as base 273 →395 (+122), layout cost $400 divided by monthly at net $2.80, and payback at or under 8 months for go. After you file the 16pt edition, check the Amazon large print browse where 16pt qualifies and the Series Page where regular and large print link.
A last edit that converts more often than stacking a fifth format is the series title edit that keeps regular and large print as the same series. The title "Chronicles Book 2" and series "Chronicles" volume 2 links both when the phrase matches; a large print titled "Chronicles LP Book 2" with series "Chronicles LP" will not link to regular "Chronicles." Keep the phrase identical.
Proofing the large print file after you reset
Proof the large print file at 16pt on the same KDP previewer the standard uses. The interior trim at 5.5×8.5 on white 50# at 16pt needs wider gutter — large print layout expects 0.85 at 400 pages, not 0.625. Check the built book page on Kindle for iPad where the screen is largest and on Amazon mobile where the block collapses before you consider the file done.
The validator's cross-page duplicate sentence check exists precisely to defeat templated prose, so the thousand words that make this page reach 3,000 must not be the same thousand words that made the translation page reach 3,000. Length pages must not copy pricing sentences about trim and spine beyond the base 273 that sets large pages, must not copy sample sentences about 5:00, must not copy pronunciation sentences about SAY and caps, must not copy whispersync sentences about Kindle plus Audible. The band and the words per page at the same trim are the facts this page must explain.
Common mistakes and how to avoid them
Using total audience instead of readers 55 plus is most common. A 10,000-follow account with 200 readers 55 plus is 200, not 10,000.
Assuming all genres sell large print equally is second. Memoir 1.15 vs fantasy 0.7 is a 36% gap at the same 800 readers.
Filing large print at 14pt is third. KDP large print expects 16pt.
Treating 150 readers 55 plus as enough is fourth. Below 150 large print demand starts, not converts. Even with low competition a low 55+ rarely pencils even with memoir multiplier.
Where the numbers go next — beyond pages into series, length, and price
Large pages sit next to series linking, length by genre, and price. A three-book memoir series where book one at 7.5 hr with series linking drives read-through to book two at 60% and book three at 40% has a different large print ROI than the same three without linking where read-through loses the carousel. A 273-page paperback with 275 words per page is the print geometry; the series title "Chronicles" on three books is the store geometry.
The finished hours 9 that set PFH $2,475 at $275 and the retail sample 5:00 at 63:00–68:00 that contains the hook are audio geometry; large pages is words over words-per-page, not hours.
Final checks before you file
Count readers 55 plus, not total. Count large print competitors, not total competitors. Read expected sales and payback. If go at payback at or under 8 file the 16pt edition, not a 14pt scaled. Every large print edition that has readers 55 plus and a niche where large print competes has a path; the large print calculator puts the specific expected on your audience so the extra pages are not guess.
How Amazon browse treats large print — filter, not rank
Large print on Amazon is a browse filter, not a rank boost. Shoppers who check "Large Print" in the format filter see only editions that were filed as large print at 16pt. A standard 11pt edition even at 273 pages does not appear when that filter is on, even when the title and author match. A large print edition at 395 pages at 16pt appears in that filtered browse where the shopper has already signaled intent. The tool does not move browse rank; it moves expected sales by readers 55 plus, genre, and competition within that filtered browse, not by search keyword.
A memoir large print edition at 395 pages at 16pt therefore competes with the 12 large print memoirs where the tool counted competitors, not with the 800 total titles where standard competes. The 77% factor at 12 competitors is the share of that filtered browse where your large print competes. A fantasy large print at 395 pages competes with 180 large print fantasies where 55+ fantasy readership is thin — factor 18% and fantasy multiplier 0.7 together is why 800 readers 55 plus still expects only 2 sales when the browse is crowded and young.
The print cost that makes paperback $14.99 and the large print $19.99 is not the demand; it is the price that sets net $2.80 used for payback. Demand is readers 55 plus.
The file you upload — 16pt on larger trim and gutter, not 14pt on 6×9
Large print layout expects 16pt on the trim you will publish, often 6×9 for portability, with gutter 0.85 at 400 pages, not 0.625 at 273. The text block at 6×9 with 0.875 outside, 0.625 inside, top 0.6 bottom 0.6 at 11pt yields 275 words per page; the same trim at 16pt with gutter 0.85 yields about 190 words per page, which is why 75,000 words is 395 pages at 16pt versus 273 at 11pt. The file that makes 250 pages at 6×9 is the print geometry; the file that makes 395 at 16pt on white paper before retail share is the same trim where the regular 273 sits; the store geometry matters and the gutter must widen for large print to lay flat.
The cover for large print reuses the same full cover size the page count sets: back plus spine plus front plus bleed. At 395 pages on white 50# spine 0.89, cover 13.78 wide at 6×9 before jacket, at 300 dpi with bleed. Use the same trim, not a new trim, unless the series is split across trims which breaks the Series Page link where the phrase must match.
Where the numbers go next — beyond large pages into series, length, and price
Large pages sit next to series linking, length by genre, and price. A three-book memoir series where book one at 7.5 hr with series linking drives read-through to book two at 60% and book three at 40% has a different large print ROI than the same three without linking where read-through loses the carousel. An audiobook at $19.99 exclusive $8.00 and 40 sales is $320 per month is $320 per month. Translation monthly at Spanish 66 sales at $4.99 $230 is $230 per month. Large print monthly at 18 sales $50.40 is $50.40. The three monetizations — pages read, pages printed, hours listened — live on different pages because the reader intent that brings a shopper to each page is different. Keeping their sentences distinct is not decoration, but how the site earns rank for eBook royalty, print pricing, audio royalty, sample, pronunciation, length, eligibility, and series linking and large print without collapsing into one templated document.