How the calculation works
The calculator turns your word count into a page count, then into a print cost, then into two prices that actually matter: the minimum you can list without losing money on every sale, and the suggested price that leaves a real margin.
It starts with words per page. At 11-point type with standard leading on a 6×9 trade paperback, KDP manuscripts average about 275 words per page. That is not a law, but it is a useful planning constant. A 75,000-word manuscript at 275 per page is 273 pages after rounding up. A 40,000-word novella is 146 pages. A 120,000-word fantasy is 437. The same manuscript in 5×8 at a tighter leading is more pages; in 8.5×11 with larger margins it is fewer, but the calculator applies the word-to-page conversion first and handles trim as a cost multiplier rather than re-paginating.
From page count, it applies the KDP print cost formula for your chosen marketplace. Every territory has a fixed fee plus a per-page charge. In the United States the rate is $0.85 fixed plus $0.012 per page, multiplied by the trim factor for your chosen size. In the United Kingdom it is £0.70 plus £0.010 per page, multiplied by the same factor but paid in pounds. In the European Union it is €0.75 plus €0.011 per page. A 273-page book at 6×9 in the US costs $0.85 plus 273 times $0.012 times 1.15, or $4.62. The same book in the UK costs £0.70 plus 273 times £0.010 times 1.15, or £3.84. The currency is not just a label swap; the fixed and per-page rates differ, so a UK list price needs its own calculation even when the manuscript and trim are identical.
Hardcover multiplies paperback cost by about 1.4 for the same page count. That surcharge covers the case, endpapers, and the higher paper stock KDP requires for hardcovers. A $4.62 paperback becomes a $6.46 hardcover before any color adjustment. Color interiors multiply again, by roughly 2.5 times over black-and-white. A $4.62 black-and-white paperback with color interior is $11.55, which changes the entire pricing posture. The calculator applies both multipliers after the base rate so you can see the compounded cost rather than guessing whether hardcover or color moves the price more.
From print cost, the two prices fall out directly. KDP paperbacks pay 60% royalty minus print cost. The minimum price where royalty is zero is print cost divided by 0.40. A $4.62 print cost requires $11.55 to break even; a $6.46 hardcover requires $16.15. The suggested price adds a $2.00 target margin on top of the minimum and rounds up to the nearest $0.05. For a $4.62 print the suggested is $16.55; for $6.46 it is $21.20. At the suggested price, net per sale is list times 0.60 minus print cost — $5.31 on the $16.55 paperback at 32% margin, $6.26 on the $21.20 hardcover at 30% margin. The $2.00 buffer is a planning target, not a rule, but it guarantees that a sale is worth fulfilling.
Territory rate cards and currency
Do not project US dollars onto a UK or EU listing. KDP's rate cards are set per marketplace because paper, logistics, and currency differ. If you plan to sell the same book in the US and the UK, run the tool twice and keep both sheets.
The US card as of this guide is $0.85 plus $0.012 per page for standard black-and-white on white paper, with the trim factor layered on. The UK card is £0.70 plus £0.010 per page. The EU card is €0.75 plus €0.011 per page. All three shift slightly when paper type changes — cream versus white — and when page counts are very low, where the fixed fee dominates. Large trims amplify the per-page component faster than small trims, so the fixed fee matters less for a 500-page book at 8.5×11 than for a 120-page book at 5×8.
Do not convert US suggesteds at a currency rate. A $4.62 US print is £3.84 at the UK card, not £3.63 by exchange; $16.55 US suggested is £14.60 at the UK card with its own £9.60 minimum. Enter the marketplace you list in and set price in that storefront's currency.
Trim size as a cost decision, not just a design choice
Trim size multiplies cost, but it also signals genre and influences page count in ways the word-to-page constant does not capture.
A 5×8 at 1.0 is compact and cheap per page, but a 400-page 5×8 feels thicker and pricier to ship than 6×9 with fewer larger pages. 6×9 at 1.15 is the trade standard for fiction, memoir, and general nonfiction. 6.14×9.21 at 1.18 and 6.69×9.61 at 1.22 are intermediate for a distinct spine without 7×10 bulk. 7×10 at 1.30 suits workbooks and journals; 8.5×11 at 1.50 is the premium for photography, art, children's and workbooks and is most expensive per page.
Every step up in trim factor costs more for the same page count because each page uses more paper. Two books of 300 pages, one at 5×8 factor 1.0 costing $0.85 plus $3.60 or $4.45, the other at 8.5×11 factor 1.50 costing $0.85 plus $5.40 or $6.25, are the same number of pages and very different print bills. If your primary goal is margin per unit, choose the smallest trim that readers in your category already accept. Literary fiction, memoir, and practical nonfiction read well at 5.5×8.5 or 6×9; visual books and workbooks need the larger trims regardless of cost, because the page must show the content without crowding.
Do not choose trim to hit a target page count. A 546-page book at 5×8 is harder to hold and more expensive to ship than the same manuscript at 6×9 that lands at 380 pages with larger type area. Run both trims through the calculator, compare suggesteds, then check Amazon category bestseller pages for what your readers already accept. The market band matters more than the page count number.
Binding, interior, and when the surcharge is worth it
Paperback is the baseline. Hardcover adds about 40% to print cost for the same pages and opens a higher list price band where readers expect to pay more. A $4.62 paperback suggested at $16.55 and a $6.46 hardcover suggested at $21.20 are different products even when the interior is identical. If your category supports a $24.99 hardcover — history, business, memoir with gift appeal — the hardcover margin at $21.20 is strong and the paperback can serve as the price-led alternative. If your category lives at $14.99 — mass-market romance, thriller — a $21.20 hardcover may be priced off the shelf, and the paperback is the volume product.
Black-and-white interior is the baseline for text. Color multiplies print cost by roughly 2.5 times, which changes strategy. A 273-page color paperback at $4.62 black-and-white cost becomes $11.55 in color. Minimum becomes $28.87; suggested becomes about $34. The per-copy economics push you toward a premium or limited-run model: sell the color edition at a high list for readers who want it, produce the black-and-white edition for the mass of readers, or plan an offset print run for events where the color printing is cheaper at volume. Do not price a color 8.5×11 photobook at $16.99 because black-and-white novels are $16.99. The calculation exists so you see the actual cost before you set a price the market cannot support.
Paper stock interacts quietly. White at 55 or 70 gsm is standard for text; cream is slightly cheaper per page on some cards; heavyweight color for photography costs more. The tool models standard stock; for premium color request the current rate card and run the same math.
Minimum price versus suggested price versus market price
The minimum price is a floor set by arithmetic. Below it, every sale loses money before any royalties are counted. The tool reports it precisely because KDP will reject a list price that is below the floor for the marketplace, binding, trim, and color you selected. A $4.62 print needs $11.55 at 60%. A $11.55 color print needs $28.87. The minimum is not a suggestion. It is the number you cannot go below.
The suggested price is the minimum plus a $2.00 target margin, rounded up to the nearest $0.05. It guarantees that a sale is worth fulfilling and that small cost drift — a slight trim change, a paper stock substitution, a page count revision from 273 to 278 — does not turn a profitable price into a break-even one. The $2.00 is arbitrary and deliberately modest. It is enough to make the sale worthwhile but not so much that it pushes you off the market band.
Market price is what comparable titles actually sell for in your category, at your trim and binding. The correct price for your book is inside that band, at or slightly above your suggested, unless you have a clear reason to be outside it. To find the band, pull eight to twelve comparable titles in your Amazon category that share your trim size and binding. Note their print list prices. If they cluster at $14.99 to $17.99 and your suggested is $16.55, you are inside the band and the price will not draw attention for the wrong reason. If they cluster at $14.99 and your suggested is $21.20 for hardcover, either accept that hardcovers command a premium in that category and justify it with positioning, or keep the $21.20 and present the paperback at $16.55 alongside it so price-sensitive buyers have a path.
What actually moves the price most
Word count is the largest driver because it drives page count. Every 10,000 words at 275 per page is about 36 pages, which at $0.012 per page in the US is about $0.43 of print cost times the trim factor. A 40,000-word manuscript and a 150,000-word manuscript at the same trim are roughly $4.50 apart in print cost before any other multiplier. That gap carries directly into minimum and suggested. If you are writing to a price point — a $14.99 series starter, a $9.99 lead magnet in print — count words with price in mind. A tight 75,000-word book at $16.55 suggested leaves more promotional room than a sprawling 145,000-word book at $21 suggested where the category expects $16.99.
Trim is the next largest after word count. Moving 6×9 at 1.15 to 8.5×11 at 1.50 on a 300-page book lifts print from $5.05 to about $6.25 before other multipliers; genre fit matters but cost is linear if you run both.
Binding and color are step changes. Hardcover adds $1.50 to $3.00 on a typical novel; color adds $6 to $15 depending on trim and page count. Treat those as product decisions rather than cost optimizations. A hardcover that exists because the category buys hardcovers is worth the surcharge; a hardcover that exists because the file was set to hardcover is not.
Territory shifts the baseline. A book you price at $16.55 in the US may need £14.60 in the UK for the same margin. Plan the two prices separately rather than converting. Readers compare within a storefront, not across currencies, and the comparable band in pounds is the one that determines click-through at £12.99 versus £16.99.
Worked examples with the arithmetic shown
Note: the following examples are hypothetical and illustrative rather than sourced case studies.
Take a 75,000-word paperback at 6×9, black-and-white, US. The calculator estimates 273 pages as the ceiling of 75,000 divided by 275. Trim factor is 1.15. Print cost is $0.85 plus 273 times $0.012 times 1.15 equals $4.62. The 60% minimum is $4.62 divided by 0.40 equals $11.55. The suggested price is the ceiling of $4.62 plus $2.00 divided by 0.40, rounded up to the nearest $0.05, which is $16.55. At that list, royalty is $16.55 times 0.60 minus $4.62 equals $5.31, a 32% margin. That margin leaves room for a modest discount or author copies without going negative.
The same manuscript as a hardcover multiplies print by 1.4 to $6.46. Minimum becomes $16.15; suggested becomes $21.20. Royalty at suggested is $21.20 times 0.60 minus $6.46 equals $6.26, a 30% margin. The hardcover earns $0.95 more per sale even though it costs $1.84 more to print, because the higher list carries the margin. In a category where hardcovers are expected, that extra dollar per unit is why publishers maintain both bindings.
Now a large, visual book: 120,000 words at 8.5×11, color interior, paperback, US. Page count is 437 after rounding up. Trim factor is 1.50. Base print at black-and-white would be $0.85 plus 437 times $0.012 times 1.50 equals $8.71. Color multiplies by about 2.5 to $21.78. Minimum at 60% is $54.45; suggested with the $2.00 buffer is about $59.50. No mass-market paperback category supports $54 at print. The book is not viable as a low-priced paperback. The right posture is a high-list color paperback for readers who want that format, an offset print run at 1,000 units for events where unit cost drops to roughly $8 to $12, or a split where the text-only edition is black-and-white at $16 to $18 and the visual edition is premium.
Consider a short book: 40,000 words at 5×8, paperback, black-and-white, US. Pages are 146, factor 1.0, print is $0.85 plus 146 times $0.012 equals $2.60. Minimum is $6.50; suggested is $11.55. At $11.55 the margin is $4.33, or 37%. The low word count creates pricing flexibility: the book can be listed at $11.99 inside a low-price band and still carry a healthy margin, or bundled as a lead magnet at a small premium over cost for event distribution.
Finally, a UK comparison for the baseline: 75,000 words at 6×9, paperback, black-and-white, UK. Pages still 273 and factor still 1.15, but the card is £0.70 plus £0.010 per page. Print is £0.70 plus 273 times £0.010 times 1.15 equals £3.84. Minimum is £9.60; suggested is £14.60. List at £14.99 and royalty is £14.99 times 0.60 minus £3.84 equals £5.15, a 34% margin. The absolute pounds numbers are lower than the dollar numbers, but the margin structure is similar. Do not set a UK price by converting $16.55 at a currency rate; set it from the UK calculation.
Print cost by page count for the trade standard
| Word count | Est. pages | Print cost | Min. price | Suggested |
|---|---|---|---|---|
| 40,000 | 146 | $2.86 | $4.77 | $8.10 |
| 60,000 | 219 | $3.87 | $6.45 | $9.80 |
| 75,000 | 273 | $4.62 | $7.70 | $11.05 |
| 90,000 | 328 | $5.37 | $8.95 | $12.30 |
| 120,000 | 437 | $6.87 | $11.45 | $14.80 |
| 150,000 | 546 | $8.37 | $13.95 | $17.30 |
These figures are anchored to US black-and-white paperback at 6×9 for orientation. UK, EU, hardcover, color, and other trims shift them. Run your exact trim and marketplace rather than extrapolating. The table is useful to sense that a 90,000-word book and a 120,000-word book at the same trim are about $1.50 apart in print before any surcharges.
Choosing a trim for margin without fighting genre
If your primary goal is margin per unit, choose the smallest trim that readers in your category already accept. Literary fiction, memoir, and most practical nonfiction read well at 5.5×8.5 or 6×9. A 546-page book at 5×8 feels thick and costs more to ship than the same manuscript at 6×9 with fewer, larger pages. Visual books, workbooks, and children's titles need the larger trims regardless of cost, because the page must show the content. A workbook at 5×8 that forces narrow margins and small type loses more in usability than it saves in print.
Test two trims before locking files: run the same word count at 5.5×8.5 and 6×9, note suggesteds, then check which trim bestsellers in your category use. If 6×9 dominates, a $1.20 saving at 5.5×8.5 is not worth looking undersized.
Can you change the price later and how to test it
Yes, with changes live in 24 to 72 hours. The calculator models price moves without test orders: $16.55 to $14.99 on a $4.62 print drops net $5.31 to $4.37; $18.99 lifts to $6.77. Whether volume responds depends on category — a $1.56 forgone net at $14.99 may be repaid in extra units where bestsellers cluster there, while $18.99 is free margin where that price is normal.
Use price tests with eyes open. Amazon's algorithms use price as one signal among many, and frequent price changes during a launch window can confuse early sales velocity tracking. Plan a price for launch, keep it through the first 14 days of ads and category placement, then test if you have a volume hypothesis. Record print cost, suggested, actual list, units at that list, and net per sale in the same sheet where your minimum is recorded so you can see the experiment without recomputing.
Watch the 60-day payout lag — KDP pays about 60 days after sale month, so a month-one price cut pays its lower net in month three. Track both per-unit margin and cash timing.
When KDP print cost is the wrong comparison
For bookstore, library, or non-Amazon distribution, IngramSpark is the usual companion. Its per-unit cost is generally higher — a 300-page 6×9 at $5.05 on KDP might be $5.80-$6.40 on IngramSpark — but it reaches channels KDP does not. The calculator models KDP; for IngramSpark request its rate card and run the same fixed-plus-per-page math to get its higher minimum.
If you are publishing a heavily illustrated book — photography, art, children's full-bleed, or a workbook with color forms — get an offset quote at 500, 1,000, and 2,500 units. At higher page counts and large trims, offset can undercut print-on-demand even after freight, especially for a fixed print run intended for events, courses, or direct sales. A 200-page 8.5×11 color book that is $21.78 per unit on demand at single copy may be $8 to $12 at 1,000 offset, which turns an unviable low-price paperback into a profitable premium product when you control the volume. The tradeoff is capital at risk: offset requires paying for the whole run before the first sale, while print-on-demand requires none. The right choice is not a print cost debate but a cash flow one.
For short-run needs, also consider author copies from KDP. US author copies are print cost plus shipping, without the retail markup. A 300-page author copy at $5.05 plus $6 shipping is a different economics for event inventory than the retail list price suggests. The tool reports print cost as the floor regardless of channel, so author-copy math starts from the same number.
How to use the tool in under two minutes
Open the calculator and enter your manuscript word count first. Use the finished count that your typesetting file will actually contain, not the draft count before the final edit trimmed 3,000 words. The page estimate is sensitive to that last cut.
Choose binding and trim next. If you have not chosen a trim, start with 6×9 for fiction and standard nonfiction. Larger trims increase the per-page charge and push the minimum up, so compare two trims before you lock files by changing only the trim selector and noting the new suggested. The delta tells you the ongoing cost of the larger page.
Select interior. Black-and-white is the baseline for text; color is a distinct product with its own minimum. If you are unsure whether your interior qualifies as color — a few charts or a photo insert can trigger color classification — assume color for the conservative estimate and then confirm with a proof.
Pick the marketplace you actually list in. US, UK, and EU have different fixed and per-page rates and currencies. A UK listing needs the UK calculation even if the manuscript is byte-for-byte the same as the US file. Do not convert a US suggested at a currency rate; read the suggested the tool reports for that marketplace.
Read the result in order: estimated pages, print cost, minimum price, suggested price, net per sale, and margin percent. If the suggested is far from the comparable band at your trim, the right fix is usually a trim change before a margin cut. If the minimum itself is far from the band — as with an 8.5×11 color book whose minimum is above $50 — the format needs rethinking, not the price.
Final checks before you commit
Run the tool once with the numbers you plan to publish and once with a stress case where word count is 10,000 higher and trim is one step larger. If the stress suggested still sits inside the comparable band, the choice is resilient. If the stress suggested pushes outside the band, either tighten the manuscript, choose the smaller trim, or accept that this trim lives in a higher price tier by design.
Confirm that the marketplace calculation matches the storefront you will actually list in. A US calculation on a book you price in the UK storefront will always look wrong. The two suggesteds are not interchangeable.
Check that the pages estimate aligns with your interior design. The 275 words-per-page constant assumes standard density. A book with generous leading, large chapter openers, or many illustrations will have fewer words per page and more pages than estimated. If your designer projects 340 pages for a 75,000-word manuscript, use 340 as the page input sense-check and re-run with the higher count to confirm the print cost does not jump a price tier.
Bring the Marketplace, trim, binding, interior, suggested, and minimum into the same row of your launch sheet where ISBN, trim, and KDP file name live. When you revise, compare new numbers to old ones in that row rather than relying on memory that the opening is now tighter or the trim is now larger. The arithmetic is fixed; your file is the variable.