# SellerSpec > Verified print dimensions, book cover geometry and marketplace fee maths for online sellers. Every figure traced to an official source and dated. SellerSpec publishes deterministic reference data for people selling printed and digital products: print-on-demand cover geometry, standard paper dimensions, and marketplace fee schedules. Every physical dimension is stored once and every other unit is computed from it, so no two pages can disagree. Constants are traced to the organisation that publishes them and carry the date they were last checked. ## Key constants Book cover geometry (Amazon KDP paperback, verified 2026-08-08): - Spine width = page count x paper thickness per page. There is NO additive constant. A widely reproduced version of this formula adds 0.06 inches; that constant does not appear in the printer's specification and produces a cover roughly 1.5 mm too wide. - Cover width = 0.125" bleed + trim width + spine + trim width + 0.125" bleed - Cover height = 0.125" bleed + trim height + 0.125" bleed - Paper thickness per page: White 0.002252", Cream 0.0025", Standard Color 0.002252", Premium Color 0.002347" - Minimum 24 pages to print; minimum 79 pages before text may appear on the spine - Recommended resolution: 300 DPI at final size Paper (ISO 216 / ANSI): - A4 = 210 x 297 mm = 8.268 x 11.693 in = 2480 x 3508 px at 300 DPI - US Letter = 215.9 x 279.4 mm = 8.5 x 11 in = 2550 x 3300 px at 300 DPI - ISO sizes use a 1:sqrt(2) ratio, so each size halves into the next with no cropping - Content inside 190 x 254 mm prints without cropping on both A4 and US Letter Marketplace fees (each verified independently, see per-page dates): - Etsy: Listing fee $0.2, Transaction fee 6.5%, Payment processing 3% + $0.25 (verified 2026-08-08, source https://www.etsy.com/legal/fees) - eBay: Final value fee 13.6%, Per-order fee $0.4 (verified 2026-08-08, source https://www.ebay.com/help/selling/fees-credits-invoices/selling-fees) - Amazon: Referral fee 15%, Minimum referral fee $0.3 (verified 2026-08-08, source https://sellercentral.amazon.com/help/hub/reference/GTG4BAWSY39Z98i4) ## Calculators - [Book cover size calculator](https://sellerspec.com/tools/book-cover-calculator/): spine width and full wrap dimensions for any trim size, page count and paper stock - [Etsy fee calculator](https://sellerspec.com/tools/etsy-fee-calculator/): itemised fees, net payout, profit and margin - [eBay fee calculator](https://sellerspec.com/tools/ebay-fee-calculator/): itemised fees, net payout, profit and margin - [Amazon fee calculator](https://sellerspec.com/tools/amazon-fee-calculator/): itemised fees, net payout, profit and margin ## Book cover dimension tables - [5″ × 8″ covers](https://sellerspec.com/book-cover/5x8-white/): every page count on white paper; cream, standard colour and premium colour also available - [5.06″ × 7.81″ covers](https://sellerspec.com/book-cover/5-06x7-81-white/): every page count on white paper; cream, standard colour and premium colour also available - [5.25″ × 8″ covers](https://sellerspec.com/book-cover/5-25x8-white/): every page count on white paper; cream, standard colour and premium colour also available - [5.5″ × 8.5″ covers](https://sellerspec.com/book-cover/5-5x8-5-white/): every page count on white paper; cream, standard colour and premium colour also available - [6″ × 9″ covers](https://sellerspec.com/book-cover/6x9-white/): every page count on white paper; cream, standard colour and premium colour also available - [6.14″ × 9.21″ covers](https://sellerspec.com/book-cover/6-14x9-21-white/): every page count on white paper; cream, standard colour and premium colour also available - [6.69″ × 9.61″ covers](https://sellerspec.com/book-cover/6-69x9-61-white/): every page count on white paper; cream, standard colour and premium colour also available - [7″ × 10″ covers](https://sellerspec.com/book-cover/7x10-white/): every page count on white paper; cream, standard colour and premium colour also available - [7.44″ × 9.69″ covers](https://sellerspec.com/book-cover/7-44x9-69-white/): every page count on white paper; cream, standard colour and premium colour also available - [7.5″ × 9.25″ covers](https://sellerspec.com/book-cover/7-5x9-25-white/): every page count on white paper; cream, standard colour and premium colour also available - [8″ × 10″ covers](https://sellerspec.com/book-cover/8x10-white/): every page count on white paper; cream, standard colour and premium colour also available - [8.25″ × 6″ covers](https://sellerspec.com/book-cover/8-25x6-white/): every page count on white paper; cream, standard colour and premium colour also available - [8.25″ × 8.25″ covers](https://sellerspec.com/book-cover/8-25x8-25-white/): every page count on white paper; cream, standard colour and premium colour also available - [8.5″ × 8.5″ covers](https://sellerspec.com/book-cover/8-5x8-5-white/): every page count on white paper; cream, standard colour and premium colour also available - [8.5″ × 11″ covers](https://sellerspec.com/book-cover/8-5x11-white/): every page count on white paper; cream, standard colour and premium colour also available ## Paper sizes - [A0](https://sellerspec.com/paper/a0/): 841 x 1189 mm - [A1](https://sellerspec.com/paper/a1/): 594 x 841 mm - [A2](https://sellerspec.com/paper/a2/): 420 x 594 mm - [A3](https://sellerspec.com/paper/a3/): 297 x 420 mm - [A4](https://sellerspec.com/paper/a4/): 210 x 297 mm - [A5](https://sellerspec.com/paper/a5/): 148 x 210 mm - [A6](https://sellerspec.com/paper/a6/): 105 x 148 mm - [A7](https://sellerspec.com/paper/a7/): 74 x 105 mm - [A8](https://sellerspec.com/paper/a8/): 52 x 74 mm - [A9](https://sellerspec.com/paper/a9/): 37 x 52 mm - [A10](https://sellerspec.com/paper/a10/): 26 x 37 mm - [B0](https://sellerspec.com/paper/b0/): 1000 x 1414 mm - [B1](https://sellerspec.com/paper/b1/): 707 x 1000 mm - [B2](https://sellerspec.com/paper/b2/): 500 x 707 mm - [B3](https://sellerspec.com/paper/b3/): 353 x 500 mm - [B4](https://sellerspec.com/paper/b4/): 250 x 353 mm - [B5](https://sellerspec.com/paper/b5/): 176 x 250 mm - [B6](https://sellerspec.com/paper/b6/): 125 x 176 mm - [B7](https://sellerspec.com/paper/b7/): 88 x 125 mm - [B8](https://sellerspec.com/paper/b8/): 62 x 88 mm - [C4](https://sellerspec.com/paper/c4/): 229 x 324 mm - [C5](https://sellerspec.com/paper/c5/): 162 x 229 mm - [C6](https://sellerspec.com/paper/c6/): 114 x 162 mm - [DL](https://sellerspec.com/paper/dl/): 110 x 220 mm - [US Letter](https://sellerspec.com/paper/letter/): 215.9 x 279.4 mm - [US Legal](https://sellerspec.com/paper/legal/): 215.9 x 355.6 mm - [Tabloid](https://sellerspec.com/paper/tabloid/): 279.4 x 431.8 mm - [Half Letter](https://sellerspec.com/paper/half-letter/): 139.7 x 215.9 mm - [Junior Legal](https://sellerspec.com/paper/junior-legal/): 127 x 203.2 mm - [Executive](https://sellerspec.com/paper/executive/): 184.15 x 266.7 mm - [ANSI C](https://sellerspec.com/paper/ansi-c/): 431.8 x 558.8 mm - [ANSI D](https://sellerspec.com/paper/ansi-d/): 558.8 x 863.6 mm - [ANSI E](https://sellerspec.com/paper/ansi-e/): 863.6 x 1117.6 mm - [Wallet (2×3)](https://sellerspec.com/paper/photo-2x3/): 50.8 x 76.2 mm - [3.5×5 Photo](https://sellerspec.com/paper/photo-3-5x5/): 88.9 x 127 mm - [4×6 Photo](https://sellerspec.com/paper/photo-4x6/): 101.6 x 152.4 mm - [5×7 Photo](https://sellerspec.com/paper/photo-5x7/): 127 x 177.8 mm - [8×10 Photo](https://sellerspec.com/paper/photo-8x10/): 203.2 x 254 mm - [11×14 Print](https://sellerspec.com/paper/photo-11x14/): 279.4 x 355.6 mm - [12×12 Scrapbook](https://sellerspec.com/paper/photo-12x12/): 304.8 x 304.8 mm - [16×20 Print](https://sellerspec.com/paper/photo-16x20/): 406.4 x 508 mm - [18×24 Poster](https://sellerspec.com/paper/photo-18x24/): 457.2 x 609.6 mm - [24×36 Poster](https://sellerspec.com/paper/photo-24x36/): 609.6 x 914.4 mm - [Happy Planner Classic](https://sellerspec.com/paper/happy-planner-classic/): 177.8 x 234.95 mm - [Happy Planner Big](https://sellerspec.com/paper/happy-planner-big/): 215.9 x 279.4 mm - [Happy Planner Mini](https://sellerspec.com/paper/happy-planner-mini/): 120.65 x 177.8 mm - [Filofax Personal](https://sellerspec.com/paper/filofax-personal/): 95 x 171 mm - [Filofax Pocket](https://sellerspec.com/paper/filofax-pocket/): 81 x 120 mm - [Traveler's Notebook Regular](https://sellerspec.com/paper/travelers-notebook-regular/): 110 x 210 mm - [Traveler's Notebook Passport](https://sellerspec.com/paper/travelers-notebook-passport/): 89 x 124 mm - [Discbound Junior](https://sellerspec.com/paper/discbound-junior/): 139.7 x 215.9 mm ## Size comparisons - [a4 vs letter](https://sellerspec.com/paper/compare/a4-vs-letter/): exact difference, printer scaling percentage, and the safe area that fits both - [a4 vs a5](https://sellerspec.com/paper/compare/a4-vs-a5/): exact difference, printer scaling percentage, and the safe area that fits both - [a4 vs a3](https://sellerspec.com/paper/compare/a4-vs-a3/): exact difference, printer scaling percentage, and the safe area that fits both - [a5 vs half-letter](https://sellerspec.com/paper/compare/a5-vs-half-letter/): exact difference, printer scaling percentage, and the safe area that fits both - [letter vs legal](https://sellerspec.com/paper/compare/letter-vs-legal/): exact difference, printer scaling percentage, and the safe area that fits both - [a3 vs tabloid](https://sellerspec.com/paper/compare/a3-vs-tabloid/): exact difference, printer scaling percentage, and the safe area that fits both - [a5 vs b5](https://sellerspec.com/paper/compare/a5-vs-b5/): exact difference, printer scaling percentage, and the safe area that fits both - [a6 vs photo-4x6](https://sellerspec.com/paper/compare/a6-vs-photo-4x6/): exact difference, printer scaling percentage, and the safe area that fits both - [letter vs tabloid](https://sellerspec.com/paper/compare/letter-vs-tabloid/): exact difference, printer scaling percentage, and the safe area that fits both - [a4 vs b5](https://sellerspec.com/paper/compare/a4-vs-b5/): exact difference, printer scaling percentage, and the safe area that fits both - [half-letter vs happy-planner-classic](https://sellerspec.com/paper/compare/half-letter-vs-happy-planner-classic/): exact difference, printer scaling percentage, and the safe area that fits both - [a5 vs filofax-personal](https://sellerspec.com/paper/compare/a5-vs-filofax-personal/): exact difference, printer scaling percentage, and the safe area that fits both - [photo-5x7 vs photo-4x6](https://sellerspec.com/paper/compare/photo-5x7-vs-photo-4x6/): exact difference, printer scaling percentage, and the safe area that fits both - [photo-8x10 vs letter](https://sellerspec.com/paper/compare/photo-8x10-vs-letter/): exact difference, printer scaling percentage, and the safe area that fits both - [a4 vs executive](https://sellerspec.com/paper/compare/a4-vs-executive/): exact difference, printer scaling percentage, and the safe area that fits both - [b5 vs letter](https://sellerspec.com/paper/compare/b5-vs-letter/): exact difference, printer scaling percentage, and the safe area that fits both ## Marketplace fees - [Etsy fees](https://sellerspec.com/fees/etsy/): every fee itemised with worked examples - [eBay fees](https://sellerspec.com/fees/ebay/): every fee itemised with worked examples - [Amazon fees](https://sellerspec.com/fees/amazon/): every fee itemised with worked examples ## About - [Methodology](https://sellerspec.com/methodology/): how figures are sourced, computed and verified - [Data changelog](https://sellerspec.com/changelog/): every correction and re-verification, dated - [About](https://sellerspec.com/about/) Independent. Not affiliated with Amazon, Etsy, eBay or any marketplace. Data may be cited freely with attribution to sellerspec.com.