{"uid":"cap_KIZa_5nQDIrYDN7DUqsTI","slug":"publishing-calc-full-paperback-cover-size-calculator-d80ef46a","name":"Publishing Calc: Full Paperback Cover Size Calculator","description":"Full paperback cover width and height with bleed from trim size and page count, in inches, mm and pixels.","url":"https://publishing-calc.x402tookit.com/cover-size?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["trimWidth","trimHeight","pages"],"properties":{"dpi":{"type":"number","description":"Pixels per inch for the pixel size (default 300)"},"unit":{"type":"string","description":"in (default) or mm for trim and bleed"},"bleed":{"type":"number","description":"Bleed on each outer edge in the same unit (default 0.125 in or 3.175 mm)"},"pages":{"type":"integer","description":"Total printed page count"},"paper":{"type":"string","description":"white (default), cream or color; sets spine thickness"},"trimWidth":{"type":"number","description":"Trim width of one page (inches by default)"},"trimHeight":{"type":"number","description":"Trim height of one page"},"pageThicknessIn":{"type":"number","description":"Override: inches of spine per page"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"source":{"type":["null","string"]},"bleedIn":{"type":["null","number"]},"dpiUsed":{"type":["null","number"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"inputUnit":{"type":["null","string"]},"disclaimer":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"trimWidthIn":{"type":["null","number"]},"coverWidthIn":{"type":["null","number"]},"coverWidthMm":{"type":["null","number"]},"coverWidthPx":{"type":["null","number"]},"spineWidthIn":{"type":["null","number"]},"trimHeightIn":{"type":["null","number"]},"coverHeightIn":{"type":["null","number"]},"coverHeightMm":{"type":["null","number"]},"coverHeightPx":{"type":["null","number"]},"frontXStartIn":{"type":["null","number"]},"spineXStartIn":{"type":["null","number"]}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_V98pn6X9f-jr4pSEXOp7L","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calculates full paperback cover width and height (with bleed) from trim size and page count, returning dimensions in inches, mm, and pixels.","exampleAgentPrompt":"What's the full paperback cover size for a 6x9 trim, 320-page book on white paper with standard 0.125-inch bleed? Give me the dimensions in inches, mm, and pixels at 300 DPI.","exampleUseCases":[{"title":"KDP cover file sizing for author","prompt":"I'm uploading a cover to KDP for a 5.5x8.5 paperback with 240 pages on white paper — what should the full cover dimensions be in inches and pixels at 300 DPI including bleed?"},{"title":"Graphic designer prepping print-ready cover","prompt":"I need the exact wraparound cover size in millimeters for a 6x9 book with 380 pages on cream paper and 3.175mm bleed so I can set up my InDesign document."},{"title":"Self-publisher comparing cover sizes","prompt":"Can you calculate the full cover dimensions for a 5x8 paperback with 150 pages on white paper and show me the size in inches, mm, and pixels?"}],"resultDescription":"Returns the full cover width and height (spanning front, spine, and back) in inches, millimeters, and pixels, along with the spine width in inches, the bleed value used, and the DPI setting applied. Also includes a summary string and any disclaimers or degraded-mode flags.","failureModes":["Missing required query parameters (trimWidth, trimHeight, pages) return a validation error","Non-integer page count or negative values may cause computation errors","Invalid unit value (not 'in' or 'mm') may fall back to default","Invalid paper type string falls back to white paper defaults","Very low page counts may produce unusually thin spine widths","Payment failure (x402) prevents the call from completing"],"whenToPreferThis":"Use this endpoint when you need the complete, print-ready wraparound cover dimensions for a paperback book — accounting for spine thickness, bleed, and output in multiple unit systems. It is purpose-built for self-publishing and print-on-demand workflows (KDP, IngramSpark, etc.) and handles paper-type-specific spine calculations automatically. Prefer it over manual calculation or general-purpose math tools when you need reliable, publisher-standard dimensions in inches, mm, and pixels simultaneously.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T13:12:45.850Z","isFirstParty":false,"canonicalSlug":"publishing-calc-full-paperback-cover-size-calculator-d80ef46a"}