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Publishing Calc: Full Paperback Cover Size Calculator
x402
Publishing Calc: Full Paperback Cover Size Calculator is a paid API for AI agents from publishing-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Calculates full paperback cover width and height (with bleed) from trim size and page count, returning dimensions in inches, mm, and pixels.
Price / call$0.02
Success—
StatusUnknown
How this service works
Full paperback cover width and height with bleed from trim size and page count, in inches, mm and pixels.
Output
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.
Example use cases
KDP cover file sizing for author
“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?”
Graphic designer prepping print-ready cover
“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.”
Self-publisher comparing cover sizes
“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?”
Technical details
Endpoint
GEThttps://publishing-calc.x402tookit.com/cover-size?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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