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ManyLives Book Cover Size Calculator
x402
ManyLives Book Cover Size Calculator is a paid API for AI agents from api.manylives.me, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-19).
Calculates exact pixel dimensions and physical measurements for a print-on-demand book cover, including full wrap, spine width, and bleed zones, given trim size, page count, and paper type.
Price / call$0.002
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object with full wrap dimensions in pixels, inches, and millimeters; spine width in inches and millimeters; text-safe zone guidance for spine text; page-with-bleed dimensions; inside gutter margin minimums; and arrays of any detected problems or warnings based on the inputs.
Example use cases
Self-publisher designing a paperback cover
“I'm designing a cover for my novel — it's a 6x9 trim, 320 pages, black and white interior on cream paper at 300 DPI. Can you tell me the exact full wrap pixel dimensions and spine width so I can set up my Photoshop canvas correctly?”
Children's book with full-color interior
“What should my cover canvas size be for a square children's book — 8.5x8.5 inches, 32 pages, premium color paper at 300 DPI? I need pixels and millimeters for the spine and bleed areas.”
Bulk template generation for an author services company
“I need cover dimension specs for a 5.5x8.5 trade paperback with 180 pages printed on standard color paper — please give me the full wrap size in pixels and the spine width in both inches and mm so I can build a design template.”
Technical details
Endpoint
POSThttps://api.manylives.me/paid/text/book-cover-size?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need precise, print-ready book cover dimensions — especially full wrap pixel sizes, spine widths, and bleed zones — for a given trim size, page count, and paper stock. It's ideal for AI agents helping authors or designers prepare artwork for print-on-demand platforms like KDP or IngramSpark. Prefer this over generic calculators when you need structured JSON output suitable for downstream automation or template generation.
Side effects
- Invalid trim format (must be 'WxH' string or {width, height} object) returns an error
- Unrealistic page counts may produce warnings or problems in the response arrays
- Missing required fields (pages, trim) may result in errors or incorrect defaults
- DPI values outside typical print ranges may yield unexpected pixel dimensions
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| dpi | string | optional, default 300 |
| trim | string | width x height in inches, e.g. "8.5x8.5" or {width, height} |
| pages | string | interior page count |
| paper | string | bw_white (default), bw_cream, standard_color or premium_color |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"cover": {
"full_wrap": {
"px": {
"width": 5192,
"height": 2625
},
"width": {
"in": 17.306,
"mm": 439.6
},
"height": {
"in": 8.75,
"mm": 222.3
}
},
"text_safe": {
"spine": "not allowed; keep spine text at least 0.0625\" (1.6 mm) from each spine edge"
},
"spine_width": {
"in": 0.056,
"mm": 1.4
}
},
"interior": {
"page_with_bleed": {
"width": {
"in": 8.625,
"mm": 219.1
},
"height": {
"in": 8.75,
"mm": 222.3
}
},
"inside_gutter_margin_min": {
"in": 0.375,
"mm": 9.5
}
},
"problems": [],
"warnings": []
}
}Tags
x402
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