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Paper & Print Calc – Envelope Fit Checker
x402
Paper & Print Calc – Envelope Fit Checker is a paid API for AI agents from paper-print-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Given a card or folded sheet's dimensions, returns which standard envelopes (#10, A2, A7, C5, DL, C6, etc.) it will fit into, along with the margin left on each side.
Price / call$0.02
Success—
StatusUnknown
How this service works
Which standard envelopes (#10, A2, A7, C5, DL, C6 and more) hold a card or folded sheet, with the margin left over.
Output
Returns an array of matching envelope names (e.g. #10, A7, C5) with their dimensions in both inches and mm, the margin per side in inches for each, the snuggest-fitting envelope, a plain-English summary verdict, reasons why certain envelopes were excluded, the total number of envelopes checked, and the clearance used.
Example use cases
Choosing envelope for a greeting card
“I'm printing greeting cards that are 5 inches wide by 7 inches tall. Which standard envelopes will fit them with at least an eighth-inch clearance on every side?”
Wedding invitation envelope sizing
“My wedding invitations fold down to 139mm wide by 99mm tall. Can you tell me which standard envelopes — like C5, DL, or C6 — they'll slip into, and which one is the snuggest fit? Use millimeters.”
Direct mail brochure envelope check
“We're doing a direct mail campaign with a tri-fold brochure that's 3.875 inches wide and 8.75 inches tall when folded. Which standard envelopes will it fit in?”
Technical details
Endpoint
GEThttps://paper-print-calc.x402tookit.com/envelope-fit?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically determine which off-the-shelf standard envelopes (#10, A2, A7, C5, DL, C6, etc.) can hold a specific card or folded sheet, including margin clearance data. Ideal for print-production workflows, stationery design tools, direct-mail campaign planning, or any scenario where you need to match a physical piece to a standard envelope size without manual lookup tables.
Side effects
- Missing required width or height query parameters returns an error
- Non-numeric width/height values cause a validation failure
- Extremely small or large dimensions outside any standard envelope range return an empty fits array
- Invalid unit value (not 'in' or 'mm') may produce unexpected behavior
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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