Selected paper and envelope sizes

Unpublished review draft. Written from the cited publisher sources and original calculations, last read November 8, 2026. No physical paper, notebook or printer testing. Current outbound source links are evidence, not product recommendations. Link disclosure.

Convert a listed size, locally

Nominal dimensions, short side first

Size family and labelISO A A0ISO A A1ISO A A2ISO A A3ISO A A4ISO A A5ISO A A6ISO B B0ISO B B1ISO B B2ISO B B3ISO B B4ISO B B5ISO B B6JIS B B4JIS B B5JIS B B6US sheet LetterUS sheet Tabloid / ANSI BEnvelope nominal DLEnvelope nominal C4Envelope nominal C5Envelope nominal C6Display unitMillimetersCentimetersDecimal inchesShow dimensions

A4:210 ×297 mm. The complete table below works without JavaScript.

Dimensions are listed short side first. Divide millimeters by 25.4 for inches or by 10 for centimeters. Inch displays are rounded; use the millimeter values for comparisons.

Selections are processed in this page, with no input upload, URL query, storage or analytics event. Inch displays are rounded to three decimal places; the millimeter records remain the reference values.

Selected nominal sizes

Scroll horizontally inside the table to read every source column. The table is keyboard-focusable.

Scope is A0–A6, ISO B0–B6, JIS B4–B6, Letter/Tabloid and four envelope formats. This is not a complete standard. Dimensions are normalized short side first, not a supplier's flap/opening orientation. Manufacturing tolerances, binding and internal seams are not measured.

Check a printout with physical units

Download our original A4 scale-check worksheet (PDF, 1,812 bytes) or Letter scale-check worksheet (PDF, 1,819 bytes). Match the loaded and selected paper, use Actual size/100%, print one and measure both sides of the 100 mm square between line centers. A 94 mm result means 94% on that axis, not proof the other axis is correct. PDF geometry is generated in physical units; no hardware print result is claimed. Each worksheet has a 100 mm square and a 50 mm square. Measure between line centers. Record horizontal and vertical measurements separately; a correctly sized printout does not certify your ruler or calibrate the printer. The HTML instructions describe those targets; these simple vector PDFs are not a tagged-PDF accessibility certification.

What to watch out for

• ISO B versus JIS B. Both use B5 but different dimensions. Resolve the label with both millimeter values.
• Sheet versus cover. Use actual closed-cover dimensions for a notebook or sleeve decision, plus thickness and opening clearance.
• Envelope versus interior. Nominal finished size is not guaranteed usable space, machine compatibility or postal eligibility. Opal's flap orientation is a separate specification.
• Printer scaling. Adobe Fit can shrink or enlarge. Actual size preserves scale but may crop. A whole-sheet ratio does not include the printer's nonprinting margins.

Method, exports and reuse

We independently transcribed factual nominal dimensions from the linked publishers, normalized short side first and calculated inch displays using 1inch =25.4 mm exactly. No standard text, vendor diagrams, tolerances or product tests are reproduced. Dataset version 1.0 contains 23 rows; per-row sources, checked date, scope and builder source-read scope are included.

CSV · JSON · Machine-readable endpoint. CC 0 applies to our normalized factual compilation only, not third-party source text. Original page prose and graphics are separate from that dataset waiver.

Cite: The Guide Index, “Selected paper and envelope sizes,” version 1.0, sources read November 8, 2026, canonical reference URL. This is a selected dimensional compilation, not original manufacturer research or a complete ISO/JIS standard.

Revision record: private v1 assembled November 8, 2026; independent editorial and browser review pending. No publication date is asserted.

Next tasks

• Choose a notebook for the space you actually use
• Resolve a B5 family mismatch
• Keep the content or keep the physical print size
• Compare known interior and exterior dimensions numerically

Sources and evidence

• HP worldwide paper dimensions: A4, Letter/ANSI A and ANSI B dimensions. Read November 8, 2026.
• Mojoprint ISO/JIS dimensional table: separate B-series families. Read November 8, 2026.
• Adobe page-size printing options: Fit, Actual size and Shrink oversized pages. Updated October 22, 2026; read November 8, 2026.
• NIST SP 1038: exact unit conversion (PDF): exact inch-centimeter relation. Read November 8, 2026.
• Microsoft PaperKind reference: named Letter/Tabloid dimensions and selected ISO/JIS/envelope cross-checks. Read November 8, 2026. This reference does not establish support in a particular device.

Opal's manufacturing guide: nominal C4/C5/C6/DL envelope dimensions and separate flap orientation. Read November 8, 2026. HP and Mojoprint are publisher references, not the text of the ISO standard.