ANSI/ASME Y14.1 · United States and Canada · 5 sizes
ANSI paper sizes
ANSI sizes are the US engineering-drawing sheets from ANSI/ASME Y14.1 (1995). ANSI A is Letter (8.5 × 11 in), and each step doubles the area: B is 11 × 17 in, C 17 × 22, D 22 × 34, E 34 × 44. The proportion alternates between 1:1.29 and 1:1.55.
From ANSI E (863.6 × 1,117.6 mm) to ANSI A (215.9 × 279.4 mm).
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Every size in the series
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| Size | Width × Height (mm) | Centimetres | Inches | Points | Pixels @300 dpi | Ratio |
|---|---|---|---|---|---|---|
| ANSI A Letter | 215.9 × 279.4 mm | 21.59 × 27.94 cm | 8.5 × 11 in | 612 × 792 pt | 2,550 × 3,300 px | 1:1.29 |
| ANSI B Tabloid | 279.4 × 431.8 mm | 27.94 × 43.18 cm | 11 × 17 in | 792 × 1,224 pt | 3,300 × 5,100 px | 1:1.55 |
| ANSI C | 431.8 × 558.8 mm | 43.18 × 55.88 cm | 17 × 22 in | 1,224 × 1,584 pt | 5,100 × 6,600 px | 1:1.29 |
| ANSI D | 558.8 × 863.6 mm | 55.88 × 86.36 cm | 22 × 34 in | 1,584 × 2,448 pt | 6,600 × 10,200 px | 1:1.55 |
| ANSI E | 863.6 × 1,117.6 mm | 86.36 × 111.76 cm | 34 × 44 in | 2,448 × 3,168 pt | 10,200 × 13,200 px | 1:1.29 |
Have a measurement instead of a name? Paste it into the paper size finder — it reads 210 x 297, 8.5 x 11 in or 24x36 and names the sheet.
About this series
ANSI/ASME Y14.1 is the American standard for engineering drawing sheets. It took the existing Letter sheet, called it ANSI A, and built a doubling series on top, so that a drawing can be folded or scaled to the next size down. Engineers, surveyors and plotter operators use it; architects mostly use the separate Arch series.
ANSI A is 215.9 × 279.4 mm (8.5 × 11 in). ANSI B (279.4 × 431.8 mm) is two A sheets, ANSI C (431.8 × 558.8 mm) is two B sheets, ANSI D is 558.8 × 863.6 mm and ANSI E is 863.6 × 1117.6 mm. Because Letter is not a 1:√2 rectangle, the proportion cannot stay constant: it alternates between 1:1.29 (A, C, E) and 1:1.55 (B, D). That is the main practical difference from ISO A, where every size has the same shape.
ANSI D (22 × 34 in) is the most common full-size engineering sheet, and ANSI B (11 × 17 in, also Tabloid) is the usual half-size check print. ANSI E is used for large site and assembly drawings.
The Arch series covers the same range with cleaner ratios: Arch D is 24 × 36 in against ANSI D at 22 × 34 in. Against ISO, ANSI A is close to A4, B to A3, C to A2, D to A1 and E to A0, but none match exactly.
A practical tip: because the ratio alternates, reducing ANSI D to ANSI B is a clean 50 percent, but reducing D to C is not; scale by the smaller of the two dimension ratios (64 percent) and expect uneven margins.
Questions about this series
What are the ANSI paper sizes?
ANSI A 8.5 × 11 in (215.9 × 279.4 mm), ANSI B 11 × 17 in (279.4 × 431.8 mm), ANSI C 17 × 22 in (431.8 × 558.8 mm), ANSI D 22 × 34 in (558.8 × 863.6 mm) and ANSI E 34 × 44 in (863.6 × 1117.6 mm).
Is ANSI A the same as Letter?
Yes. ANSI A is the name ANSI/ASME Y14.1 gives to the 8.5 × 11 in Letter sheet (215.9 × 279.4 mm). ANSI B is the same sheet as Tabloid or Ledger.
What is the difference between ANSI D and Arch D?
ANSI D is 22 × 34 in (558.8 × 863.6 mm). Arch D is 24 × 36 in (609.6 × 914.4 mm), 2 in larger each way. ANSI is used for engineering drawings, Arch for architectural drawings.
Which ANSI size matches A3?
ANSI B (279.4 × 431.8 mm) is the closest. A3 is 297 × 420 mm, so ANSI B is 18 mm narrower and 12 mm taller. Print A3 on ANSI B at 94 percent.