ANSI A Paper Size
ANSI A paper measures 8.5 × 11 in (215.9 × 279.4 mm). It is identical to US Letter and forms the base unit of the ANSI/ASME Y14.1 engineering series, the way A4 does for ISO drawings.
ANSI A measures 215.9 millimetres wide and 279.4 millimetres tall.
ANSI A Dimensions in Each Unit
ANSI A is 215.9 × 279.4 mm, which is 21.6 × 27.9 cm or 8.5 × 11 in. It is ANSI B cut in half.
| Unit | Width | Height | Width × height | Copy |
|---|---|---|---|---|
| Millimetres (mm) | 215.9 | 279.4 | 215.9 × 279.4 mm | |
| Centimetres (cm) | 21.6 | 27.9 | 21.6 × 27.9 cm | |
| Metres (m) | 0.216 | 0.279 | 0.216 × 0.279 m | |
| Inches (in) | 8.5 | 11 | 8.5 × 11 in | |
| Feet (ft) | 0.71 | 0.92 | 0.71 × 0.92 ft | |
| Points (pt) | 612 | 792 | 612 × 792 pt | |
| Picas (pc) | 51 | 66 | 51 × 66 pc | |
| Pixels at 72 DPI | 612 | 792 | 612 × 792 px | |
| Pixels at 150 DPI | 1275 | 1650 | 1275 × 1650 px | |
| Pixels at 300 DPI | 2550 | 3300 | 2550 × 3300 px | |
| Pixels at 600 DPI | 5100 | 6600 | 5100 × 6600 px |
Pixel counts follow from the resolution: pixels = millimetres ÷ 25.4 × DPI. More on the DPI and pixels page.
ANSI A Shape and Area
| Aspect ratio | 1 : 1.294 |
|---|---|
| Area | 0.0603 m² · 60,322 mm² |
| Diagonal | 353.1 mm · 13.9 in |
| Closest ISO size | A4 |
| Governing standard | ANSI/ASME Y14.1 |
ANSI A to Scale
ANSI A is half of ANSI B, the smallest in the US Paper Sizes. Put ANSI A next to another size in the comparison tool.
Frequently Asked Questions
Is ANSI A the same as Letter?
Yes, exactly. ANSI A is 8.5 by 11 in, the same as US Letter. The ANSI name is used on engineering drawings so the size fits an A to E series.
How does ANSI A compare with A4?
ANSI A is 216 by 279 mm. A4 is 210 by 297 mm. ANSI A is wider and shorter, so a drawing border made for one does not centre on the other.
What is ANSI A used for?
Small engineering detail drawings, reduced prints of larger sheets, and, as Letter, all day-to-day US office printing.
Which is bigger, ANSI B or ANSI A?
ANSI B is the bigger of the two, at 279.4 × 431.8 mm against 215.9 × 279.4 mm for ANSI A. It has twice the area, so two ANSI A sheets cover one ANSI B.
US Paper Sizes
✓ Dimensions per ANSI/ASME Y14.1; unit values derived by formula. Reviewed . Editorial Process →