Paper Sizes (A, B, C and US) in mm, Inches and Pixels
Look up ISO A, B and C, JIS B, US, ANSI and Arch paper sizes in mm, cm, inches and points, plus the pixels you need at 72, 150, 300 or any DPI.
A0 has an area of 1 m²; each next size halves the area by cutting the long side, so every A size keeps the 1:√2 shape.
Pixels are rounded to the nearest whole pixel.
| Size | mm | inches | pixels |
|---|---|---|---|
| A0 | 841 × 1189 | 33.11 × 46.81 | 9933 × 14043 |
| A1 | 594 × 841 | 23.39 × 33.11 | 7016 × 9933 |
| A2 | 420 × 594 | 16.54 × 23.39 | 4961 × 7016 |
| A3 | 297 × 420 | 11.69 × 16.54 | 3508 × 4961 |
| A4 | 210 × 297 | 8.27 × 11.69 | 2480 × 3508 |
| A5 | 148 × 210 | 5.83 × 8.27 | 1748 × 2480 |
| A6 | 105 × 148 | 4.13 × 5.83 | 1240 × 1748 |
| A7 | 74 × 105 | 2.91 × 4.13 | 874 × 1240 |
| A8 | 52 × 74 | 2.05 × 2.91 | 614 × 874 |
| A9 | 37 × 52 | 1.46 × 2.05 | 437 × 614 |
| A10 | 26 × 37 | 1.02 × 1.46 | 307 × 437 |
Most of the world uses ISO 216 paper — A4 for letters, A3 for posters, A5 for notebooks — while the US and Canada use Letter, Legal and Tabloid. This lookup gives every common size in millimetres, centimetres, inches and PDF points, and works out how many pixels a design needs at the resolution you print at, so a 300 DPI A4 flyer starts at 2480 × 3508 pixels.
How to use this tool
- Pick a paper size from the ISO A, B, C, JIS B, US, ANSI or Arch series.
- Choose portrait or landscape.
- Choose the resolution: 300 DPI for print, 150 for drafts, 72 or 96 for screens — or enter your own.
- Read the size in every unit and compare the whole series in the table.
Formula
inches = mm ÷ 25.4 · points = inches × 72 · pixels = round(inches × DPI)
ISO A sizes follow A0 = 1 m² with sides in the ratio 1:√2, rounded to whole millimetres. B sizes are geometric means of neighbouring A sizes; C sizes (envelopes) are geometric means of A and B.
Example
A4 is 210 × 297 mm. In inches that is 210 ÷ 25.4 = 8.27 by 297 ÷ 25.4 = 11.69, or 595.28 × 841.89 points. At 300 DPI: 8.268 × 300 = 2480.3 → 2480 and 11.693 × 300 = 3507.9 → 3508, so 2480 × 3508 pixels (8.7 megapixels).
Frequently asked questions
Is A4 the same as Letter?
No. Letter (215.9 × 279.4 mm) is 6 mm wider and 18 mm shorter than A4 (210 × 297 mm). Documents print on either with small margin changes, but layouts made for one look slightly off on the other.
Why does my "B5" notebook not match ISO B5?
Japan uses JIS B sizes, about 3% larger: JIS B5 is 182 × 257 mm, ISO B5 is 176 × 250 mm. Korean and Japanese stationery usually means JIS B5.
What DPI should I design at?
300 DPI is the usual print standard. Large posters viewed from a distance can use 150 DPI; screens ignore DPI and use pixels.
Sources
Last updated:
Page address with these inputs: https://kakao.mobile/tools/paper-size-lookup/
Cite or embed this tool
kakaoCalc. (2026, November 8). Paper Sizes (A, B, C and US) in mm, Inches and Pixels. https://kakao.mobile/tools/paper-size-lookup/
“Paper Sizes (A, B, C and US) in mm, Inches and Pixels.” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/paper-size-lookup/.
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