Paper sizes
Unit conversionHow big is that paper size?
Look up A, B and C series sizes and US Letter, Legal and Tabloid in millimetres, centimetres, inches or points.
What you enter stays on your device while you use this tool. Opening a shared link sends the settings in its address to HowToolbox to prepare the page.
Which size is my paper?
A4
210 × 297 mm
A4 is 210 mm wide and 297 mm tall
A4 in other units
- Centimetres
- 21 × 29.7 cm
- Inches
- 8.27 × 11.69 in
- Points
- 595 × 842 pt
- Series
- ISO 216 A series
- Proportion
- 1 : 1.414
- Area
- 0.062 m²
What this means
- Cut or fold A4 in half across its long side and you get A5, 148 × 210 mm.
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All paper sizes
Width × height of every size, in the unit you chose. The one you picked is highlighted.
| Size | Width × height (mm) | Series |
|---|---|---|
| 4A0 | 1,682 × 2,378 mm | ISO 216 A series |
| 2A0 | 1,189 × 1,682 mm | ISO 216 A series |
| A0 | 841 × 1,189 mm | ISO 216 A series |
| A1 | 594 × 841 mm | ISO 216 A series |
| A2 | 420 × 594 mm | ISO 216 A series |
| A3 | 297 × 420 mm | ISO 216 A series |
| A4 | 210 × 297 mm | ISO 216 A series |
| A5 | 148 × 210 mm | ISO 216 A series |
| A6 | 105 × 148 mm | ISO 216 A series |
| A7 | 74 × 105 mm | ISO 216 A series |
| A8 | 52 × 74 mm | ISO 216 A series |
| A9 | 37 × 52 mm | ISO 216 A series |
| A10 | 26 × 37 mm | ISO 216 A series |
| B0 | 1,000 × 1,414 mm | ISO 216 B series |
| B1 | 707 × 1,000 mm | ISO 216 B series |
| B2 | 500 × 707 mm | ISO 216 B series |
| B3 | 353 × 500 mm | ISO 216 B series |
| B4 | 250 × 353 mm | ISO 216 B series |
| B5 | 176 × 250 mm | ISO 216 B series |
| B6 | 125 × 176 mm | ISO 216 B series |
| B7 | 88 × 125 mm | ISO 216 B series |
| B8 | 62 × 88 mm | ISO 216 B series |
| B9 | 44 × 62 mm | ISO 216 B series |
| B10 | 31 × 44 mm | ISO 216 B series |
| C0 | 917 × 1,297 mm | ISO 269 C series (envelopes) |
Look up A, B and C series sizes and US Letter, Legal and Tabloid in millimetres, centimetres, inches or points.
How to use
- Pick a paper size, such as A4 or Letter.
- Pick the unit you want: millimetres, centimetres, inches or points. The other units are listed under the result.
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How it works
Most of the world uses the ISO paper sizes. They all share one proportion: the long side is the short side times the square root of two (about 1.414). That means a sheet cut in half across its long side keeps the same shape, so A4 halves into A5, A5 into A6 and so on. A0 is defined as one square metre of paper, and each step down halves the area.
The sizes are rounded to whole millimetres: A0 is 841 × 1189 mm, so A4 is 210 × 297 mm, which is 8.27 × 11.69 inches. The B series sits between the A sizes (B0 is 1000 mm wide) and the C series, used for envelopes, sits between A and B so an A4 sheet fits a C4 envelope. North America uses its own sizes in inches: Letter is 8.5 × 11 in, Legal 8.5 × 14 in and Tabloid 11 × 17 in.
A point is 1/72 of an inch, the unit of printing and PDF. Sizes in the table are the nominal ones; printers and trimming allow a tolerance of a millimetre or two.
Frequently asked questions
What is the size of A4 in inches?
210 × 297 mm is 8.27 × 11.69 inches, or 595 × 842 points.
Is A4 the same as US Letter?
No. Letter is shorter and wider: 216 × 279 mm against 210 × 297 mm. A document laid out for one can print with a little extra margin on the other.
Why is the ratio 1 : 1.414?
Because the square root of two is the one proportion that stays the same when a sheet is cut in half, so copying A4 onto A3 or A5 needs no stretching or cropping.
What are the C sizes for?
Envelopes. A C4 envelope (229 × 324 mm) takes a flat A4 sheet, and a C5 takes A4 folded once.
Does turning a sheet sideways change its paper size?
No. Portrait and landscape use the same sheet. The size finder checks both orientations, so you can enter the two measured sides in either order.
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