Paper Size Converter
All standard sizes
Every size this tool knows, side by side — millimetres are each standard's own definition, inches are millimetres divided by 25.4.
| Size | Millimetres | Inches |
|---|---|---|
| A0 | 841 × 1189 mm | 33.11 × 46.81 in |
| A1 | 594 × 841 mm | 23.39 × 33.11 in |
| A2 | 420 × 594 mm | 16.54 × 23.39 in |
| A3 | 297 × 420 mm | 11.69 × 16.54 in |
| A4 | 210 × 297 mm | 8.27 × 11.69 in |
| A5 | 148 × 210 mm | 5.83 × 8.27 in |
| A6 | 105 × 148 mm | 4.13 × 5.83 in |
| Letter | 215.9 × 279.4 mm | 8.50 × 11.00 in |
| Legal | 215.9 × 355.6 mm | 8.50 × 14.00 in |
| Tabloid | 279.4 × 431.8 mm | 11.00 × 17.00 in |
How it works
This is a lookup, not a calculation: each size's millimetre dimensions come from its own published standard, ISO 216 for the eight A-series sizes and ANSI/US customary definitions for Letter, Legal and Tabloid. Inches are simply those millimetre figures divided by 25.4, the exact definition of an inch.
Frequently asked questions
Why is A4 a different size from Letter?
They come from two separate standards, not one "more correct" version of the other. The A-series is ISO 216, a metric standard used in most of the world; Letter and Legal are US customary sizes, standardised independently in the United States and a handful of other countries. Neither was derived from the other, so their dimensions simply do not line up.
How does each A-size relate to the next one?
Each size is exactly half the area of the one before it — A1 is half of A0, A2 is half of A1, and so on. That halving is done along the long edge, which is what keeps every A-size the same shape (the same width-to-height ratio) as every other one, unlike simply halving both sides.
Is Tabloid the same as Ledger?
Yes — it is the identical physical sheet, 11×17 inches, just named differently depending on which way it is oriented. "Tabloid" is the usual name for it in portrait orientation (which is how it is listed here); "Ledger" is the same sheet turned to landscape.