How to use
- Choose a series — A, B, C or US.
- Choose a DPI to update the pixel column.
- Find your paper size in the table.
Options explained
- A series
- A0 has an area of one square metre and each size halves the one before, keeping a 1:√2 ratio. A4 (210 × 297 mm) is the standard office sheet outside North America.
- B and C series
- B sizes sit between A sizes and suit books and posters; C sizes are envelopes, with C4 holding an unfolded A4 sheet.
- DPI
- Dots per inch. Print usually needs 300 DPI; screens are often designed at 72 or 96.
Common sizes
| Paper | Millimetres | Pixels at 300 DPI |
|---|---|---|
| A3 | 297 × 420 | 3508 × 4961 |
| A4 | 210 × 297 | 2480 × 3508 |
| A5 | 148 × 210 | 1748 × 2480 |
| Letter | 215.9 × 279.4 | 2550 × 3300 |
| Tabloid | 279.4 × 431.8 | 3300 × 5100 |
Frequently asked questions
How many pixels is A4 at 300 DPI?
2480 × 3508 pixels. At 150 DPI it is 1240 × 1754, and at 72 DPI 595 × 842.
What is the difference between A4 and Letter?
Letter is 8.5 × 11 in (215.9 × 279.4 mm), slightly wider and shorter than A4, so check page settings when printing.
What size is Tabloid?
11 × 17 in (279.4 × 431.8 mm), close to A3 (297 × 420 mm).
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