Create an A4 or A3 document
Select the page name instead of looking up and converting its millimetre dimensions manually.
Standard paper size calculator
Convert standard paper sizes to pixels.
Choose A6 through A0, US Letter, Legal or Tabloid and get the exact millimetre, centimetre, inch and pixel dimensions for either orientation.
Instant resultsNo signupRuns in your browser
Paper size calculator
Choose a standard sheet
A4 at 300 PPI2,480 × 3,508 pxportrait orientation
- Millimetres
- 210 × 297 mm
- Centimetres
- 21 × 29.7 cm
- Inches
- 8.27 × 11.69 in
- Paper family
- ISO A-series
Add the printer’s required bleed before creating the final production document.
When to use it
Start with the result you need
This calculator is most useful when one part of the print specification is known and another needs to be checked.
Move between paper standards
Compare ISO A-series sizes with Letter, Legal and Tabloid without assuming their proportions match.
Prepare a raster canvas
Get the pixel width and height required at the resolution specified by a printer or publisher.
The calculation
How it works
Standard paper sizes define physical dimensions. Convert millimetres to inches by dividing by 25.4, then multiply by the selected PPI to calculate pixels.
Metric results can round to the nearest whole pixel. These values describe the final sheet before any production bleed is added.
Quick reference
Standard sheets at 300 PPI
Pixel values are rounded to the nearest whole number and exclude bleed.
| Paper | Millimetres | Inches | Pixels at 300 PPI |
|---|---|---|---|
| A6 | 105 × 148 | 4.13 × 5.83 | 1240 × 1748 |
| A5 | 148 × 210 | 5.83 × 8.27 | 1748 × 2480 |
| A4 | 210 × 297 | 8.27 × 11.69 | 2480 × 3508 |
| A3 | 297 × 420 | 11.69 × 16.54 | 3508 × 4961 |
| US Letter | 215.9 × 279.4 | 8.5 × 11 | 2550 × 3300 |
| Tabloid | 279.4 × 431.8 | 11 × 17 | 3300 × 5100 |
Orientation swaps width and height but does not change the sheet area.
Check the numbers
A4 portrait at 300 PPI
The finished page is approximately 2480 × 3508 pixels before bleed.
US Letter at 300 PPI
An 8.5 × 11 inch page requires exactly 2550 × 3300 pixels.
A3 at 150 PPI
The finished sheet is approximately 1754 × 2480 pixels, useful when a lower production target is appropriate.
Before you export
Common mistakes to avoid
Assuming A4 equals Letter
They differ in both dimensions and aspect ratio, so layouts can reflow or crop when moved between them.
Using pixels without a PPI target
A physical paper size does not have one fixed pixel size. Resolution must be part of the specification.
Forgetting the production canvas
The standard sheet is the trim size. Edge-to-edge artwork may need a larger document with bleed.
Convert standard paper sizes to pixels. FAQ
How many pixels is A4?
At 300 PPI, A4 is approximately 2480 × 3508 pixels. At other resolutions, the pixel dimensions change.
Why are metric pixel values rounded?
PPI is measured per inch, so millimetres are converted through 25.4 mm per inch and the result is rounded to a whole pixel.
Does landscape require different pixels?
It uses the same two values in the opposite order. A4 landscape at 300 PPI is approximately 3508 × 2480 pixels.
Reviewed for accuracy: 28 July 2026