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Free online paper size converter

Paper sizes vary by country — ISO A-series globally, ANSI letter sizes in North America. This converter shows exact dimensions in mm, cm, inches, or pixels and includes aspect.

About this calculator

How to use

  1. Select a paper size from the dropdown.
  2. Choose the unit you want to see dimensions in.
  3. Width, height, pixel dimensions, aspect ratio, orientation, and area appear instantly.
  4. Click “Share with my numbers” to copy a URL with your selection.

Standard paper sizes

NameWidth (mm)Height (mm)Width (in)Height (in)
A0841118933.1146.81
A159484123.3933.11
A242059416.5423.39
A329742011.6916.54
A42102978.2711.69
A51482105.838.27
A61051484.135.83
Letter215.9279.48.5011.00
Legal215.9355.68.5014.00
Tabloid279.4431.811.0017.00
Executive184.15266.77.2510.50
Ledger431.8279.417.0011.00
B42503539.8413.90
B51762506.939.84

Pixel conversion formula

Pixels = (mm ÷ 25.4) × DPI

At 96 dpi (standard screen): A4 width = (210 ÷ 25.4) × 96 ≈ 794 px.

For print at 300 dpi: multiply any 96 dpi value by 300/96 ≈ 3.125.

Notes

  • ISO 216 A-series sizes have an aspect ratio of √2 ≈ 1.414, so each size folds exactly in half to make the next smaller size.
  • Ledger and Tabloid are the same physical sheet; Ledger is landscape, Tabloid is portrait.
  • Source: ISO 216:2007 for A/B series; ANSI/ASME Y14.1 for US sizes.

Frequently asked

What are the dimensions of A4 paper?
A4 paper is 210 × 297 mm (8.27 × 11.69 inches, or approximately 794 × 1123 pixels at 96 dpi). It is the standard office paper size in most countries outside North America.
How does A4 compare to US Letter?
US Letter is 215.9 × 279.4 mm (8.5 × 11 inches). It is slightly wider and shorter than A4. Both are common office paper sizes but are not interchangeable when printing without margin adjustments.
What pixel dimensions should I use for A4 at 300 dpi for print?
At 300 dpi: A4 is 2480 × 3508 pixels. At 96 dpi (screen): approximately 794 × 1123 pixels. This converter shows 96 dpi values — multiply by the ratio for other DPI settings.
What is the ISO 216 paper size standard?
ISO 216 defines the A-series and B-series paper sizes. Each A-size is exactly half the area of the size above it — A5 is half of A4, A4 is half of A3. The aspect ratio is always √2 ≈ 1.414.
What is the aspect ratio of A4 paper?
The aspect ratio of A4 is √2, expressed approximately as 1.414. This is a property of all ISO 216 A-series sizes.

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