Paper Sizes & DPI Calculator
Compare paper sizes and calculate print pixels in seconds.
Browse ISO A/B sizes, US formats, and photo prints. Convert units and estimate pixel dimensions at any DPI.
Size lookup
Select a category and size to view dimensions in millimetres and inches.
Millimetres
210 mm × 297 mm
Inches
8.27 in × 11.69 in
Unit converter
Enter a custom size to convert between millimetres and inches.
Inches
8.27 in × 11.69 in
DPI to pixels
Calculate the pixel dimensions you need for a print size at your chosen DPI.
Pixels needed
2480 × 3508 px
Paper sizes made simple
Pick a standard size or enter a custom size to convert between millimetres and inches. Then add a DPI value to see the exact pixel dimensions you need for crisp, print‑ready files. If you already have pixels and want DPI, use the DPI Calculator.
Quick answers
Which paper sizes are included?
The calculator includes ISO A0–A10, ISO B‑series sizes, US Letter/Legal/Tabloid, and common photo sizes.
Can I convert between mm and inches?
Yes. Enter a custom size in millimetres to see the matching inches instantly.
Does this calculator include DPI?
Yes. Enter your DPI to see the pixel dimensions needed for a given print size.
What’s the difference between A4 and Letter?
A4 is 210 × 297 mm (8.27 × 11.69 in) and is standard in most countries. US Letter is 8.5 × 11 in and is common in the United States.
Is this printable only?
No. This tool is a calculator and reference; it does not generate PDFs.
When to use each size
- A4: most common worldwide for documents, planners, and worksheets.
- US Letter: standard in the United States for home and office printing.
- Legal/Tabloid: contracts, reports, and larger layouts.
- Photo sizes: prints, albums, and framed images.
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