Paper Sizes: A4, A5, Letter and More

Features

• All eleven steps of ISO A, B and C (A0–A10, B0–B10, C0–C10)
• North American sizes: Letter, Legal, Tabloid, Ledger, Executive and more
• Common ID-photo formats: 25×35, 33×48, 35×45 and 35×49 mm
• Millimetres, centimetres, inches and points (pt) for every size
• Pixel dimensions at 72, 150 and 300 DPI plus a custom DPI field, ready for design and print
• Aspect ratio (√2) and area for the ISO series
• Sizes and whole series sit in one dropdown: pick a size for its full conversion, or A / B / C for a whole series

How to use

1. Pick a size (A4, Letter, A5…) or a whole series (A / B / C) from the dropdown
2. The result appears at once: four units, pixels and area
3. Pick an entry with a size count on it, such as “A series · all 11 sizes”, to see a whole series
4. Copy any single line with its own button

FAQ

Why is A4 210×297 rather than a round number?

Because the A series is defined as one square metre of area with an aspect ratio of √2, halved at every step. Those two rules pin the dimensions down: the long side is √2 times the short one, and folding preserves the ratio. The price is a non-integer number of millimetres — the reward is that no matter how large you print or how many times you fold, the shape is the same, which is why it became the international standard.

What is A4 in pixels at 300 DPI?

2480 × 3508 pixels — the conversion most often quoted in print work (A4 is 8.27 × 11.69 inches, times 300). The tool also gives 72 and 150 DPI, which cover web images and scans.

And what is A5 in pixels?

At 300 DPI, A5 is 1748 × 2480 pixels; at 150 DPI it is 874 × 1240, and at 72 DPI 420 × 595. A5 is A4 folded in half, so its long side is the same as the short side of A4 — 2480 pixels at 300 DPI for both — which is a quick way to sanity-check the figures.

Is B5 the same B5 everyone talks about?

Careful: ISO B5 is 176×250 mm, while the Japanese JIS B5 is 182×257 mm. They are different sizes under the same name. This tool follows ISO 216; if the other side is quoting the Japanese standard, the result will be a few millimetres off, so it is worth confirming before printing.

Is anything uploaded?

No. The whole table loads with the page and the tool sends no requests, so it works offline.