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Paper
Option A
Option B
The verdict
A4 is 3% bigger than Letter by area.
A4: 62,370 mm² · Letter: 60,264 mm².
How many fit
You can cut about 1.03 × Letter out of one A4.
Roughly — real sheets have margins and grain direction.
Paper sizes, compared by area
A3 is 'one size up' from A4 — but that means exactly twice the paper. Compare A-series sizes with Letter, Legal and Tabloid by real area, and see how many of one fit on the other — handy for printing, posters, planners and office supplies.
It answers questions like 'how much bigger is A3 than A4', 'is A4 bigger than Letter' and 'how many A5s fit on an A3' — the A-series doubles in area at every step, and the calculator shows the exact ratio and percentage for any pair of sizes.
Good to know
- Each A-series step is exactly double the area: A3 = 2 × A4.
- US Letter (216 × 279 mm) is about 3% smaller than A4 (210 × 297 mm).
- One Tabloid sheet fits two Letter pages side by side.
How it works
- 1Pick the first paper size — A5 to A2, Letter, Legal or Tabloid.
- 2Pick the second one.
- 3The areas, the percentage difference and the fit ratio are calculated instantly.
- 4Use the fit ratio for printing: e.g. two A4 pages fit exactly on one A3.
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