Comparisons
Paper size comparisons
Side-by-side guides for the size decisions that actually come up: each one has a to-scale diagram, the exact measurements in every unit, and the practical rules — scaling percentages, fold maths, which to pick when. Within the ISO family the answers are elegant (everything is a doubling); across the Atlantic they are not, which is why the A4 vs Letter guide is the longest.
If the pair you need is not here, the size converter compares any two of the 48 standard sizes and gives the scaling percentage between them.
A4 vs US Letter
The cross-Atlantic mismatch: 6 mm of width against 18 mm of height, the asymmetric 94 % / 97 % scaling rules, and the universal layout box that prints on both.
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A4 vs A5
One fold apart: A5 is an A4 halved along its long edge — the same 1:√2 shape at half the area, rounded to whole millimetres, which is why two A5 flyers sit on one A4 sheet.
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A3 vs A4
The doubling upward: A3 is two A4 sheets side by side — the basis of every A4 booklet and the poster size most office printers can almost reach.
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Tabloid vs 11 × 17
The same sheet under four names — Tabloid, Ledger, ANSI B and its own dimensions — and how it differs from the A3 it is mistaken for.
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A5 vs A6
The small formats: A6 is half an A5 (postcard vs flyer), and four A6 cards tile one A4 sheet with two clean cuts.
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