A5 (size) to mm Converter
Convert A5 (size) to mm instantly with a reference conversion table.
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How to convert A5 (size) to mm
Enter your value
Type the number of a5 (size) you want to convert into the left box. The result in mm appears instantly in the right box. You can also type into the right box to convert in the other direction.
Use the swap button
Click the ⇄ Swap button to reverse the conversion — mm to A5 (size). Your current value carries across so you don't have to re-enter anything.
About A5 (size) and mm
A5 (size) and mm are common paper measurements.
A5 = 148 × 210 mm (half an A4 sheet). The A-series works because the aspect ratio is √2 — folding any A-size in half gives the next A-size exactly. A5 is the most popular notebook size in the UK (Leuchtturm, Moleskine, Rhodia all default to A5).
Frequently asked questions
How do I convert A5 (size) to mm?
Use the calculator above to convert A5 (size) to mm instantly.
How many mm are in 1 A5 (size)?
Use the calculator above to find the exact conversion.
Is the A5 (size) to mm converter free?
Yes, the A5 (size) to mm converter is completely free with no sign-up required, no downloads, and it works offline once the page has loaded.