QR Code Size Calculator
How big should a QR code be on a poster, a menu or a product label? The usual rule is 10 to 1: a code scans from about ten times its width, so a code 3 cm wide scans from 30 cm. Enter the scanning distance and the length of your text, and the calculator gives the smallest width, the size of each square and the printer dots per square.
More text means a bigger, denser code with smaller squares. If the squares become too small, shorten the text (a short link helps a lot), lower the error correction level or print larger. Compare levels with the error correction tester, then make the code with the bulk QR code generator or the styling tool.
Notes
- The version (and with it the number of squares) is worked out from the text length for plain text, one byte per character. Digits-only text can be shorter, and accents or emoji take more room, so use this as a close estimate.
- The empty border (quiet zone) of 4 squares is included in the width, so the code itself is a little smaller than the number shown.
- Phones usually read squares down to about 0.25 mm in good light. Bigger is always safer.