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QR code size for printing: a practical chart
Plan a printed QR code from the distance at which someone will scan it. A short link and clean print can stay smaller than a dense code on a rough surface.
A practical starting rule
A commonly used rule of thumb is a code width near one tenth of the scanning distance. For example, a person scanning from 40 cm suggests starting around 4 cm wide.
This is not a guaranteed minimum. More data increases density; poor light, glare, curved packaging or a low-quality print can require a larger code.
Include the quiet zone
Keep at least four module widths of clear space around every side of the code. Background graphics, borders and text should not intrude into this area.
Measure the full reserved square when laying out a card or sign, not only the dark pattern itself.
Choose a print format
SVG is useful for layout and resizing because the code remains vector artwork. A high-resolution PNG works for many common uses. PDF is convenient when you want a page with a stated print size.
Avoid stretching an exported code, converting it to a low-resolution screenshot, or applying effects that blur module edges.
In short: Use the size calculator as a planning guide and scan a physical proof before printing a batch.