Free QR Code Size Calculator
Figure out exactly how big to print your QR code — or how far away it'll still scan — based on the industry's 10:1 distance rule and how much data your code holds.
1. What Do You Know?
More data means more, smaller squares packed into the same code — so it needs to be printed larger to stay scannable at the same distance.
Result
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What Does a QR Code Size Calculator Do?
A QR code size calculator tells you how large to print a QR code so it reliably scans from a given distance — or, the other way around, how far away a QR code of a given size can still be scanned. Print it too small for the distance and phones will struggle or fail to focus on it; this tool takes the guesswork out.
This calculator uses the widely cited 10:1 rule — a QR code should be at least one-tenth the distance it needs to be scanned from — and adjusts for how much data the code holds, since a denser code needs more physical room per square to stay readable.
How to Use This Calculator
- Pick what you already know: the distance people will scan from, or the size you're able to print at.
- Enter the number, or tap a preset: common distances (arm's length, across a room, a storefront) and sizes (business card, poster, banner) are one tap away.
- Choose how much your QR code will encode: a plain link needs far less room than a full vCard or a paragraph of text.
- Read the result: you'll get the minimum size (or maximum distance), a real-world size comparison, and a scan-quality rating.
Why Content Length Changes the Size You Need
A QR code is a grid of small squares called modules. A short link might only need a 25×25 grid, while a full vCard or a paragraph of text can need a 70×70 grid or larger — packed into whatever size you print it at. More modules in the same space means each one is smaller, so a data-heavy code needs to be printed noticeably bigger than a simple one to stay just as scannable from the same distance.
Tips for a QR Code That Actually Scans
- Keep the content short when the print size or scan distance is fixed — link to a webpage instead of embedding a paragraph.
- Leave a quiet zone: a plain white margin around the code roughly the width of 4 modules, which most generators (including ours) add automatically.
- Use high contrast: dark code on a light background scans far more reliably than the reverse or low-contrast color pairs.
- Test before printing at scale: print one copy at actual size and scan-test it from the real distance before committing to a large print run.
Frequently Asked Questions
Is this QR code size calculator free?
Yes, completely free with no account required.
Where does the 10:1 rule come from?
It's a widely used practical guideline from QR code and signage industry resources, based on how QR modules need to appear large enough in a phone camera's frame to be read at a given distance. It's a reliable rule of thumb, not a strict law — good lighting, code quality, and camera quality can all shift the real-world result slightly.
My result says the code needs to be very large — what can I do?
Shorten what the QR code encodes (a short link instead of long text), or increase the print size. Reducing error-correction level can also make a code slightly smaller for the same data, though it makes the code marginally more sensitive to damage or dirt.
Does this account for logo overlays?
Not directly — adding a logo covers part of the code, which functions similarly to needing a higher error-correction level. If you're using our QR Code Generator With Logo, size up slightly from what this calculator suggests.
Is my data sent to a server?
No. This calculator runs entirely in your browser using JavaScript — nothing is uploaded anywhere.