CODEWITHSUNDEEP
qr-code
DaveAlden
DaveAlden

Reputation: 30356

Formula to calculate the max data capacity for QR codes?

I've seen in several places on the web (e.g. here and here and here) a table showing the number of characters each type of QR Code (1 to 40) can display depending on character type and EC level.

What I haven't been able to find or work out is the formula used to generate this table?

i.e. QR_Type & EC_Level & Character_Type => Max character length

I want to use this formula to work out the lowest QR type that can be used to display an input string, given a chosen EC level and by detecting the character set and string length.

Upvotes: 4

Views: 5662

Answers (1)

Sean Owen
Sean Owen

Reputation: 66886

There is no formula for it. While it follows a general trend of course which you could approximate with a simple linear function, the exact cutoffs vary a bit due to roundings in several aspects -- number of codewords in a version, number of interleaves blocks, number of EC/data blocks. If you need an exact answer you need a table.

Upvotes: 4

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