How many lines per inch is normal graph paper?

This printable graph paper (also known as grid paper) features squares of various sizes, from 1 line per inch to 24 lines per inch. Variations include index lines (heavier grid lines) and the size of the paper (legal, letter, ledger, and A4).

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Keeping this in view, what size are graph paper squares?

Printable Grid Paper – Graphing Paper

It is often called “quadrille paper” or “quad paper.” The squares usually have a specific size such as 1/2 inch, 1/4 inch or 1/8 inch – which gives the paper a name such as “1/2 Inch Grid Paper.” No axes are drawn on grid paper.