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Quarter-Inch vs 5mm Graph Paper
Quarter-inch and 5 mm graph paper look almost identical at a glance, but they are not interchangeable — one is imperial, the other metric, and the squares are slightly different sizes. This guide explains the difference, when to use each, and how to convert between them.
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The core difference
Quarter-inch (¼") graph paper has squares that are 0.25 inches on a side — exactly four squares per inch.
5 mm graph paper has squares that are 5 millimeters on a side — exactly two squares per centimeter.
¼ inch equals 6.35 mm, so a quarter-inch square is about 27% larger than a 5 mm square.
When to use quarter-inch
US classrooms and engineering pads — it is the default grid throughout North America.
Work measured in inches and feet, such as woodworking and US construction sketches.
Cross-stitch and pixel art at four stitches per inch.
When to use 5mm
Metric math, physics, and lab work where measurements are in centimeters.
European and international school notebooks, which almost universally use 5 mm.
Bullet journaling and planning at a clean half-centimeter pitch.
Converting between the two
For an exact imperial-to-metric match, use 6.35 mm spacing instead of 5 mm.
For an exact metric-to-imperial match, use 0.197 inch spacing instead of ¼ inch.
In practice most people just pick the grid that matches their measuring system rather than converting.
Which should you pick?
If your ruler reads inches, use ¼ inch. If it reads centimeters, use 5 mm.
For schoolwork, match whatever your textbook and country use.
When in doubt, the generator lets you switch between them instantly and preview both before printing.
Frequently asked questions
Is quarter-inch graph paper the same as 5mm?
No. A quarter-inch square is 6.35 mm on a side, so it is about 27% larger than a 5 mm square. They are close but not interchangeable.
How many quarter-inch squares are in an inch?
Exactly four. Each square is 0.25 inches, so four fit across one inch.
How many 5mm squares are in a centimeter?
Exactly two. Each square is 5 mm, so two fit across one centimeter.
What is the exact metric equivalent of quarter-inch graph paper?
6.35 mm. If you need an exact match to a ¼ inch grid in metric units, set the spacing to 6.35 mm.
Which one should I use for school?
Match your country and textbook. US schools use ¼ inch; most of the rest of the world uses 5 mm.