What is the most common graph paper size?

In metric countries, 5 mm squares are the most common school and notebook grid. In the United States, ¼ inch (quad) paper with 4 squares per inch is the usual classroom standard.

How many millimeters is ¼ inch graph paper?

¼ inch equals exactly 6.35 mm. PrintableMake’s quarter-inch templates use a 6.35 mm cell size so the printed grid matches US quad paper when printed at 100% scale.

What is engineering graph paper?

US engineering paper typically uses a ⅕ inch (0.2 in / 5.08 mm) grid, often with a green tint and a title block. Use the Engineering Paper generator or set graph paper cell size to 5.08 mm.

Should I choose mm or inch grid for printing?

Match the unit system of your work: use mm grids (2 mm, 5 mm, 10 mm) for metric math and A4/A3 paper; use inch grids (⅛, ⅕, ¼, ½) for US Letter worksheets and imperial measurements. Always print PDFs at Actual size / 100%.

Graph Paper Sizes Chart (mm / inch)

What is a graph paper sizes chart? A graph paper sizes chart lists standard grid cell sizes in millimeters and inches (for example 5 mm metric and ¼ inch US quad) so you can pick the correct printable grid.

How to make a graph paper sizes chart: Find your target cell size in the table below, note the mm and inch values, then open the linked printable and download a PDF at 100% scale.

Open graph paper generator Engineering paper (⅕ in)

Standard grid sizes

Cell size is the distance between adjacent grid lines. Print PDFs at Actual size / 100% so mm and inch measurements stay accurate.

Name	mm	inch	Squares / in	Region	Typical use	Print
1 mm	1	0.03937≈ 1/25 in	≈ 25.4	Metric	Fine technical drawing, detailed plots, miniature maps	Graph paper generator (set 1 mm)
2 mm	2	0.07874≈ 1/13 in	≈ 12.7	Metric	Fine grid math, isometric sketches, small handwriting	2 mm on A4
5 mm	5	0.19685≈ 1/5 in	≈ 5.1	Metric	Most common metric school and notebook grid	5 mm on A4
10 mm (1 cm)	10	0.3937≈ 2/5 in	≈ 2.5	Metric	Large grid for kids, posters, quick sketches	1 cm on A4
⅛ inch	3.175	0.1250.125 in (exact)	8	US / Imperial	Drafting, detailed US engineering sketches	Graph paper generator (set 3.175 mm)
⅕ inch (engineering)	5.08	0.20.2 in (exact)	5	US / Imperial	US engineering pads; often green-tinted	Engineering paper
¼ inch (quad)	6.35	0.250.25 in (exact)	4	US / Imperial	US school quad paper, coordinate grids, craft layouts	¼ inch on Letter
⅓ inch	8.4667	0.3333≈ 0.333 in	3	US / Imperial	Larger handwriting practice, simple charts	Graph paper generator (set ≈ 8.5 mm)
½ inch	12.7	0.50.5 in (exact)	2	US / Imperial	Early elementary grids, sticker charts, large drawing	Graph paper generator (set 12.7 mm)

Quick conversions

1 inch = 25.4 mm — so ¼ in = 6.35 mm and ⅕ in = 5.08 mm.
5 mm ≈ 0.197 in — close to, but not the same as, US ⅕ in engineering paper (5.08 mm).
Squares per inch = 1 ÷ cell size in inches (exact for fractional-inch grids).

Related paper tools

Customize any cell size from 1–20 mm on the graph paper generator, or try dot grid, isometric, and hexagonal paper.

FAQ

What is the most common graph paper size?: In metric countries, 5 mm squares are the most common school and notebook grid. In the United States, ¼ inch (quad) paper with 4 squares per inch is the usual classroom standard.
How many millimeters is ¼ inch graph paper?: ¼ inch equals exactly 6.35 mm. PrintableMake’s quarter-inch templates use a 6.35 mm cell size so the printed grid matches US quad paper when printed at 100% scale.
What is engineering graph paper?: US engineering paper typically uses a ⅕ inch (0.2 in / 5.08 mm) grid, often with a green tint and a title block. Use the Engineering Paper generator or set graph paper cell size to 5.08 mm.
Should I choose mm or inch grid for printing?: Match the unit system of your work: use mm grids (2 mm, 5 mm, 10 mm) for metric math and A4/A3 paper; use inch grids (⅛, ⅕, ¼, ½) for US Letter worksheets and imperial measurements. Always print PDFs at Actual size / 100%.