Library › Hardware › Materials & stock ·

Acrylic (PMMA) and polycarbonate sheet thickness: nominal vs actual, 1/8 in = 3 mm, 1/4 in = 5.5 mm, inch and mm (two acrylic tables, three polycarbonate listings)

What are the real thicknesses of 1/8, 3/16, 1/4, 3/8 and 1/2 inch acrylic and polycarbonate sheet in inches and millimetres? · Standard part · basis: Acme Plastics and A&C Plastics acrylic thickness tables compared row by row; Lexan 9034 listings from Aircraft Spruce, K-Mac and U.S. Plastic

Also called: acrylic sheet thickness, acrylic sheet actual thickness, 1/4 acrylic thickness mm, 1/8 acrylic 3mm, plexiglass thickness chart, cast acrylic 5.5 mm, acrylic thickness tolerance, polycarbonate sheet thickness, lexan sheet thickness, polycarbonate 1/8 inch, polycarbonate 0.093, lexan 9034 thickness, acrylic 3/16 4.5mm, acrylic sheet sizes mm to inch, pmma sheet standard thickness

Exact dimensions. True size, with no tolerance added.

sizes: 28 in table

Notes

Acrylic (PMMA) sheet sold in inch sizes is often not the inch thickness on the label: a '1/4 in' cast acrylic sheet is 5.5 mm (0.217 to 0.220 in) because cast sheet is made in metric steps; the A&C chart also lists a 6 mm / 0.236 in sheet under 1/4 in. Acme prints the thickness tolerance as ±10 % (often under 5 %), which can vary across a sheet, so design slots and pockets with the real sheet in hand.
Where the two acrylic tables disagree: 1/4 in is .217 (Acme) vs .220 (A&C), and 3/4 in is .709 vs .708, 1 in is .945 vs .944. Those are rounding of the same 5.5, 18 and 24 mm values (5.5 mm = 0.2165 in, 18 mm = 0.7087 in, 24 mm = 0.9449 in), shown as printed. Acme also lists 0.06 / 0.08 / 0.09 / 0.098 in nominal sheets at 1.5 / 2 / 2.3 / 2.5 mm, without inch values.
Polycarbonate: three distributors list Lexan 9034 in inch nominal thicknesses (.060, .062, .093, .094, .118, .125, .188, .250, .375, plus .220 and .472 at U.S. Plastic with mm 5.5 and 12.7 printed in the product title). Unlike acrylic, the thicknesses .125, .250 and .375 are listed as such, but no distributor's tolerance statement was read, so none is claimed; polycarbonate is also sold in metric thicknesses by other makers (not read).
No STEP/STL: a sheet is a plain box. Left out: sheet widths and lengths (distributors list many; 4 × 8 ft and 48 × 96 in appear in the sources), extruded sheet (thinner tolerance differs), nylon, HDPE, UHMW, PTFE and acetal sheet (no table read).

Acrylic (PMMA) and polycarbonate sheet thickness: nominal vs actual… size chart

sheet and nominal thickness	actual mm	actual inch, Acme	actual inch, A&C / PC distributors	source
acrylic, 0.06 in	1.5	—	—	Acme
acrylic, 0.08 in	2	—	—	Acme
acrylic, 0.09 in	2.3	—	—	Acme
acrylic, 0.098 in	2.5	—	—	Acme
acrylic, 1/8 in	3	.118	.118	Acme and A&C
acrylic, 3/16 in	4.5	.177	.177	Acme and A&C
acrylic, 1/4 in	5.5	.217	.220	Acme and A&C
acrylic, 1/4 in (6 mm)	6	—	.236	A&C
acrylic, 3/8 in	9	.354	.354	Acme and A&C
acrylic, 1/2 in	12	.472	.472	Acme and A&C
acrylic, 3/4 in	18	.709	.708	Acme and A&C
acrylic, 1 in	24	.945	.944	Acme and A&C
acrylic, 1-1/4 in	30	1.18	—	Acme
acrylic, 1-1/2 in	38	1.50	—	Acme
acrylic, 2 in	50	1.97	—	Acme
acrylic, 2-1/2 in	60	2.36	—	Acme
acrylic, 3 in	75	2.95	—	Acme
polycarbonate (Lexan 9034), 0.060 in	—	—	0.060	Aircraft Spruce
polycarbonate (Lexan 9034), 0.062 in	—	—	0.062	K-Mac
polycarbonate (Lexan 9034), 0.093 in	2.4 (U.S. Plastic title)	—	0.093	U.S. Plastic; Aircraft Spruce
polycarbonate (Lexan 9034), 0.094 in	—	—	0.094	K-Mac
polycarbonate (Lexan 9034), 0.118 in	—	—	0.118	Aircraft Spruce
polycarbonate (Lexan 9034), 0.125 in	—	—	0.125	K-Mac
polycarbonate (Lexan 9034), 0.188 in	—	—	0.188	K-Mac
polycarbonate (Lexan 9034), 0.220 in	5.5 (U.S. Plastic title)	—	0.220	U.S. Plastic
polycarbonate (Lexan 9034), 0.250 in	—	—	0.250	K-Mac
polycarbonate (Lexan 9034), 0.375 in	—	—	0.375	K-Mac
polycarbonate (Lexan 9034), 0.472 in	12.7 (U.S. Plastic title)	—	0.472	U.S. Plastic

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Acme Plastics	Acrylic sheet thickness: nominal vs actual mm and inch (tolerance +/- 10%, often under 5%)	web	Publisher's page; dimensions are facts
A&C Plastics	Thickness conversion chart: nominal, decimal inch and mm for acrylic sheet	web	Publisher's page; dimensions are facts
Aircraft Spruce	Lexan polycarbonate sheet thicknesses .060, .093, .118 in	web	Publisher's page; dimensions are facts
K-Mac Plastics	Lexan 9034 sheet thicknesses .062, .094, .125, .188, .250, .375 in (48 x 96 in)	web	Publisher's page; dimensions are facts
U.S. Plastic Corp	Clear LEXAN 9034 polycarbonate sheet: 0.093 in (2.4 mm), 0.220 in (5.5 mm), 0.472 in (12.7 mm)	web	Publisher's page; dimensions are facts

Xem scan

File coming

No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.

Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.

Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=acrylic-and-polycarbonate-sheet-thickness

Schematic, not to scale.