# 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? - Category: Hardware › Materials & stock - Kind: 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 - Page: https://xemstudio.com/objects/acrylic-and-polycarbonate-sheet-thickness/ · JSON: https://xemstudio.com/api/geometry?object=acrylic-and-polycarbonate-sheet-thickness · Plain text: https://xemstudio.com/objects/acrylic-and-polycarbonate-sheet-thickness/sheet.txt - License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license - Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/) **Exact dimensions.** True size, with no tolerance added. ## 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). ## Sizes | 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 - Acme Plastics: [Acrylic sheet thickness: nominal vs actual mm and inch (tolerance +/- 10%, often under 5%)](https://www.acmeplastics.com/acrylic-sheets/acrylic-cast-clear-sheet) — web — Publisher's page; dimensions are facts - A&C Plastics: [Thickness conversion chart: nominal, decimal inch and mm for acrylic sheet](https://www.acplasticsinc.com/pages/thicknessconversioncharts) — web — Publisher's page; dimensions are facts - Aircraft Spruce: [Lexan polycarbonate sheet thicknesses .060, .093, .118 in](https://www.aircraftspruce.com/catalog/mepages/2024_leadedge.php) — 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)](https://kmac-distribution.com/plastics/lexan-9034-sheets.htm) — 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)](https://www.usplastic.com/catalog/item.aspx?itemid=28089) — web — Publisher's page; dimensions are facts ## Questions **How thick is 1/4 inch acrylic sheet?** 5.5 mm, i.e. 0.217 in (Acme) to 0.220 in (A&C); A&C also lists a 6 mm (0.236 in) sheet under the 1/4 in label. **How thick is 1/8 inch acrylic?** 3 mm (0.118 in). **What is the tolerance on acrylic sheet thickness?** Acme prints ±10 %, often under 5 %. **What thicknesses does Lexan 9034 polycarbonate come in?** Inch nominals read here: .060, .062, .093, .094, .118, .125, .188, .220, .250, .375 and .472. ## Fits with - [Plywood and drywall sheets: 4 × 8 ft at actual thickness (3/4 in plywood = 23/32 in)](https://xemstudio.com/objects/plywood-and-drywall/) - [Sheet metal gauge chart: steel, galvanized, stainless and aluminum (10, 12, 14, 16, 18, 20 gauge in inches and mm)](https://xemstudio.com/objects/sheet-metal-gauge-chart-steel-galvanized-stainless-aluminum/) - [Bar stock sizes: 1018 steel round and square 1/8 to 6 in, 6061 aluminum square 1/4 to 8 in (distributor list, inches and mm)](https://xemstudio.com/objects/bar-stock-sizes-round-square-steel-aluminum/) - [Acrylic tube sizes: OD × ID × wall (1/4 to 6 in OD, clear extruded PMMA), inch and mm](https://xemstudio.com/objects/acrylic-tube-od-wall-sizes/) - [Acetal (Delrin) rod diameters: 1/8 to 2 in and 4 to 250 mm nominal sizes](https://xemstudio.com/objects/acetal-delrin-rod-diameters/) - [Nylon 6/6, HDPE, UHMW and PTFE rod diameters and sheet thicknesses: stock sizes from distributor lists (inch and mm)](https://xemstudio.com/objects/nylon-hdpe-uhmw-ptfe-rod-and-sheet-sizes/)