# Woven wire mesh sizes: mesh count, wire diameter, opening and open area — 2 to 325 mesh (square weave, market and mill grade)

> What is the wire diameter, opening size and open area of 4, 8, 10, 20, 40 and 100 mesh woven wire cloth?

- Category: Hardware › Materials & stock
- Kind: Standard part
- Basis: Woven Wire Products' market-grade table (39 rows, 2 to 325 mesh), its stainless 14 to 20 mesh sheets and Newark Wire Cloth's mill-grade table (29 rows, 2 to 60 mesh), with the open area recomputed; numbers only
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**Exact dimensions.** True size, with no tolerance added.

## Notes

- Mesh count is the number of openings per linear inch, counted from the centre of one wire to the same point 1 inch away. For square plain weave with wire diameter d (in) and count m, the opening is 1/m − d and the open area is (1 − m × d)² (as a fraction). The last two columns apply those two formulas to the printed mesh and wire diameter; they are computed here as a check and match the printed opening and open area to rounding in every row.
- A mesh count does not fix the wire: the same count is made with several wire diameters, which changes the opening and open area. Woven Wire Products lists 4 mesh with 0.047 in wire (0.203 in opening, 65.9% open) and with 0.063 in wire (0.187 in, 56.0%); Newark's mill-grade 4 × 4 uses 0.035 in wire (0.215 in, 74.0%). The two makers' tables are different grades (market grade against mill grade) and differ at nearly every count; state the wire diameter, not just the mesh, when you order.
- Mesh sizes are normally ordered as 'mesh × mesh × wire diameter' (for example 10 × 10 × 0.025). The Woven Wire Products stainless rows (14 to 20 mesh, 0.009 in wire) are the fine-wire, high-open-area version and carry T-304 and T-316 data sheets on the maker's site (not read). Wire diameters in mm are converted × 25.4 (computed) where the maker does not print them. Other weaves (twill, Dutch), rectangular mesh, space cloth and welded wire mesh are not covered here.
- Sieves and screens: US sieve numbers and mesh counts are close but not identical series; this page lists wire cloth only. Not to be confused with expanded metal (expanded-metal-standard-designations-swd-lwd), perforated sheet (perforated-metal-round-hole-standard-patterns) or the regenerator screens on this site. Gauge for wire diameters: awg-wire-gauge-table-astm-b258 and swg-standard-wire-gauge-table. No file: woven cloth is wire crossing over and under wire, and the crimp is not published as numbers.

## Sizes

| source | mesh count | wire dia (in) | wire dia (mm) | opening (in) | opening (mm) | open area % (printed) | open area % = 100 × (1 − m d)² (computed) | opening in = 1/m − d (computed) |
|---|---|---|---|---|---|---|---|---|
| Woven Wire Products, market grade | 2 mesh | 0.063 | 1.600 | 0.437 | 11.100 | 76.4 | 76.4 | 0.4370 |
| Woven Wire Products, market grade | 3 mesh | 0.054 | 1.372 | 0.279 | 7.087 | 70.1 | 70.2 | 0.2793 |
| Woven Wire Products, market grade | 4 mesh | 0.047 | 1.194 | 0.203 | 5.156 | 65.9 | 65.9 | 0.2030 |
| Woven Wire Products, market grade | 4 mesh | 0.063 | 1.600 | 0.187 | 4.750 | 56.0 | 56.0 | 0.1870 |
| Woven Wire Products, market grade | 5 mesh | 0.041 | 1.041 | 0.159 | 4.039 | 63.2 | 63.2 | 0.1590 |
| Woven Wire Products, market grade | 5 mesh | 0.047 | 1.194 | 0.153 | 3.886 | 58.5 | 58.5 | 0.1530 |
| Woven Wire Products, market grade | 6 mesh | 0.035 | 0.889 | 0.132 | 3.353 | 62.7 | 62.4 | 0.1317 |
| Woven Wire Products, market grade | 7 mesh | 0.035 | 0.889 | 0.108 | 2.743 | 57.0 | 57.0 | 0.1079 |
| Woven Wire Products, market grade | 8 mesh | 0.028 | 0.711 | 0.097 | 2.464 | 60.2 | 60.2 | 0.0970 |
| Woven Wire Products, market grade | 8 mesh | 0.032 | 0.813 | 0.093 | 2.362 | 55.4 | 55.4 | 0.0930 |
| Woven Wire Products, market grade | 9 mesh | 0.032 | 0.813 | 0.079 | 2.007 | 50.7 | 50.7 | 0.0791 |
| Woven Wire Products, market grade | 10 mesh | 0.025 | 0.635 | 0.075 | 1.905 | 56.3 | 56.2 | 0.0750 |
| Woven Wire Products, market grade | 12 mesh | 0.023 | 0.584 | 0.06 | 1.524 | 52.4 | 52.4 | 0.0603 |
| Woven Wire Products, market grade | 14 mesh | 0.02 | 0.508 | 0.051 | 1.295 | 51.0 | 51.8 | 0.0514 |
| Woven Wire Products, market grade | 16 mesh | 0.018 | 0.457 | 0.0445 | 1.130 | 50.7 | 50.7 | 0.0445 |
| Woven Wire Products, market grade | 16 mesh | 0.023 | 0.584 | 0.0395 | 1.003 | 39.9 | 39.9 | 0.0395 |
| Woven Wire Products, market grade | 18 mesh | 0.017 | 0.432 | 0.0386 | 0.980 | 48.3 | 48.2 | 0.0386 |
| Woven Wire Products, market grade | 20 mesh | 0.016 | 0.406 | 0.034 | 0.864 | 46.2 | 46.2 | 0.0340 |
| Woven Wire Products, market grade | 22 mesh | 0.015 | 0.381 | 0.0305 | 0.775 | 45.0 | 44.9 | 0.0305 |
| Woven Wire Products, market grade | 24 mesh | 0.014 | 0.356 | 0.0277 | 0.704 | 44.2 | 44.1 | 0.0277 |
| Woven Wire Products, market grade | 30 mesh | 0.012 | 0.305 | 0.0213 | 0.541 | 41.0 | 41.0 | 0.0213 |
| Woven Wire Products, market grade | 30 mesh | 0.0125 | 0.318 | 0.0208 | 0.528 | 39.1 | 39.1 | 0.0208 |
| Woven Wire Products, market grade | 35 mesh | 0.011 | 0.279 | 0.0176 | 0.447 | 37.8 | 37.8 | 0.0176 |
| Woven Wire Products, market grade | 40 mesh | 0.01 | 0.254 | 0.015 | 0.381 | 36.0 | 36.0 | 0.0150 |
| Woven Wire Products, market grade | 40 mesh | 0.0095 | 0.241 | 0.0155 | 0.394 | 38.4 | 38.4 | 0.0155 |
| Woven Wire Products, market grade | 45 mesh | 0.008 | 0.203 | 0.0142 | 0.361 | 41.0 | 41.0 | 0.0142 |
| Woven Wire Products, market grade | 45 mesh | 0.0095 | 0.241 | 0.0127 | 0.323 | 32.7 | 32.8 | 0.0127 |
| Woven Wire Products, market grade | 50 mesh | 0.009 | 0.229 | 0.011 | 0.279 | 30.3 | 30.3 | 0.0110 |
| Woven Wire Products, market grade | 60 mesh | 0.0075 | 0.190 | 0.0092 | 0.234 | 30.3 | 30.3 | 0.0092 |
| Woven Wire Products, market grade | 70 mesh | 0.0065 | 0.165 | 0.0078 | 0.198 | 29.7 | 29.7 | 0.0078 |
| Woven Wire Products, market grade | 70 mesh | 0.007 | 0.178 | 0.0073 | 0.185 | 26.1 | 26.0 | 0.0073 |
| Woven Wire Products, market grade | 80 mesh | 0.0055 | 0.140 | 0.007 | 0.178 | 31.4 | 31.4 | 0.0070 |
| Woven Wire Products, market grade | 90 mesh | 0.005 | 0.127 | 0.0061 | 0.155 | 30.1 | 30.3 | 0.0061 |
| Woven Wire Products, market grade | 100 mesh | 0.0045 | 0.114 | 0.0055 | 0.140 | 30.3 | 30.3 | 0.0055 |
| Woven Wire Products, market grade | 110 mesh | 0.004 | 0.102 | 0.0051 | 0.130 | 31.4 | 31.4 | 0.0051 |
| Woven Wire Products, market grade | 120 mesh | 0.0037 | 0.094 | 0.0046 | 0.117 | 30.9 | 30.9 | 0.0046 |
| Woven Wire Products, market grade | 150 mesh | 0.0026 | 0.066 | 0.0041 | 0.104 | 37.4 | 37.2 | 0.0041 |
| Woven Wire Products, market grade | 200 mesh | 0.0021 | 0.053 | 0.0029 | 0.074 | 33.6 | 33.6 | 0.0029 |
| Woven Wire Products, market grade | 325 mesh | 0.0014 | 0.036 | 0.0017 | 0.043 | 30.0 | 29.7 | 0.0017 |
| Woven Wire Products, stainless (T-304 / T-316 sheets) | 14 mesh | 0.009 | 0.229 | 0.0624 | 1.58 | 76.4 | 76.4 | 0.0624 |
| Woven Wire Products, stainless (T-304 / T-316 sheets) | 16 mesh | 0.009 | 0.229 | 0.0535 | 1.359 | 73.3 | 73.3 | 0.0535 |
| Woven Wire Products, stainless (T-304 / T-316 sheets) | 18 mesh | 0.009 | 0.229 | 0.0466 | 1.184 | 70.2 | 70.2 | 0.0466 |
| Woven Wire Products, stainless (T-304 / T-316 sheets) | 20 mesh | 0.009 | 0.229 | 0.041 | 1.041 | 67.2 | 67.2 | 0.0410 |
| Newark Wire Cloth, mill grade | 2 × 2 | 0.054 | 1.37 | 0.446 | 11.33 | 79.6 | 79.6 | 0.4460 |
| Newark Wire Cloth, mill grade | 3 × 3 | 0.041 | 1.04 | 0.292 | 7.43 | 76.9 | 76.9 | 0.2923 |
| Newark Wire Cloth, mill grade | 4 × 4 | 0.035 | 0.89 | 0.215 | 5.46 | 74.0 | 74.0 | 0.2150 |
| Newark Wire Cloth, mill grade | 5 × 5 | 0.032 | 0.81 | 0.168 | 4.27 | 70.6 | 70.6 | 0.1680 |
| Newark Wire Cloth, mill grade | 6 × 6 | 0.028 | 0.71 | 0.139 | 3.52 | 69.2 | 69.2 | 0.1387 |
| Newark Wire Cloth, mill grade | 7 × 7 | 0.028 | 0.71 | 0.115 | 2.92 | 64.6 | 64.6 | 0.1149 |
| Newark Wire Cloth, mill grade | 8 × 8 | 0.025 | 0.64 | 0.1 | 2.54 | 64.0 | 64.0 | 0.1000 |
| Newark Wire Cloth, mill grade | 9 × 9 | 0.023 | 0.58 | 0.088 | 2.24 | 62.9 | 62.9 | 0.0881 |
| Newark Wire Cloth, mill grade | 10 × 10 | 0.02 | 0.51 | 0.08 | 2.03 | 64.0 | 64.0 | 0.0800 |
| Newark Wire Cloth, mill grade | 11 × 11 | 0.02 | 0.51 | 0.071 | 1.8 | 60.8 | 60.8 | 0.0709 |
| Newark Wire Cloth, mill grade | 12 × 12 | 0.018 | 0.46 | 0.065 | 1.66 | 61.5 | 61.5 | 0.0653 |
| Newark Wire Cloth, mill grade | 14 × 14 | 0.017 | 0.43 | 0.054 | 1.38 | 58.1 | 58.1 | 0.0544 |
| Newark Wire Cloth, mill grade | 16 × 16 | 0.016 | 0.41 | 0.047 | 1.18 | 55.4 | 55.4 | 0.0465 |
| Newark Wire Cloth, mill grade | 18 × 18 | 0.015 | 0.38 | 0.041 | 1.03 | 53.3 | 53.3 | 0.0406 |
| Newark Wire Cloth, mill grade | 20 × 20 | 0.014 | 0.36 | 0.036 | 0.91 | 51.8 | 51.8 | 0.0360 |
| Newark Wire Cloth, mill grade | 22 × 22 | 0.0135 | 0.34 | 0.032 | 0.81 | 49.4 | 49.4 | 0.0320 |
| Newark Wire Cloth, mill grade | 24 × 24 | 0.013 | 0.33 | 0.029 | 0.73 | 47.3 | 47.3 | 0.0287 |
| Newark Wire Cloth, mill grade | 26 × 26 | 0.011 | 0.28 | 0.027 | 0.7 | 51.0 | 51.0 | 0.0275 |
| Newark Wire Cloth, mill grade | 28 × 28 | 0.01 | 0.25 | 0.026 | 0.65 | 51.8 | 51.8 | 0.0257 |
| Newark Wire Cloth, mill grade | 30 × 30 | 0.0095 | 0.24 | 0.024 | 0.61 | 51.1 | 51.1 | 0.0238 |
| Newark Wire Cloth, mill grade | 32 × 32 | 0.009 | 0.23 | 0.022 | 0.57 | 50.7 | 50.7 | 0.0222 |
| Newark Wire Cloth, mill grade | 34 × 34 | 0.009 | 0.23 | 0.02 | 0.52 | 48.2 | 48.2 | 0.0204 |
| Newark Wire Cloth, mill grade | 36 × 36 | 0.009 | 0.23 | 0.019 | 0.48 | 45.7 | 45.7 | 0.0188 |
| Newark Wire Cloth, mill grade | 38 × 38 | 0.0085 | 0.22 | 0.018 | 0.45 | 45.8 | 45.8 | 0.0178 |
| Newark Wire Cloth, mill grade | 40 × 40 | 0.0085 | 0.22 | 0.017 | 0.42 | 43.6 | 43.6 | 0.0165 |
| Newark Wire Cloth, mill grade | 45 × 45 | 0.008 | 0.2 | 0.014 | 0.36 | 41.0 | 41.0 | 0.0142 |
| Newark Wire Cloth, mill grade | 50 × 50 | 0.0075 | 0.19 | 0.013 | 0.32 | 39.1 | 39.1 | 0.0125 |
| Newark Wire Cloth, mill grade | 55 × 55 | 0.007 | 0.18 | 0.011 | 0.28 | 37.8 | 37.8 | 0.0112 |
| Newark Wire Cloth, mill grade | 60 × 60 | 0.0065 | 0.17 | 0.01 | 0.26 | 37.2 | 37.2 | 0.0102 |

## Where the files are

- Woven Wire Products: [Market grade wire mesh: mesh count, wire diameter, opening, open area %, 2 to 325 mesh](https://www.wovenwire.com/market-grade-wire-mesh.htm) — web — Maker page; numbers only
- Woven Wire Products: [Product specifications: stainless 14, 16, 18, 20 mesh with 0.009 in wire (opening in inch and mm, wire in inch and mm, open area)](https://www.wovenwire.com/reference/product-specifications.htm) — web — Maker page; numbers only
- Newark Wire Cloth: [Mill grade wire cloth: 2 × 2 to 60 × 60 mesh, wire diameter, opening and open area in inch and mm](https://newarkwire.com/wp-content/uploads/MILL-GRADE-WIRE-CLOTH.pdf) — web — Maker sheet; numbers only

## Questions

**What is the opening of 10 mesh wire cloth?**

0.075 in with 0.025 in wire (Woven Wire Products, 56.3% open) or 0.080 in with 0.020 in wire (Newark mill grade, 64.0% open): the opening is 1/10 − the wire diameter.

**How do I calculate open area of wire mesh?**

(1 − mesh count × wire diameter in inches)² × 100. For 20 mesh with 0.016 in wire that is (1 − 0.32)² = 46.2%, which is what Woven Wire Products prints.

**What does mesh count mean?**

Openings per linear inch, measured from wire centre to the same point one inch along. 100 mesh has 100 openings to the inch.

**Does the same mesh always have the same opening?**

No. 4 mesh is 0.203 in open with 0.047 in wire and 0.187 in with 0.063 in wire (Woven Wire Products); the opening depends on the wire.

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