Complete gauge to mm and inches conversion for steel, galvanized, stainless steel, aluminium, and wire gauge (B&S / SWG). Updated 2026 reference for India.
Select the metal type to view the correct gauge to mm conversion table. Each metal uses a different gauge standard — always confirm the material before using the table.
US Standard Gauge (USG) for mild steel / carbon steel sheet. Higher gauge = thinner sheet.
| Gauge No. | Thickness (Inches) | Thickness (mm) | Weight (kg/m²) |
|---|---|---|---|
| 3 | 0.2391 | 6.073 | 47.67 |
| 4 | 0.2242 | 5.695 | 44.71 |
| 5 | 0.2092 | 5.314 | 41.71 |
| 6 | 0.1943 | 4.935 | 38.74 |
| 7 | 0.1793 | 4.554 | 35.75 |
| 8 | 0.1644 | 4.175 | 32.77 |
| 9 | 0.1495 | 3.797 | 29.81 |
| 10 | 0.1345 | 3.416 | 26.82 |
| 11 | 0.1196 | 3.038 | 23.85 |
| 12 | 0.1046 | 2.657 | 20.86 |
| 13 | 0.0897 | 2.278 | 17.88 |
| 14 | 0.0747 | 1.897 | 14.89 |
| 15 | 0.0673 | 1.709 | 13.42 |
| 16 | 0.0598 | 1.519 | 11.92 |
| 17 | 0.0538 | 1.367 | 10.73 |
| 18 | 0.0478 | 1.214 | 9.53 |
| 19 | 0.0418 | 1.062 | 8.34 |
| 20 | 0.0359 | 0.912 | 7.16 |
| 21 | 0.0329 | 0.836 | 6.56 |
| 22 | 0.0299 | 0.759 | 5.96 |
| 23 | 0.0269 | 0.683 | 5.36 |
| 24 | 0.0239 | 0.607 | 4.76 |
| 25 | 0.0209 | 0.531 | 4.17 |
| 26 | 0.0179 | 0.455 | 3.57 |
| 27 | 0.0164 | 0.417 | 3.27 |
| 28 | 0.0149 | 0.378 | 2.97 |
| 29 | 0.0135 | 0.343 | 2.69 |
| 30 | 0.0120 | 0.305 | 2.39 |
* Highlighted rows (10, 14, 18, 22) are most commonly stocked by Indian steel suppliers. Weight calculated at density 7.85 g/cm³. Standard: US Standard Gauge (USG) / ASTM. For MS sheet weight calculator, visit our MS Sheet Weight Calculator – India.
Galvanized (GI) steel gauge — slightly thicker than plain MS at same gauge due to zinc coating. Reference: IS 277:2018.
| Gauge No. | Thickness (Inches) | Thickness (mm) | Weight (kg/m²) |
|---|---|---|---|
| 8 | 0.1681 | 4.270 | 33.52 |
| 9 | 0.1532 | 3.891 | 30.54 |
| 10 | 0.1382 | 3.510 | 27.55 |
| 11 | 0.1233 | 3.132 | 24.59 |
| 12 | 0.1084 | 2.753 | 21.61 |
| 13 | 0.0934 | 2.372 | 18.62 |
| 14 | 0.0785 | 1.994 | 15.65 |
| 15 | 0.0710 | 1.803 | 14.15 |
| 16 | 0.0635 | 1.613 | 12.66 |
| 17 | 0.0575 | 1.461 | 11.47 |
| 18 | 0.0516 | 1.310 | 10.28 |
| 19 | 0.0456 | 1.158 | 9.09 |
| 20 | 0.0396 | 1.006 | 7.90 |
| 21 | 0.0366 | 0.930 | 7.30 |
| 22 | 0.0336 | 0.853 | 6.70 |
| 23 | 0.0306 | 0.777 | 6.10 |
| 24 | 0.0276 | 0.701 | 5.50 |
| 25 | 0.0247 | 0.627 | 4.92 |
| 26 | 0.0217 | 0.551 | 4.33 |
| 27 | 0.0202 | 0.513 | 4.03 |
| 28 | 0.0187 | 0.475 | 3.73 |
| 29 | 0.0172 | 0.437 | 3.43 |
| 30 | 0.0157 | 0.399 | 3.13 |
* GI gauge is thicker than MS gauge at same number due to zinc coating. Reference: IS 277:2018 (BIS). See full details on our Galvanized Steel Gauge Table page.
Stainless steel uses its own gauge standard. Density is slightly higher (~7.93–7.98 g/cm³ for SS 304/316).
| Gauge No. | Thickness (Inches) | Thickness (mm) | Weight SS 304 (kg/m²) |
|---|---|---|---|
| 7 | 0.1875 | 4.763 | 37.77 |
| 8 | 0.1719 | 4.366 | 34.62 |
| 9 | 0.1563 | 3.969 | 31.47 |
| 10 | 0.1406 | 3.571 | 28.31 |
| 11 | 0.1250 | 3.175 | 25.18 |
| 12 | 0.1094 | 2.779 | 22.04 |
| 13 | 0.0938 | 2.382 | 18.89 |
| 14 | 0.0781 | 1.984 | 15.73 |
| 15 | 0.0703 | 1.786 | 14.16 |
| 16 | 0.0625 | 1.588 | 12.59 |
| 17 | 0.0563 | 1.429 | 11.33 |
| 18 | 0.0500 | 1.270 | 10.07 |
| 19 | 0.0438 | 1.111 | 8.81 |
| 20 | 0.0375 | 0.953 | 7.56 |
| 21 | 0.0344 | 0.874 | 6.93 |
| 22 | 0.0313 | 0.794 | 6.30 |
| 24 | 0.0250 | 0.635 | 5.03 |
| 26 | 0.0188 | 0.478 | 3.79 |
| 28 | 0.0156 | 0.396 | 3.14 |
| 30 | 0.0125 | 0.318 | 2.52 |
* Weight calculated using SS 304 density 7.93 g/cm³. For SS 316, multiply by 7.98/7.93. Highlighted rows are most stocked by Indian SS sheet suppliers (Mumbai, Ahmedabad, Chennai).
Aluminium sheet uses the Brown & Sharp (B&S) gauge system, same as wire. Density = 2.70 g/cm³.
| Gauge No. (B&S) | Thickness (Inches) | Thickness (mm) | Weight Al (kg/m²) |
|---|---|---|---|
| 4 | 0.2043 | 5.189 | 14.01 |
| 5 | 0.1819 | 4.621 | 12.48 |
| 6 | 0.1620 | 4.115 | 11.11 |
| 7 | 0.1443 | 3.665 | 9.90 |
| 8 | 0.1285 | 3.264 | 8.81 |
| 9 | 0.1144 | 2.906 | 7.85 |
| 10 | 0.1019 | 2.588 | 6.99 |
| 11 | 0.0907 | 2.304 | 6.22 |
| 12 | 0.0808 | 2.053 | 5.54 |
| 13 | 0.0720 | 1.829 | 4.94 |
| 14 | 0.0641 | 1.628 | 4.40 |
| 15 | 0.0571 | 1.450 | 3.92 |
| 16 | 0.0508 | 1.290 | 3.48 |
| 17 | 0.0453 | 1.151 | 3.11 |
| 18 | 0.0403 | 1.024 | 2.76 |
| 19 | 0.0359 | 0.912 | 2.46 |
| 20 | 0.0320 | 0.813 | 2.20 |
| 22 | 0.0253 | 0.644 | 1.74 |
| 24 | 0.0201 | 0.511 | 1.38 |
| 26 | 0.0159 | 0.405 | 1.09 |
| 28 | 0.0126 | 0.321 | 0.87 |
| 30 | 0.0100 | 0.255 | 0.69 |
* Aluminium uses B&S gauge. Weight = Thickness (mm) × 2.70 kg/m² per mm. Highlighted rows are most commonly stocked in Indian aluminium sheet markets. External reference: IndiaMart – Aluminium Sheet Suppliers India.
B&S (Brown & Sharp) gauge is used for non-ferrous wire (copper, brass, aluminium). SWG (Standard Wire Gauge / Imperial) is used for steel and copper wire in India/UK.
| Gauge No. | B&S (mm) | B&S (Inches) | SWG (mm) | SWG (Inches) |
|---|---|---|---|---|
| 1 | 7.348 | 0.289 | 7.620 | 0.300 |
| 2 | 6.543 | 0.258 | 7.010 | 0.276 |
| 3 | 5.827 | 0.229 | 6.401 | 0.252 |
| 4 | 5.189 | 0.204 | 5.893 | 0.232 |
| 5 | 4.621 | 0.182 | 5.385 | 0.212 |
| 6 | 4.115 | 0.162 | 4.877 | 0.192 |
| 7 | 3.664 | 0.144 | 4.470 | 0.176 |
| 8 | 3.264 | 0.129 | 4.064 | 0.160 |
| 9 | 2.906 | 0.114 | 3.658 | 0.144 |
| 10 | 2.588 | 0.102 | 3.251 | 0.128 |
| 11 | 2.304 | 0.091 | 2.946 | 0.116 |
| 12 | 2.052 | 0.081 | 2.642 | 0.104 |
| 13 | 1.829 | 0.072 | 2.337 | 0.092 |
| 14 | 1.628 | 0.064 | 2.032 | 0.080 |
| 15 | 1.450 | 0.057 | 1.829 | 0.072 |
| 16 | 1.291 | 0.051 | 1.626 | 0.064 |
| 17 | 1.149 | 0.045 | 1.422 | 0.056 |
| 18 | 1.024 | 0.040 | 1.219 | 0.048 |
| 19 | 0.912 | 0.036 | 1.016 | 0.040 |
| 20 | 0.813 | 0.032 | 0.914 | 0.036 |
| 21 | 0.724 | 0.028 | 0.813 | 0.032 |
| 22 | 0.643 | 0.025 | 0.711 | 0.028 |
| 24 | 0.511 | 0.020 | 0.559 | 0.022 |
| 26 | 0.404 | 0.016 | 0.457 | 0.018 |
| 28 | 0.330 | 0.013 | 0.376 | 0.015 |
| 30 | 0.254 | 0.010 | 0.305 | 0.012 |
| 32 | 0.200 | 0.008 | 0.274 | 0.011 |
| 34 | 0.160 | 0.006 | 0.234 | 0.009 |
| 36 | 0.130 | 0.005 | 0.193 | 0.008 |
| 38 | 0.100 | 0.004 | 0.152 | 0.006 |
* B&S = Brown & Sharp (used for copper, brass, aluminium wire). SWG = Standard Wire Gauge / Imperial (used for steel wire, binding wire in India). Highlighted rows are most common in Indian electrical and construction wire markets.
Follow these steps to correctly convert gauge to mm or inches for your material
Different metals use different gauge systems. Mild steel uses US Standard Gauge, aluminium uses B&S gauge, and wire uses B&S or SWG. Always select the correct tab for your material.
Locate your gauge number in the left column of the table. Remember — higher gauge = thinner material. Gauge 8 is much thicker than Gauge 28 for all metals.
Read the thickness in mm (for Indian and metric use) or inches (for US/imperial specifications or older IS drawings). Both values are in the same row.
The kg/m² column lets you estimate procurement weight directly. Multiply kg/m² by total sheet area to get order weight without a separate calculator.
In India, some local/secondary suppliers use non-standard gauge labelling. Always cross-verify with a digital vernier calliper or micrometer at delivery to confirm the actual thickness.
Once you have the thickness in mm, use our MS Sheet Weight Calculator or the formula below to calculate total material weight for your order.
How to convert gauge to mm, inches, and weight — with worked examples for India
From table: Gauge 18 MS = 1.214 mm
In inches: 1.214 ÷ 25.4 = 0.0478″
Weight: 1.214 × 7.85 = 9.53 kg/m²
Gauge 22 GI = 0.853 mm
Sheet size: 2.44 × 1.22 m = 2.977 m²
Weight: 0.853 × 7.85 × 2.977 = ≈ 19.92 kg/sheet
Gauge 14 Al (B&S) = 1.628 mm
Weight/m²: 1.628 × 2.70 = 4.40 kg/m²
8×4 ft sheet: 4.40 × 2.977 = ≈ 13.10 kg
For any steel sheet, multiply thickness in mm by 7.85 to get kg/m². Example: 2 mm steel = 2 × 7.85 = 15.70 kg/m². This works for MS, GI, and stainless steel (use 7.93 for SS304).
Quick guide to selecting the correct gauge standard for different metals used in India
Key industries and professions that rely on gauge to mm conversion charts daily
Fabricators and site engineers in India use gauge to mm charts daily to verify GI sheet, MS plate, and stainless sheet specifications from supplier datasheets and project drawings.
Electrical panel manufacturers specify sheet thickness in gauge (Gauge 16, 18, 20). Electricians and QC engineers use this chart to verify actual mm thickness of enclosures and trays.
Body panel and chassis fabricators in Indian auto ancillary units work with gauge-specified CR/GI sheets. Converting to mm ensures compatibility with press tool and bending machine settings.
Purchase managers and material buyers use gauge to mm charts when comparing quotes from multiple suppliers who may use different unit references (gauge vs mm vs inches).
Older IS and imported drawings often specify thickness in gauge or inches. Draughtsmen and design engineers convert these to mm for IS-standard fabrication shops across India.
Local sheet metal shops (press, roll-forming, roofing) use gauge charts to set machine clearances, select bending radii, and communicate specifications with customers and raw material suppliers.
Practical advice for engineers, buyers, and fabricators working with sheet metal gauges
The biggest mistake in Indian fabrication shops is using the MS gauge table for stainless or aluminium sheets. A Gauge 18 MS sheet is 1.214 mm, but Gauge 18 stainless is 1.270 mm and Gauge 18 aluminium (B&S) is 1.024 mm — always select the correct material tab.
In the Indian secondary steel market, sheets labelled as "Gauge 18" may actually be 1.0–1.15 mm due to under-rolling. Use a digital micrometer or vernier calliper at goods receipt to verify actual thickness before accepting delivery.
When writing purchase orders or fabrication contracts in India, always specify thickness in mm with tolerance (e.g., 1.214 mm ±0.05 mm) rather than gauge number. This prevents disputes and ensures you receive IS-compliant material.
Weigh a sample sheet and calculate expected weight from the gauge table (kg/m² × sheet area). If actual weight is more than 5% below the theoretical value, the sheet is likely under-gauge. This is a common quality issue in unorganised Indian steel markets.
Many Indian structural and electrical drawings specify wire gauge in SWG (e.g., "8 SWG binding wire"). Use the Wire tab above to convert SWG to mm. Do not confuse SWG with B&S — an 8 SWG wire is 4.064 mm, while 8 B&S wire is 3.264 mm.
Save this page to your phone's home screen for quick site access. Site engineers, quality inspectors, and purchase teams across India keep this gauge to mm chart handy for daily material verification. No app or login required.
More steel gauge and weight tools on SheetGauge India
Common questions about gauge to mm and inches conversion answered for India