How to use Steel Plate Weight Calculator
- Choose the material grade, or enter a custom density.
- Pick the shape and enter dimensions. Pipe can use size and schedule, sheet can use gauges, rebar uses bar sizes and beams can come from the standard section library.
- Enter length and quantity, optionally a unit price; results update as you type. Add several items to the list to total an order.
Steel plate weight chart by thickness
Steel plate weight per square metre = thickness (mm) × 7.85 kg. Imperial plates are listed as 4 × 8 ft and 4 × 10 ft sheets; 1.5 × 6 m is a common metric mill size.
| Thickness mm | Carbon steel kg/m² | Stainless 304 kg/m² | Aluminum 6061 kg/m² | Steel 1.5×6 m sheet kg |
|---|---|---|---|---|
| 0.5 | 3.92 | 3.96 | 1.35 | 35.3 |
| 0.8 | 6.28 | 6.34 | 2.16 | 56.5 |
| 1 | 7.85 | 7.93 | 2.7 | 70.6 |
| 1.2 | 9.42 | 9.52 | 3.24 | 84.8 |
| 1.5 | 11.77 | 11.89 | 4.05 | 106 |
| 2 | 15.7 | 15.86 | 5.4 | 141.3 |
| 2.5 | 19.62 | 19.82 | 6.75 | 176.6 |
| 3 | 23.55 | 23.79 | 8.1 | 211.9 |
| 4 | 31.4 | 31.72 | 10.8 | 282.6 |
| 5 | 39.25 | 39.65 | 13.5 | 353.2 |
| 6 | 47.1 | 47.58 | 16.2 | 423.9 |
| 8 | 62.8 | 63.44 | 21.6 | 565.2 |
| 10 | 78.5 | 79.3 | 27 | 706.5 |
| 12 | 94.2 | 95.16 | 32.4 | 847.8 |
| 14 | 109.9 | 111.02 | 37.8 | 989.1 |
| 16 | 125.6 | 126.88 | 43.2 | 1,130.4 |
| 18 | 141.3 | 142.74 | 48.6 | 1,271.7 |
| 20 | 157 | 158.6 | 54 | 1,413 |
| 22 | 172.7 | 174.46 | 59.4 | 1,554.3 |
| 25 | 196.25 | 198.25 | 67.5 | 1,766.2 |
| 28 | 219.8 | 222.04 | 75.6 | 1,978.2 |
| 30 | 235.5 | 237.9 | 81 | 2,119.5 |
| 35 | 274.75 | 277.55 | 94.5 | 2,472.8 |
| 40 | 314 | 317.2 | 108 | 2,826 |
| 45 | 353.25 | 356.85 | 121.5 | 3,179.2 |
| 50 | 392.5 | 396.5 | 135 | 3,532.5 |
| 60 | 471 | 475.8 | 162 | 4,239 |
| 70 | 549.5 | 555.1 | 189 | 4,945.5 |
| 80 | 628 | 634.4 | 216 | 5,652 |
| 90 | 706.5 | 713.7 | 243 | 6,358.5 |
| 100 | 785 | 793 | 270 | 7,065 |
| Thickness | mm | lb/ft² | 4×8 ft sheet lb | 4×10 ft sheet lb |
|---|---|---|---|---|
| 1/8" | 3.17 | 5.1 | 163 | 204 |
| 3/16" | 4.76 | 7.66 | 245 | 306 |
| 1/4" | 6.35 | 10.21 | 327 | 408 |
| 5/16" | 7.94 | 12.76 | 408 | 510 |
| 3/8" | 9.52 | 15.31 | 490 | 613 |
| 1/2" | 12.7 | 20.42 | 653 | 817 |
| 5/8" | 15.88 | 25.52 | 817 | 1,021 |
| 3/4" | 19.05 | 30.63 | 980 | 1,225 |
| 7/8" | 22.22 | 35.73 | 1,143 | 1,429 |
| 1" | 25.4 | 40.84 | 1,307 | 1,634 |
| 1-1/4" | 31.75 | 51.05 | 1,634 | 2,042 |
| 1-1/2" | 38.1 | 61.26 | 1,960 | 2,450 |
| 2" | 50.8 | 81.68 | 2,614 | 3,267 |
| 3" | 76.2 | 122.51 | 3,920 | 4,901 |
| 4" | 101.6 | 163.35 | 5,227 | 6,534 |
Frequently asked questions
How can I estimate plate weight quickly?
Carbon steel plate weighs about thickness (mm) × 7.85 kg per m², so 10 mm plate is 78.5 kg/m²; in imperial units each inch of thickness is about 40.8 lb/ft². Multiply by the area for the sheet weight.
Does it work for checker or galvanized plate?
Flat plate is calculated from length, width and thickness. Checker plate adds the pattern weight to the base thickness, and galvanizing adds roughly 0.1–0.3 kg/m² per side; add these from your supplier data.
What is the formula for metal weight?
Weight = cross-sectional area × length × density. With millimetres and g/cm³, weight per metre in kg/m = area (mm²) × density ÷ 1000. A Ø20 mm steel bar has 314.16 mm², so 314.16 × 7.85 ÷ 1000 = 2.466 kg/m.
Why does theoretical weight differ from scale weight?
Theoretical weight uses nominal dimensions. Delivered material has thickness or wall tolerances, rolled radii, galvanizing and coatings, typically ±2–5%. State in the contract whether you settle by theoretical or actual weight.
Can I use inches and pounds?
Yes. Switch to inches for dimensions; results always show kg, lb, kg/m and lb/ft. Length can be m, mm, ft or in, and price can be per kg, lb, tonne, metre, foot or piece.
Can I total several items?
Use “Add to list” to collect different materials, shapes and quantities. The list totals weight and cost and can be copied or exported as CSV for quotations and container planning. It is stored only in this browser.
Theoretical weights use nominal dimensions and densities for quoting, shipping and cutting estimates. Settlement weight follows the contract, mill certificate or actual weighing.