Steel Weight Calculator
Calculate the weight of sheets, plates, bars and tubes in steel, stainless or aluminum. Metric and imperial units.
Inputs
Density 7,850 kg/m³
Result
Total weight
47.1kg
103.84 lb
- Weight per piece
- 47.1kg103.84 lb
- Density
- 7,850kg/m³
Formula
Weight = Length × Width × Thickness × Density
Results are estimates and should be verified for critical engineering or manufacturing applications.
How it works
The weight of any metal part is its volume multiplied by the density of the material. The calculator works out the cross-section area of the shape you pick, multiplies it by the length to get the volume, and then by the density of the selected material.
- Choose a material and a shape: sheet or plate, round, square or flat bar, rectangular tube or round tube.
- Enter the dimensions. Each field has its own unit, so you can mix millimeters for thickness with meters or feet for length.
- The result updates as you type, in kilograms and pounds, per piece and for the whole quantity.
Densities used: mild steel and Corten 7,850 kg/m³, stainless steel 304 and 316 8,000 kg/m³, aluminum 2,700 kg/m³. Tubes are calculated with sharp corners, so rectangular hollow sections with large corner radii weigh slightly less in reality.
Formula
- Weight = Volume × Density
- Sheet / plate: Volume = Length × Width × Thickness
- Round bar: Volume = π × (D ÷ 2)² × Length
- Round tube: Volume = π ÷ 4 × (OD² − (OD − 2t)²) × Length
- Rectangular tube: Volume = (W × H − (W − 2t) × (H − 2t)) × Length
- D / OD
- Diameter / outer diameter
- t
- Wall thickness
- W, H
- Tube width and height
All dimensions are converted to meters first, so the volume is in m³ and the weight in kg.
Example
A 2,000 × 1,000 × 3 mm mild steel sheet
- 1Volume = 2 m × 1 m × 0.003 m = 0.006 m³
- 2Weight = 0.006 m³ × 7,850 kg/m³ = 47.1 kg
- 3In pounds: 47.1 kg × 2.2046 = 103.84 lb
One sheet weighs 47.1 kg (103.84 lb).
Frequently asked questions
What density does the calculator use for steel?
Mild steel and Corten use 7,850 kg/m³, the standard value for carbon steel. Stainless steel 304 and 316 use 8,000 kg/m³ and aluminum uses 2,700 kg/m³. Specific alloys can vary by a percent or two.
How do I calculate the weight of a steel plate by hand?
Multiply length × width × thickness in meters to get the volume in cubic meters, then multiply by 7,850. For example, a 1 m × 1 m × 10 mm plate is 0.01 m³ × 7,850 = 78.5 kg.
Can I use inches and feet?
Yes. Switch to Imperial or pick a unit per field: mm, cm, m, inches or feet. Results are always shown in both kilograms and pounds.
Why does my supplier's weight differ slightly?
Suppliers use nominal tables that account for rolling tolerances, corner radii on tubes and exact alloy density. Expect small differences, typically a few percent.
Is my data sent anywhere?
No. The calculation runs entirely in your browser.