Steel Plate Weight Calculator
Enter a plate's length, width and thickness in millimetres, choose the material, and get the weight per plate plus total weight for multiple plates.
mm
mm
mm
Material
Single-plate weight at the chosen density
39.25 kg
- 1
Plate area
(1,000 ÷ 1000) × (500 ÷ 1000) = 0.5 m²Dimensions in mm are divided by 1000 to convert to metres. - 2
Volume
0.5 m² × (10 ÷ 1000) = 0.005 m³ - 3
Weight per plate
0.005 m³ × 7,850 kg/m³ = 39.250
How does this calculator work?
Weight = L × W × T (in mm) × density ÷ 10⁹. For mild steel (7,850 kg/m³) a 1,000 × 500 × 10 mm plate weighs 39.25 kg. Enter dimensions and quantity to get single-plate and total weight in kilograms for steel, stainless or aluminium.
Formula
How this is calculated
The weight of any rectangular plate equals its volume multiplied by the material density. Volume in m³ is found by converting each dimension from millimetres to metres (divide by 1,000) and multiplying the three together: L/1000 × W/1000 × T/1000. Multiplying by density (kg/m³) gives the mass in kilograms.
Steel density depends on alloy composition. Mild structural steel (A36, S235, S355) is approximately 7,850 kg/m³ — the standard reference used in fabrication and structural engineering. Austenitic stainless steels 304 and 316 are slightly denser (8,000–8,030 kg/m³) due to nickel and molybdenum content; aluminium 6061 at 2,700 kg/m³ is roughly one-third the weight of steel for equal geometry. These are industry reference densities (2024); certified plate weight from the mill test report (MTR) will reflect the specific batch.
The weight per m² (kg/m²) is useful for structural loading and shipping area estimates — it equals density × thickness in metres. Multiply the single-plate result by the quantity field to get total procurement or lifting weight.
Frequently asked questions
Mild structural steel (ASTM A36, EN S235, S355) uses 7,850 kg/m³ — the accepted engineering reference. Real plate density from a mill test report may vary by ±0.5–1% depending on the exact alloy batch.
Divide kilograms by 1,000 to get metric tonnes. Multiply by 2.20462 to get pounds. For example, a 39.25 kg plate equals 0.039 t or 86.6 lb.
Yes — select the material in the dropdown. The formula is identical; only the density changes (2,700 kg/m³ for aluminium 6061, 8,000 kg/m³ for stainless 304, 8,030 kg/m³ for stainless 316).
Also known as
TG we-Calculate Editorial Team. (2026). Steel Plate Weight Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/steel-plate-weight-calculator
TG we-Calculate Editorial Team. "Steel Plate Weight Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/steel-plate-weight-calculator.
TG we-Calculate Editorial Team, "Steel Plate Weight Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/steel-plate-weight-calculator
@misc{wecalculate_steel_plate_weight_calculator, title = {Steel Plate Weight Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/steel-plate-weight-calculator}}, year = {2026}, note = {TG we-Calculate} }
Did this calculator help you?