Sheet metal
Steel weight calculator
In short
The weight of a steel part is section × length × density: m = kg/m × L, with kg/m = A × ρ and ρ = 7850 kg/m³ for steel. The section comes from geometry (plate A = width × thickness, round bar π D² / 4, tube π e (D − e)) or, for IPE, HEA, HEB, UPN and angles, from a section table.
Calculation
Example calculated with the tool’s default values.
Inputs
- Shape
- Plate / flat bar
- Width
- 200 mm
- Length
- 1000 mm
- Thickness
- 5 mm
- Material
- Carbon steel
- Quantity
- 1
Results
- Mass
- 7.85 kg
Worked example
Every value in this section belongs to the example, calculated with the tool’s default values.
Other results of the example
- Mass of one piece
- 7.85 kg
- Linear mass
- 7.850 kg/m
- Cross-section
- 10.00in cm²
- Area of one face
- 0.2000in m²
- Mass per area
- 39.25 kg/m²
Step-by-step calculation
Cross-section
A = l × e
200.0 × 5.0 = 1000.0 mm²
Linear mass
kg/m = A × ρ
0.001000 m² × 7850 kg/m³ = 7.850 kg/m
Piece mass
m = kg/m × L
7.850 × 1.000 m = 7.85 kg
How to use it
- Pick the shape: plate or flat bar, round bar, round tube, square or rectangular tube, IPE, HEA, HEB, UPN or angle.
- Enter the section dimensions, or pick the section size.
- Enter the length, pick the material and set the quantity.
- Read the mass.
Frequently asked questions
How do I calculate plate weight in kg?
m = length × width × thickness × ρ, with ρ = 7850 kg/m³ for steel. Example: 200 × 5 mm flat over 1000 mm: section 200.0 × 5.0 = 1000.0 mm², so 0.001000 m² × 7850 kg/m³ = 7.850 kg/m, and 7.85 kg for the piece. One square metre of 5 mm plate weighs 39.25 kg.
What is the weight of an IPE, HEA or UPN beam?
The calculation takes the linear mass from a section table (EN 10365 for IPE, HEA and HEB; DIN 1026-1 for UPN), in steel at 7850 kg/m³. Examples: IPE 200 = 22.4 kg/m, HEA 200 = 42.3 kg/m, HEB 200 = 61.3 kg/m, UPN 160 = 18.8 kg/m. For another material, kg/m = steel kg/m × ρ / 7850.
How do I calculate the weight of a square tube?
The section is A = 2e (b + h − 2e) − (4 − π)(ro² − ri²), with the nominal corner radii: cold formed (EN 10219-2), ro = 2e up to 6 mm, 2.5e up to 10 mm, 3e above, ri = ro − e; hot finished (EN 10210-2), ro = 1.5e and ri = e. Cross-check: SHS 100×100×5 = 14.70 kg/m hot finished, 14.41 kg/m cold formed.
How do I calculate the weight of a round bar?
For a round bar, the section is A = π D² / 4; for a round tube, A = π e (D − e); then kg/m = A × ρ and m = kg/m × L. Angles come from the EN 10056-1 table: for example L 50x50x5 = 3.77 kg/m and L 100x65x8 = 9.94 kg/m.
Does it work for stainless and aluminium?
Yes, with the density of the chosen material: 7900 kg/m³ for 304L stainless, 8000 kg/m³ for 316L, 7800 kg/m³ for 2205 duplex, 2700 kg/m³ for aluminium and 8940 kg/m³ for copper, against 7850 kg/m³ for steel.
Limits
Indicative results: nominal masses. For sections, the EN 10034 / EN 10056-2 mass tolerance is about ±4 %; for tubes, the wall tolerance can change the mass by a few %. Square tube corner radii are the nominal values of the standard: the manufacturer's catalogue prevails.
Sources
- Masse = volume × masse volumique : Géométrie ; ρ acier 7 850 kg/m³ : EN 10365, voir data/materials.ts