Steel Weight
Calculator
Online weight calculator for round bar, pipe, plate, hex, square and flat bar profiles. Supports carbon steel, stainless steel, and aluminum.
Weight Calculation Formulas
Round Bar
d: Diameter (mm), L: Length (m)
Hexagon Bar
d: Across Flats (mm), L: Length (m)
Square Bar
a: Side (mm), L: Length (m)
Flat Bar
a: Width, b: Thickness (mm)
Pipe / Tube
D: OD, t: Wall Thickness (mm)
Sheet / Plate
a: Width, b: Length, t: Thickness (mm)
* All formulas are derived from carbon steel density (7.85 g/cm³). For other materials, multiply by the density ratio. Calculated values are theoretical; actual weights may vary 3-5% due to manufacturing tolerances.
Need This Product?
Get a quick quote for the product you calculated. Our expert team will get back to you as soon as possible.
Get a QuoteFrequently Asked Questions
What is the steel weight calculation formula?
The steel weight formula varies by profile type. Round bar: d² x 0.006165 x L (kg), Pipe: (D-t) x t x 0.02466 x L (kg), Plate: a x b x t x 0.00000785 (kg). All formulas are derived from carbon steel density (7.85 g/cm³).
How is pipe weight calculated?
Pipe weight formula: (Outer Diameter - Wall Thickness) x Wall Thickness x 0.02466 x Length. All dimensions in mm, length in meters. Result is in kg.
Is stainless steel heavier than carbon steel?
Yes, stainless steel is slightly heavier. Carbon steel: 7.85 g/cm³, AISI 304: 7.93 g/cm³, AISI 316: 7.98 g/cm³. Selecting the correct density value is important.
How is steel plate weight calculated?
Steel plate weight: Width(mm) x Length(mm) x Thickness(mm) x 0.00000785. Example: 1000x2000x10mm plate: 1000 x 2000 x 10 x 0.00000785 = 157 kg.
How accurate is this calculator?
Our calculator provides theoretical weight values. Actual weight may vary by 3-5% depending on manufacturing tolerances and surface conditions. Weighing is recommended for exact values.
How to calculate the weight of a steel part?
The total weight of a steel part = volume × density (7,850 kg/m³); for profiles the practical way is to multiply the unit weight (kg/m) by the length. Round bar: 0.00617 × D² × L (kg); pipe: (D − t) × t × 0.02466 × L; sheet/plate: width × length × thickness × 0.00785. D = diameter, t = wall thickness (mm), L = length (m). For total order weight, multiply the part weight by the quantity.
Weight and order calculation by profile type
Weight calculation is needed for shipping, cost and handling planning. The logic is always the same: find the volume, multiply by steel density (7,850 kg/m³). For profiles, instead of computing volume each time, use the shortcut unit weight (kg/m) × length. Practical formulas (dimensions mm, length m, result kg): • Round: 0.00617 × D² × L • Square: 0.00785 × a² × L • Flat: 0.00785 × width × thickness × L • Pipe: 0.02466 × t × (D − t) × L • Sheet/plate: width × length × thickness × 0.00785 (m² × mm) Order total = part weight × quantity. Material density affects the result directly: stainless steel (304: 7.93 · 316: 7.98 g/cm³) is slightly heavier than carbon steel (7.85); for precise work use the density of the specific grade.
Common Steel Profile Unit Weights (Carbon Steel, 7.85 g/cm³)
| Profile | Dimension (mm) | Weight (kg/m) | Weight per 6m bar (kg) |
|---|---|---|---|
| Round bar | Ø10 | 0.617 | 3.70 |
| Round bar | Ø20 | 2.47 | 14.8 |
| Round bar | Ø30 | 5.55 | 33.3 |
| Round bar | Ø50 | 15.4 | 92.5 |
| Round bar | Ø80 | 39.5 | 237 |
| Square bar | 20×20 | 3.14 | 18.8 |
| Square bar | 40×40 | 12.6 | 75.4 |
| Flat bar | 40×10 | 3.14 | 18.8 |
| Flat bar | 60×20 | 9.42 | 56.5 |
| Pipe | Ø60.3×3.91 (2") | 5.44 | 32.6 |
| Pipe | Ø114.3×6.02 (4") | 16.1 | 96.5 |
| Plate (1×2m) | t=5 mm | 78.5 kg/sheet | — |
| Plate (1×2m) | t=10 mm | 157 kg/sheet | — |
Based on carbon steel density 7.85 g/cm³. Stainless steel values are ~1–2% higher.
Frequently Asked Questions
What is the steel weight calculation formula?+
Total weight = volume × density (7,850 kg/m³). Practical forms: round 0.00617 × D² × L, pipe (D − t) × t × 0.02466 × L, sheet width × length × thickness × 0.00785 (D, t in mm; L in m; result kg).
How is pipe weight calculated?+
Pipe weight = (Outside diameter − Wall thickness) × Wall thickness × 0.02466 × Length. Dimensions in mm, length in m, result kg. The formula is for carbon steel (7.85 g/cm³).
How is sheet/plate weight found?+
Sheet weight = width(m) × length(m) × thickness(mm) × 7.85 kg. For example a 1×2 m, 10 mm plate: 1 × 2 × 10 × 7.85 = 157 kg.
Is stainless steel weight different from carbon steel?+
Yes, slightly heavier. Carbon steel is 7.85 g/cm³, AISI 304 is 7.93, and AISI 316 is 7.98 g/cm³. For an accurate calculation, use the density of the specific material.
How is hexagonal steel unit weight calculated?+
Hexagon (across flats S) formula: 0.00680 × S² (mm) = kg/m. E.g. S=30 mm: 0.00680 × 900 = 6.12 kg/m.
Related Products
Other Tools
Related Blog Posts
Technical articles, guides and industry analyses
S235 vs S355 Steel: Which Structural Steel to Choose?
We compare S235JR and S355J2 structural steels by yield strength, chemical composition, weldability and cost — which grade should you choose and when?
Leaded vs Lead-Free Free-Cutting Steel: Which Is the Right Choice?
Comparison of leaded and lead-free free-cutting steels. Differences between 11SMnPb30 and 11SMn30 in terms of machinability, cost, and environmental regulations.