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Material Engineering2D

Steel Weight Calculator

Calculate the weight of steel plates, round bars, pipes, beams and structural sections from dimensions and material density. The pillar calculator for all steel weight calculations in structural design, fabrication and cost estimation.

Inputs
Enter your values below
Result
Weight
—
Enter values and click Calculate
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Formula
length × width × thickness × density
Result unit: kg

Weight = Length × Width × Thickness × Density. The engine converts all dimensions to SI base units (meters). Result is in kilograms.

Introduction

Get steel weight in kg instantly for any shape from dimensions and density. Each shape uses its own cross-section formula: flat plate & sheet -> Length x Width x Thickness x Density; round bar -> pi/4 x D^2 x Length x Density; pipe & tube -> pi/4 x (OD^2 - ID^2) x Length x Density; beams, angles & channels -> section area x Length x Density. Choose carbon steel (7850 kg/m3), stainless or another grade, enter dimensions and read the result directly, or convert to pounds with the unit table below. This pillar page keeps the density and weight-per-meter references for the whole steel weight cluster - jump to the dedicated plate, round bar and pipe calculators for shape-specific worked examples and ordering guidance.

How This Calculator Works

Weight = Length × Width × Thickness × Density. The engine converts all dimensions to SI base units (meters). Result is in kilograms.

Steel weight is calculated using the fundamental formula: Weight = Volume x Density. For a steel plate: W = Length x Width x Thickness x Density. For pipes: W = pi/4 x (OD^2 - ID^2) x Length x Density. For solid rounds: W = pi/4 x D^2 x Length x Density. The engine converts all dimensions to SI base units (meters) and multiplies by material density (kg/m3) to give weight in kilograms.

Step-by-step process:

  1. Enter your input values in the calculator above
  2. The engine converts all inputs to SI base units (meters, kg, Pa)
  3. The formula is evaluated: length * width * thickness * density
  4. Result is formatted with the appropriate unit and precision

Calculation Example

A 1000×1000×10mm carbon steel plate weighs 78.5 kg

Inputs: length=1000, width=1000, thickness=10, density=7850
Result: 78.5 kg

Steel Density Reference Table

Density is the only material property needed for a weight calculation. Standard design values:

| Steel Grade | Density (kg/m3) | Density (lb/ft3) |

|---|---|---|

| Carbon steel (A36, S275, S355) | 7850 | 490 |

| Low alloy steel (e.g. ASTM A572) | 7850 | 490 |

| Stainless steel 304/304L | 7930 | 495 |

| Stainless steel 316/316L | 7990 | 499 |

| Stainless steel 410 | 7750 | 484 |

| Tool steel | 7700 - 8100 | 481 - 506 |

For structural design always use the density of the specified grade, not a generic value. The 300-series stainless steels are roughly 1-2% denser than carbon steel, which matters on large fabricated structures.

Weight Per Meter for Common Steel Sections

For rolled sections, weight per meter is cross-sectional area x density. Common values (carbon steel, 7850 kg/m3):

| Section | Weight (kg/m) |

|---|---|

| I-beam H200x200x8x12 | 50.5 |

| I-beam H300x300x10x15 | 94.0 |

| I-beam H500x300x11x18 | 119.0 |

| Channel UPN 100 | 10.6 |

| Angle L50x50x5 | 3.73 |

| Angle L75x75x8 | 9.03 |

| Round bar 20 mm dia | 2.47 |

| Round bar 50 mm dia | 15.4 |

| Pipe 114.3 x 6.3 mm | 16.8 |

| Pipe 168.3 x 7.1 mm | 28.2 |

| Steel plate 10 mm | 78.5 kg/m2 |

Section properties should be verified from the manufacturer's table for exact values; these are standard theoretical weights.

Unit Conversion for Steel Weight

| Convert | Multiply by |

|---|---|

| kg to lb | 2.20462 |

| lb to kg | 0.453592 |

| tonne (t) to kg | 1000 |

| kg/m to lb/ft | 0.671969 |

| lb/ft to kg/m | 1.48816 |

| kg/m2 to lb/ft2 | 0.204816 |

Example: a 500 kg steel beam weighs 500 x 2.20462 = 1102 lb. A 10 mm plate is 78.5 kg/m2 = 78.5 x 0.2048 = 16.1 lb/ft2.

Query Map: Steel Weight Formula & Calculator by Shape

All steel weight calculations reduce to Weight = Volume x Density, but the volume formula changes with the cross-section. Use the matching dedicated tool for each shape:

| Steel shape | Volume formula | Typical result |

|---|---|---|

| Flat plate / sheet | Length x Width x Thickness | 2000x1000x10mm plate = 157 kg |

| Pipe / tube | pi/4 x (OD^2 - ID^2) x Length | 114.3mm OD x 6.02mm wall = 16.1 kg/m |

| Round bar / solid rod | pi/4 x D^2 x Length | 50mm dia bar = 15.4 kg/m |

| I-beam / channel / angle | Section area x Length | H200x200x8x12 beam = 50.5 kg/m |

This page is the single entry point for the whole steel weight cluster. The dedicated plate, pipe and round bar calculators (see Related Calculators below) give shape-specific formulas, worked examples and ordering guidance, while this page keeps the density tables and section weight references in one place.

**Which page owns which query?** To keep each search intent on one page and avoid two pages competing for the same results: the Steel Plate Weight Calculator is the dedicated page for flat plate and sheet (weight per square meter, 4x8 sheets); the Round Bar Weight Calculator owns solid bars, rods and rebar; and the Pipe Weight Calculator owns pipe and tube weight per meter. Use this pillar page for beams, angles, channels, mixed sections, or whenever you are not sure which shape applies - it covers every shape with the volume x density method and routes you to the right dedicated tool.

Engineering Applications

  • •Structural steel fabrication and erection
  • •Equipment manufacturing and skid design
  • •Transportation planning and load calculation
  • •Cost estimation and material ordering
  • •Crane lift planning and rigging
  • •Bridge and building construction
  • •Shipbuilding and offshore platforms
  • •Material takeoff and quantity surveying
  • •Steel stock inventory management
  • •Freight, export and import documentation
  • •CNC cutting and fabrication cost estimation

Frequently Asked Questions

What is the density of carbon steel?

Carbon steel density is approximately 7850 kg/m3 (7.85 g/cm3). This is the standard value used for structural steel weight calculations. Mild steel (A36) and most carbon steels fall within 7830-7870 kg/m3.

What is the density of stainless steel 304?

Stainless steel 304 has a density of approximately 7930 kg/m3, slightly higher than carbon steel. Stainless 316 is about 7990 kg/m3. The 300 series stainless steels are typically 1-2% denser than carbon steel.

How do you calculate steel plate weight?

Steel plate weight = Length(m) x Width(m) x Thickness(m) x 7850 kg/m3. For example, a 1000x1000x10mm carbon steel plate weighs 78.5 kg. Use our calculator above for instant results with any dimensions.

How much does a steel I-beam weigh per meter?

An H500x300x11x18 I-beam weighs approximately 119 kg/m. A smaller H200x200x8x12 weighs about 50.5 kg/m. The weight per meter depends on the cross-sectional area and steel density (7850 kg/m3).

How accurate is this steel weight calculator?

This calculator gives theoretical weight based on nominal dimensions and standard density values. Actual weight may vary by 2-5% due to manufacturing tolerances, surface treatments (galvanizing adds ~3%), and material composition variations.

What is the weight of steel per square meter?

Steel plate weight per m2 = thickness(mm) x 7.85 kg/m2/mm. A 10mm steel plate weighs 78.5 kg/m2. A 6mm plate weighs 47.1 kg/m2. This quick formula works for flat steel plates.

How do you calculate steel angle weight?

Steel angle weight = (2 x leg_length - thickness) x thickness x length x 7.85 / 1000 (for equal leg angles in mm). For an L50x50x5 angle: (2x50 - 5) x 5 x 7.85 / 1000 = 3.73 kg/m. Use our calculator for precise results.

How much does a cubic meter of steel weigh?

A cubic meter of carbon steel weighs approximately 7850 kg (7.85 tonnes). Stainless steel 304 is about 7930 kg/m3 and stainless 316 about 7990 kg/m3. This density is the basis for all steel weight calculations.

How do I convert steel weight from kg to pounds?

Multiply the weight in kilograms by 2.20462 to get pounds. For example, 1000 kg of steel = 1000 x 2.20462 = 2204.6 lb. Our calculator results can be converted using the table in the Unit Conversion section.

How much does a 6mm steel plate weigh per square meter?

A 6 mm carbon steel plate weighs 6 x 7.85 = 47.1 kg/m2. The quick rule is: plate weight per m2 = thickness (mm) x 7.85 kg/m2/mm for carbon steel.

Which steel weight calculator should I use for my shape?

Flat plate: use the steel plate weight calculator (W = L x W x T x density). Pipe and tube: use the pipe weight calculator (W = pi x (OD - WT) x WT x density x L). Solid round bar: use the round bar weight calculator (W = pi x (D/2)^2 x density x L). This pillar calculator covers plates, beams, angles, channels and general sections with the volume x density method.

What is the weight formula for a steel sheet?

A steel sheet is a flat plate up to about 3-6 mm thick, so it uses the same flat plate formula: Weight = Length x Width x Thickness x Density. A 2000 x 1000 x 3 mm carbon steel sheet weighs 2 x 1 x 0.003 x 7850 = 47.1 kg (102 lb). For sheet weight use the dedicated steel plate weight calculator.

How much does a steel round bar weigh per meter?

Round bar weight per meter = pi/4 x D^2 x 7850 with D in meters (density 7850 kg/m3). A 20 mm round bar weighs pi/4 x 0.02^2 x 7850 = 2.47 kg/m, and a 50 mm bar weighs 15.4 kg/m. Use the dedicated round bar weight calculator for bars, rods and rebar.

Related Calculators

Steel Plate Weight CalculatorRound Bar Weight CalculatorPipe Weight CalculatorMetal Weight CalculatorStainless Steel Weight CalculatorAluminum Weight CalculatorCopper Weight CalculatorDensity CalculatorMaterial Volume Calculator

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Engineering Disclaimer: Calculations are for reference and educational purposes only. Always verify results independently for engineering design. See full disclaimer.
Reviewed by: Industrial Engineering Team
References: ASME B31.3, ASTM A36, Perry's Chemical Engineers' Handbook