Weight Calculator — Steel, Pipe, Plate & 40+ Materials

Calculate the weight of steel, concrete, timber, aluminium, pipe and 40+ materials from real dimensions. Metric and imperial, single piece or bulk quantity, with the exact formula printed alongside every result.

• Plate & Sheet
• Round Bar
• Pipe & Tube
• Direct Volume
• Quantity
• 40+ Materials

Material Mild steel Stainless steel Aluminium Copper Brass Bronze Cast iron Lead Zinc Titanium Concrete (normal) Concrete (reinforced) Concrete (lightweight) Cement (loose) Mortar Plaster Screed Sand (dry) Sand (wet) Gravel Crushed stone Topsoil Clay Limestone Granite Marble Ballast Brick (common) Brick (engineering) Concrete block Glass Slate Asphalt Bitumen Gypsum board Pine (softwood) Oak (hardwood) Birch Plywood MDF Particle board PVC HDPE Polystyrene (EPS) Polyurethane foam Fibreglass Nylon Water Ice Diesel Petrol Rubber

Density (kg/m³)

Length mm

Width mm

Thickness mm

Diameter mm

Length mm

Outer Ø mm

Wall mm

Length mm

Volume m³

Use this when you already know the volume — e.g. from a drawing or a quantity surveyor's take-off.

Quantity (pieces)

Results are at rest

Choose your material and shape, then press Calculate Weight.

Inputs changed — press Calculate Weight to refresh.

Total weight —

In pounds —

Volume —

Weight in tonnes—

Weight in US tons—

Per piece—

Density used—

Quantity—

Precision Auto 1 decimal 2 decimals 3 decimals

How the Weight Calculator Works

Four steps. No hidden assumptions, no black box.

1

Pick the material

Choose from 40+ construction materials. The density field auto-fills with the accepted value — you can override it if your spec says otherwise.

2

Choose the shape

Plate, round bar, pipe or direct volume. Each shape has its own volume formula, so you only enter real dimensions.

3

Enter dimensions & quantity

Add the number of pieces to get bulk weight for a delivery, a cut list or a quote.

4

Press Calculate Weight

Volume × density = weight. The formula used is printed with every result so you can verify it in seconds.

Formulas with Worked Examples

Every shape uses the same final step: Weight = Volume × Density. Only the volume formula changes.

Rectangular plate

V = L × W × T

Example: Steel plate 2 m × 1 m × 10 mm. V = 2 × 1 × 0.01 = 0.02 m³. W = 0.02 × 7850 = 157 kg.

Round bar

V = π × r² × L

Example: Steel bar Ø16 mm × 6 m. r = 0.008 m. V = π × 0.008² × 6 = 0.0012 m³. W = 0.0012 × 7850 = 9.47 kg.

Pipe / tube

V = π × (R² − r²) × L

Example: Steel pipe OD 114 mm, wall 6 mm, 6 m. V = π × (0.057² − 0.051²) × 6 = 0.0122 m³. W = 95.7 kg.

Weight formula

W = V × ρ

Where ρ (rho) is density in kg/m³. Steel: 7850, aluminium: 2700, concrete: 2400, oak: 700.

Calculation Examples from Site

Task	Given	Volume	Weight
Steel plate order	3 m × 1.5 m × 20 mm steel	0.09 m³	706.5 kg
Rebar delivery	200 × Ø16 mm × 6 m bars	0.241 m³	1894 kg
Concrete slab	8 m × 5 m × 0.15 m	6 m³	14,400 kg (14.4 t)
Aluminium sheet	2.4 m × 1.2 m × 3 mm	0.00864 m³	23.3 kg
Structural pipe	10 × OD 114 mm, 6 mm wall, 6 m	0.122 m³	957 kg
Hardwood beam	0.2 m × 0.2 m × 4 m oak	0.16 m³	112 kg
Sand load	3 m³ dry sand	3 m³	4800 kg (4.8 t)
Water tanker	10 m³ water	10 m³	10,000 kg (10 t)

Material Densities

The reference values used by this calculator. Multiply the volume in m³ by the density to get kilograms.

Material	Density (kg/m³)	kg per m³	lb per ft³
Metals
Mild steel	7850	7850	490.1
Stainless steel	8000	8000	499.4
Aluminium	2700	2700	168.6
Copper	8940	8940	558.1
Cast iron	7200	7200	449.5
Lead	11340	11,340	708.0
Concrete & Cement
Concrete (normal)	2400	2400	149.8
Concrete (reinforced)	2500	2500	156.1
Concrete (lightweight)	1800	1800	112.4
Cement (loose)	1440	1440	89.9
Mortar	2100	2100	131.1
Aggregates & Earth
Sand (dry)	1600	1600	99.9
Sand (wet)	1900	1900	118.6
Gravel	1600	1600	99.9
Crushed stone	1600	1600	99.9
Topsoil	1300	1300	81.1
Clay	1900	1900	118.6
Limestone	2600	2600	162.3
Granite	2700	2700	168.6
Masonry & Finishes
Brick (common)	1920	1920	119.9
Brick (engineering)	2200	2200	137.4
Concrete block	1400	1400	87.4
Glass	2500	2500	156.1
Slate	2800	2800	174.8
Asphalt	2300	2300	143.6
Timber & Wood
Pine (softwood)	500	500	31.2
Oak (hardwood)	700	700	43.7
Plywood	600	600	37.5
MDF	750	750	46.8
Plastics & Insulation
PVC	1400	1400	87.4
HDPE	950	950	59.3
Polystyrene (EPS)	30	30	1.9
Polyurethane foam	40	40	2.5
Fibreglass	1900	1900	118.6
Liquids & Other
Water	1000	1000	62.4
Ice	917	917	57.2
Diesel	850	850	53.1
Petrol	740	740	46.2
Rubber	1100	1100	68.7

Weight Unit Reference

How the units you see on delivery notes and drawings convert to each other.

Unit	Symbol	In kilograms	In pounds
Microgram	µg	0.000000001	0.0000000022
Milligram	mg	0.000001	0.0000022
Gram	g	0.001	0.0022
Kilogram	kg	1	2.20462
Metric tonne	t	1000	2204.62
Ounce	oz	0.0283495	0.0625
Pound	lb	0.453592	1
Stone	st	6.35029	14
US short ton	ton (US)	907.185	2000
UK long ton	ton (UK)	1016.05	2240

Site tip — steel rule of thumb

A 1 m² steel plate of 1 mm thickness weighs 7.85 kg. That single number lets you estimate any steel plate on site in seconds: Weight (kg) = Area (m²) × Thickness (mm) × 7.85. Round bars follow the same idea: Ø16 mm rebar is 1.58 kg/m, Ø20 mm is 2.47 kg/m, Ø25 mm is 3.85 kg/m.

People Also Ask

How do I calculate the weight of steel?

Multiply the volume in m³ by the density of steel (7850 kg/m³). For a plate: Length × Width × Thickness in metres, then × 7850. For a round bar: π × r² × Length × 7850, with r in metres.

What is the density of concrete in kg/m³?

Normal concrete is about 2400 kg/m³ (150 lb/ft³). Reinforced concrete is slightly heavier at 2500 kg/m³, while lightweight concrete can be as low as 1800 kg/m³.

How much does a 1 m² steel plate weigh?

Depends on thickness. At 1 mm: 7.85 kg. At 5 mm: 39.25 kg. At 10 mm: 78.5 kg. At 20 mm: 157 kg. The rule: Area × Thickness (mm) × 7.85.

How much does Ø16 mm rebar weigh per metre?

Ø16 mm rebar weighs approximately 1.58 kg per metre. A standard 6 m bar is 9.47 kg. For other diameters: Ø10 = 0.62 kg/m, Ø12 = 0.89 kg/m, Ø20 = 2.47 kg/m, Ø25 = 3.85 kg/m, Ø32 = 6.31 kg/m.

How do I convert weight from kg to lb?

Multiply kilograms by 2.20462262. So 100 kg = 220.46 lb, 1000 kg (1 t) = 2204.62 lb. Going the other way, multiply pounds by 0.45359237 to get kilograms.

What is the difference between a metric tonne and a US ton?

A metric tonne (t) is exactly 1000 kg. A US short ton is 2000 lb = 907.18 kg. A UK long ton is 2240 lb = 1016.05 kg. Always check which one a supplier's delivery note refers to — the gap is nearly 10%.

How do I calculate the weight of a pipe?

Volume = π × (outer radius² − inner radius²) × length. Inner radius = (outer diameter − 2 × wall thickness) ÷ 2. Then multiply by the density of the pipe material. For steel pipe, this gives weight in kg directly when dimensions are in metres.

Why does the material density matter so much?

Same volume, very different weight. A 1 m³ block weighs 2400 kg in concrete, 7850 kg in steel, 2700 kg in aluminium, 500 kg in pine. Choosing the wrong density can under- or over-order by a factor of 15.

Does the calculator add wastage?

No. This gives the theoretical weight of the finished item. For ordering, add a wastage allowance — 5% for standard steel plate, 10% for cut-to-size material, and up to 15% for complex fabricated steelwork.

Related Calculators

Construction Unit Converter Length, area, volume, weight and pressure between metric and imperial. → Concrete Calculator Volume and bag count for slabs, footings and columns. → Rebar Calculator Bar count, weight and cutting list for RC elements. → Slope Calculator Rise, run, percent grade, degrees and ratio 1:n. → Excavation Calculator Cut volume, truck loads and spoil for trenching. → Tile & Flooring Calculator Tile count, adhesive and grout for floor areas. →

References

• BIPM. The International System of Units (SI), 9th edition. Bureau International des Poids et Mesures, 2019.
• ISO 80000-1:2009. Quantities and units — Part 1: General. International Organization for Standardization.
• ASTM E380-22. Standard Practice for Use of the International System of Units (SI). ASTM International.
• BS EN 1991-1-1:2002. Eurocode 1: Actions on structures — Densities, self-weight, and imposed loads. BSI.
• ASCE/SEI 7-22. Minimum Design Loads and Associated Criteria for Buildings and Other Structures. American Society of Civil Engineers.
• ACI 318-19. Building Code Requirements for Structural Concrete. American Concrete Institute.
• BS 648:1964. Schedule of Weights of Building Materials. British Standards Institution.
• NIST Handbook 44. Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices. National Institute of Standards and Technology.
• AS/NZS 1170.1:2002. Structural design actions — Part 1: Permanent, imposed and other actions. Standards Australia.
• NIST Special Publication 811. Guide for the Use of the International System of Units (SI). National Institute of Standards and Technology.

Confirm density and wastage allowances against the project specification and supplier datasheet before ordering.