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Metal weight calculator

Weight of steel, stainless, aluminium, copper and brass in plate, bar, tube, pipe, angle and beam from your own dimensions, with editable densities, a job list with totals and cost, and a rebar weight table.

FreeNo signupMetric + imperial

Planning aid. Weights are calculated from the dimensions and densities you enter, for estimating and quoting. Verify them against the manufacturer's or mill's data and the published section tables, and weigh when it matters (lifting, transport, loads). The qualified person on site is responsible.

Weight of one item

Shape

Material

Density, kg/m³ (editable)

Units

Length

Quantity

Cost per kg (optional, your currency)

Job list

Item	Qty	Each, kg	Total, kg	Cost

Rebar weight table

Bar length for the last column (m)

Diameter, mm	Area, mm²	kg/m	kg per bar

Imperial bar sizes (nominal diameter = size/8 in)

Bar size	Nominal diameter, in	lb/ft	kg/m

kg/m = d² / 162.2 with d in mm (steel at 7850 kg/m³). Real bars vary within the mill tolerance; ribs are included in the nominal figures used by the standards, so use the supplier's data for contracts.

Assumptions

Weight = cross-section area × length × density. Default densities: steel 7850, stainless steel 8000, aluminium 2700, copper 8960, brass 8500 kg/m³. Real alloys differ by a few percent, so edit the density to match your grade (for example, some stainless grades and aluminium alloys differ from these round numbers).
Rectangular tube can include an outer corner radius (a common cold-formed value is about 2 times the wall; check the supplier's table). With the radius at 0 the corners are sharp.
Angle, channel and I-beam use simple geometry (angle: t × (a + b − t); channel/I-beam: two flanges plus a web, parallel flanges). They ignore root radii and flange tapers, so they typically come out about 1 to 5 % low against rolled section tables. For tonnage, enter the area from the section table with the "Custom" shape.
Pipe: enter the outside diameter and wall thickness (OD and wall) and use the Pipe shape; weights do not include coatings, the water inside, or weld metal.