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Steel Weight Calculator

Calculate the unit weight of steel rebar, plates, pipes, angles, and channels. Uses precise density (7,850 kg/m³) and standard formula d²/162.28 for rebar.

Enter your values

mm
mm
mm
m

Result

Total Weight
5.32 kg
1 piece, 6 m each
Weight Per Piece
5.324 kg
Weight Per Metre
0.887 kg/m
Approximate Cost
₹373
@ ₹70/kg (varies daily)

* Standard mild steel density: 7,850 kg/m³.

* Rebar formula d²/162.28 comes from ((π/4) × d² × density × 1000) / 1,000,000.

* Steel prices fluctuate daily — verify with local supplier before ordering.

Quick answer

Steel weight calculator covers rebar (TMT bars), MS plates, pipes, and square bars. Uses standard mild steel density (7,850 kg/m³) and the universal d²/162.28 formula for rebar weight per metre.

What is Steel Weight?

Steel is sold by weight, not by length or piece. So estimating any steel order — TMT bars for RCC, MS plates for fabrication, pipes for railings — comes down to converting dimensions to kilograms.

Rebar formula: weight per metre = d²/162.28, where d is the diameter in mm. So a 12mm bar weighs 12²/162.28 = 0.888 kg/m. The 162.28 constant comes from (π/4 × density × 10⁶), encapsulating all the geometry and mild steel density (7,850 kg/m³) into one number.

Plates are simpler: length × width × thickness × density. Pipes need the cross-sectional area of the steel ring (annulus). Square bars are side² × length × density. The calculator handles each type with the right formula.

Density × volume, by shape

Formula
Rebar (per metre): d² / 162.28 (kg/m, d in mm) Plate: L × W × t × 7850 Pipe: π × ((D/2)² − ((D−2t)/2)²) × L × 7850 Square bar: side² × L × 7850
d, D
Diameter (mm)—outer diameter for pipes
t
Thickness—for plates and pipes
L, W
Length, Width—in metres
7,850
MS density (kg/m³)—mild steel
Worked example
TypeRebar (TMT)
Diameter12 mm
Length6 m
Quantity100 bars
Per-metre weight = 12² / 162.28 = 0.888 kg/m
Per bar = 0.888 × 6 = 5.33 kg
Total = 5.33 × 100 = 533 kg
➜ 533 kg total — at ₹70/kg ≈ ₹37,310

How to use this calculator

Pick steel type, enter dimensions, get total weight.

  1. Pick steel type

    Rebar (round TMT), MS plate (rectangular), MS pipe (hollow), or square bar.

  2. Enter dimensions

    Diameter for rebar/pipe (mm). For plates: thickness, width, length. For pipes: outer dia + wall thickness.

  3. Enter length and quantity

    Length in metres per piece, quantity = number of pieces.

When you need steel weights

Construction rebar order

Calculate total weight before ordering TMT bars for an RCC slab. 8-12mm for slabs, 16-25mm for columns.

Fabrication estimates

MS plates and angles for fabrication shops. Calculator gives weight to multiply by per-kg rate.

Pipe / railing projects

Compute weight of MS pipes for staircase railings, gates, fences.

Verify supplier weight

When the truck arrives, weigh-bridge weight should match calculator. Catch under-supply before paying.

Glossary

TMT (Thermo-Mechanically Treated)
Modern rebar — heat-treated for higher strength + ductility. Standard for Indian RCC.
MS (Mild Steel)
Common construction steel grade. Density 7,850 kg/m³.
Rebar
Steel reinforcement bars embedded in concrete. Round, ribbed for grip.
Plate
Flat rectangular steel sheet. Used in fabrication, machinery.
Annulus
Ring-shaped cross-section of a pipe. Outer area minus inner area.

Frequently asked questions

What is the d²/162.28 formula?
It's a shortcut for rebar weight per metre, where d is diameter in mm. The full derivation: (π/4) × (d/1000)² × 7850 = d² / 162.28 kg/m. So a 12mm bar is 12²/162.28 = 0.888 kg/m.
How accurate is the weight calculation?
Within ±2% for standard mild steel. Stainless steel (7,930 kg/m³), galvanised steel, and high-strength steels have slightly different densities — refer to manufacturer specs for precise weights.
What is the weight of 1 metre of steel bar (8mm, 10mm, 12mm, 16mm)?
Using the standard d²/162 formula (weight in kg/m = diameter² ÷ 162): 8mm ≈ 0.395 kg/m, 10mm ≈ 0.617 kg/m, 12mm ≈ 0.889 kg/m, 16mm ≈ 1.580 kg/m, 20mm ≈ 2.469 kg/m, 25mm ≈ 3.858 kg/m. Multiply by the bar length for total weight.
How much does one bundle of 8mm steel weigh?
A standard bundle of 8mm TMT bars has 10 rods of 12 metres each — 120 metres total. At 0.395 kg/m that is about 47.4 kg per bundle. Bundle sizes vary by brand (10mm is commonly 7 rods ≈ 51.8 kg; 12mm commonly 5 rods ≈ 53.3 kg), so confirm the rod count on the invoice.
What is the weight of 1 cubic metre of steel in kg?
Solid mild steel has a density of about 7,850 kg per cubic metre — that is 7.85 tonnes per m³. This is the density constant behind the d²/162 bar formula and applies to TMT rebar, plates and sections alike.
Disclaimer: Results are estimates based on the inputs you provide. They are not professional advice. For consequential decisions — financial, tax, medical, or legal — verify with a qualified professional.

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