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Round Bar Weight Calculator — kg/m, lb/ft & Total Weight

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Diameter unit Bar diameter Piece length unit Piece length Number of pieces Whole pieces only.Material density (kg/m³) Carbon steel commonly uses 7,850 kg/m³; use documented alloy data when needed.Procurement allowance (%) Applied to order mass, not theoretical kg/m.Rate per kg (optional) 0 disables cost.Target mass unit Target mass (optional) Reverse-solves whole entered-length pieces.Supplier / measured kg per metre (optional) Reports variance without replacing theoretical geometry.

Calculated result

231.2 kg · 509.71 lb

3.8534 kg/m · 2.5893 lb/ft

490.874 mm² cross-section · 23.12 kg per entered-length piece

231.2 kg net batch mass

Enter rate/kg for procurement cost

Enter target mass for reverse whole-piece count

Enter supplier kg/m to compare table or delivered mass

Show the working

1. Area = π ÷ 4 × 25² = 490.874 mm².
2. Unit mass = 490.874 × 10⁻⁶ × 7,850 = 3.8534 kg/m.
3. Piece mass = 3.8534 × 6 = 23.12 kg.
4. Net batch = 23.12 × 10 = 231.202 kg.

This is theoretical mass for a solid plain round bar from nominal diameter and entered density. It is not a rebar schedule or structural-capacity calculation. Diameter tolerance, alloy chemistry, coatings and mill practice can change delivered mass; use certified supplier data for contractual, lifting-critical or safety-critical work.

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