Rebar Weight Calculator

What is Rebar Weight?

The Rebar Weight Calculator computes unit weight per meter and total batch mass for steel reinforcement bars based on volumetric steel density.

Formula

Unit Weight (kg/m) = d² ÷ 162.28 (where d is diameter in mm)
Total Mass (kg) = Unit Weight × Total Length (m) × Bar Count

Variables Explanation

- d: Nominal steel bar diameter in millimeters (mm).
- 162.28 Constant: Derived from (π/4) × 7850 kg/m³ ÷ 1000000.
- Length: Length of single bar in meters.

How to Calculate

1. Select standard rebar diameter (6mm to 32mm).
2. Input single bar length in meters.
3. Input quantity of bars.
4. View unit weight (kg/m), single bar mass, and total metric tons.

Worked Example

12mm Steel Bars: Quantity = 200 bars, Length = 12 meters each (2,400 total meters).
Unit Weight = 12² ÷ 162.28 = 0.887 kg/m.
Single Bar Weight = 0.887 × 12 = 10.64 kg.
Total Batch Mass = 2,400 × 0.887 = 2,128.8 kg (2.129 Metric Tons).

Practical Construction & Project Controls Use

Site steel delivery weight verification, preparing steel procurement purchase orders, and converting BBS cut lengths to tonnage.

Understanding the Result

Provides exact mass to cross-check supplier weighbridge delivery dockets.

Limitations & Assumptions

Calculates nominal theoretical weight. ASTM / IS manufacturing tolerances allow ±3% to ±7% rolling margin variation.