Rebar Weight Calculator — Quick & Accurate

Calculate rebar weight using diameter, length and quantity

This calculator uses the standard formula W (kg/m) = 0.006165 × d² where d is diameter in millimetres. Enter the values to get weight per metre, per bar and total weight.

Bar Diameter (mm)

Length per bar (m)

Quantity (number of bars)

Output Units kg tonnes

Calculate Rebar Weight Reset

Result:

Enter values and click Calculate Rebar Weight.

Standard Formula

Weight per metre (kg/m) = 0.006165 × d² where d is in millimetres. Alternatively, weight ≈ d² / 162.

Important Notes

The formula assumes standard steel density (~7850 kg/m³). For billing or certified results, verify with supplier weights or scales. Allow for cutting loss and wastage when ordering.

How the Rebar Weight Calculator Works

A Rebar Weight Calculator estimates the mass of reinforcing steel (rebar) based on bar diameter and length. It’s essential for contractors, engineers, suppliers, and estimators to quickly determine material weight for ordering, transport, lifting, and cost calculations. The calculator uses the bar’s cross-sectional area and the density of steel to convert dimensions into weight.

Standard Formula

The commonly used engineering formula for steel rebar weight per metre is:

Weight per metre (kg/m) = 0.006165 × d²

where d is the bar diameter in millimetres (mm).
A convenient alternative form used in the industry is:

Weight per metre (kg/m) ≈ d² ÷ 162

Both formulas produce essentially the same result (162 ≈ 1 / 0.006165).

To find total weight:

Total weight (kg) = Weight per metre (kg/m) × Length (m) × Number of bars

Step-by-Step Calculation

1. Measure or select the rebar diameter (mm).
2. Use the formula to get weight per metre.
3. Multiply by the bar length in metres.
4. Multiply by the number of bars to get total mass.

Example

For a 16 mm rebar, 12 m long, with 10 bars:

• Weight per metre ≈ 0.006165 × 16² = 0.006165 × 256 ≈ 1.58 kg/m
• Weight per bar = 1.58 × 12 = 18.96 kg
• Total for 10 bars = 18.96 × 10 = 189.6 kg

Why Use This Calculator?

• Simplifies ordering and reduces waste.
• Helps calculate transport and lifting requirements.
• Improves accuracy in cost estimation and structural planning.
• Saves time compared to manual calculations for large projects.

Important Notes

• The formula assumes standard steel density (~7,850 kg/m³). Different alloys or coatings slightly change weight.
• Round up orders slightly to cover cutting waste and overlaps.
• For certified weight records or billing, verify with supplier weights or certified scales.