Rebar Weight Calculator
Enter rebar diameter and length (with quantity) to compute weight per metre (d²/162) and total weight for material ordering and acceptance.
Input Data
Results
At a glance:Round rebar weight per metre (kg/m) ≈ diameter²(mm) ÷ 162, derived from cross-section πd²/4 × steel density 7,850 kg/m³ ÷ 1,000,000. Total weight = weight per metre × bar length × quantity. This is theoretical; actual bars have negative tolerance, so verify against the nominal table when purchasing.
Formula
Weight per metre = diameter² / 162 (kg/m)
Total weight = weight per metre × length × quantity
$$w = \frac{d^2}{162}$$$$W = w\,L\,n$$How to Use
- Enter the rebar diameter (mm).
- Enter the single bar length (m) and quantity.
- The tool outputs weight per metre and total weight.
Case Studies
Ø16 beam bars
Ø16, 6 m, 10 bars.
1.58 kg/m; total about 94.8 kg.
Ø25 column bars
Ø25, 4 m, 20 bars.
3.86 kg/m; total about 309 kg.
FAQ
Is d²/162 accurate?
It is the common approximation; error versus exact πd²/4×7.85 is very small (<0.5%), widely used in practice.
How does this differ from the slab reinforcement calculator?
This version computes weight by a single diameter and length (general); the slab reinforcement version estimates total bars and weight by bidirectional spacing.
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References
Content review: Calculatorism Construction Team. Results are for reference only; please refer to the relevant authorities for the official figures.