A quick reference for reinforcing-steel sizes and weights. Use this chart to estimate tonnage, plan orders and convert between length and weight for B500B, Gr60 and BS 4449 rebar. Weights are nominal per EN 10080 / ISO 6935 and apply across grades (weight depends on diameter, not grade).
Rebar weight per metre by diameter
| Diameter | Nominal weight (kg/m) | Cross-section (mm²) | Metres per tonne |
|---|---|---|---|
| 6 mm | 0.222 | 28.3 | ~4,505 |
| 8 mm | 0.395 | 50.3 | ~2,532 |
| 10 mm | 0.617 | 78.5 | ~1,621 |
| 12 mm | 0.888 | 113.1 | ~1,126 |
| 14 mm | 1.208 | 153.9 | ~828 |
| 16 mm | 1.578 | 201.1 | ~634 |
| 20 mm | 2.466 | 314.2 | ~406 |
| 25 mm | 3.854 | 490.9 | ~259 |
| 32 mm | 6.313 | 804.2 | ~158 |
| 40 mm | 9.865 | 1,256.6 | ~101 |
How to use this chart
Multiply weight/metre by total length to get tonnage (e.g. 1,000 m of 12 mm ≈ 0.888 t). Divide your required tonnage by weight/metre to get length. Nominal weights are based on steel density of 7,850 kg/m³ and apply to B500B, Gr60 and BS 4449 alike — grade affects strength, not weight.
Order rebar by weight or length
We supply mill-certified rebar in all diameters (6–40 mm), as straight bar or coil, export-direct with documentation handled. Send your diameters, lengths or tonnage and destination port for a written quote in 24h.
Frequently Asked Questions
How much does 12 mm rebar weigh per metre?
Nominal 0.888 kg/m — so 1,000 m weighs about 0.888 tonnes. Weight is the same for B500B, Gr60 and BS 4449 at a given diameter.
How many metres of rebar are in a tonne?
It depends on diameter: about 2,532 m for 8 mm, 1,126 m for 12 mm, 634 m for 16 mm and 259 m for 25 mm.
Does rebar grade affect weight?
No — weight depends only on diameter (and steel density). Grade (B500B, Gr60, BS 4449) affects strength and ductility, not weight.