Ø20 Rebar — Weight, Area & Ordering Numbers
Ribbed reinforcing bar B500 per EN 10080 / DIN 488
Ø20 rebar weighs 2.47 kg per meter — the nominal value every supplier and engineer uses, from the 314 mm² nominal cross-section at 7,850 kg/m³ (ribs are already accounted for: the nominal diameter is defined so that mass, not outside size, matches). A standard 12 m mill bar weighs 29.64 kg, so one tonne is about 33 bars or 405 meters.
These numbers are what you need to turn a cutting list in meters into an order in kilograms — and to check a delivery note against what actually arrived on the truck.
Size & Weight
| Nominal diameter | 20 mm |
| Nominal cross-section A | 314 mm² |
| Weight per meter | 2.47 kg/m |
Ordering Numbers
| Weight of a 6 m bar | 14.82 kg |
| Weight of a 12 m bar | 29.64 kg |
| Bars per tonne (12 m) | 33 |
| Meters per tonne | 405 m |
Frequently Asked Questions
How much does 20 mm rebar weigh per meter?
2.47 kg per meter (nominal, B500 per EN 10080). The quick site formula is d²/162: 20² / 162 ≈ 2.467 kg/m.
How many Ø20 bars are in a tonne?
About 33 bars of 12 m (29.64 kg each), or 67 bars of 6 m. One tonne of Ø20 is roughly 405 meters of bar.
What is the cross-section area of Ø20 rebar?
314 mm² nominal — the value used in reinforcement schedules. For example, 5 bars of Ø20 give 1,570 mm² of steel.
What is the US equivalent of Ø20 rebar?
The closest US bar is #6 (19.05 mm, 2.235 kg/m). US sizes are numbered in eighths of an inch, so exact matches are rare — check the required steel area, not just the diameter.
Values are entered from the governing standard’s published tables and cross-checked programmatically against its mass and section formulas before publication. Spotted an error? Write to advertising@metalabout.net — verified corrections ship within days. About