Ø40 Rebar — Weight, Area & Ordering Numbers
Ribbed reinforcing bar B500 per EN 10080 / DIN 488
Ø40 rebar weighs 9.86 kg per meter — the nominal value every supplier and engineer uses, from the 1,257 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 118.32 kg, so one tonne is about 8 bars or 101 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 | 40 mm |
| Nominal cross-section A | 1,257 mm² |
| Weight per meter | 9.86 kg/m |
Ordering Numbers
| Weight of a 6 m bar | 59.16 kg |
| Weight of a 12 m bar | 118.32 kg |
| Bars per tonne (12 m) | 8 |
| Meters per tonne | 101 m |
Frequently Asked Questions
How much does 40 mm rebar weigh per meter?
9.86 kg per meter (nominal, B500 per EN 10080). The quick site formula is d²/162: 40² / 162 ≈ 9.867 kg/m.
How many Ø40 bars are in a tonne?
About 8 bars of 12 m (118.32 kg each), or 16 bars of 6 m. One tonne of Ø40 is roughly 101 meters of bar.
What is the cross-section area of Ø40 rebar?
1,257 mm² nominal — the value used in reinforcement schedules. For example, 5 bars of Ø40 give 6,285 mm² of steel.
What is the US equivalent of Ø40 rebar?
The closest US bar is #14 (43 mm, 11.38 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