Rebar Calculator
Estimate the number of reinforcement bars, total length, and steel weight for a slab or wall grid using bar size and spacing.
Steel weight (kg)
157.04
Detalhamento
- Total bars
- 35
- Bars parallel to length
- 14
- Bars parallel to width
- 21
- Total bar length (m)
- 176.75
- Unit weight (kg/m)
- 0.89
Última atualização:
FAQ
How is rebar weight calculated?
Weight per meter follows the formula 0.00617 × d² (with d in millimeters), derived from steel's 7850 kg/m³ density. A Ø12 bar weighs about 0.89 kg/m, so 100 m of it is roughly 89 kg.
How do I convert spacing into a bar count?
Divide the dimension by the spacing and add one for the edge bar — a 4 m width at 30 cm spacing needs ⌊4/0.3⌋ + 1 = 14 bars running that direction. Both grid directions are counted, then a small lap allowance is added per bar.
How much extra steel should I order?
Add 5–10% for laps, ties, cutting waste, and bent bars at openings. This estimate already includes a modest 25 cm lap per bar, so round the final weight up to the nearest standard bundle size when purchasing.
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