100 stirrups Ø8 for a 30 × 30 cm section, 3 cm cover, 10-diameter hooks
Core perimeter 2 × (24 + 24) = 96 cm plus two hooks of 8 cm: 112 cm per stirrup, 112 m in total; with 5 % waste 117.6 m, about 46.4 kg and 10 bars of 12 m.
Stirrup and bent rebar length calculator
Pick the shape of the bar, enter the diameter, the number of bars and the dimensions read from the engineer’s drawings: PRAXAO returns the cut length of one bar, the total length, the steel weight with waste and the number of 12 m bars to buy. Hook length and bend deduction are editable assumptions.
Enter the dimensions to see the drawing.
Calculation results
Fill in the fields to see the result.
Preliminary estimate from the values entered: not a structural validation and not an execution plan. Check the local rules and the manufacturers’ data.
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Results are provided for information. Check tax rates and legal requirements that apply to you.
How to use it
- Choose a closed stirrup, an L bar, a U bar or a straight bar.
- Enter the diameter, the number of bars and the dimensions (section and cover for a stirrup, legs for an L or U bar).
- Check the hook length and the bend deduction against your drawings.
- Read the cut length, the total length, the weight and the commercial bars to buy.
Examples
Frequently asked questions
Does it choose the diameter or the spacing?
No. It converts the dimensions of a bar mark read from the drawings into a cut length and a weight. Diameters, spacings, cover and anchorage lengths come from the structural engineer.
What is the bend deduction?
The length lost at each bend when dimensions are measured outside the bar. It is set to 0 by default, meaning the dimensions are taken as developed lengths; enter your own value if your bar schedule uses one.
How is the weight computed?
Weight per metre = cross-section × steel density (7,850 kg/m³), then multiplied by the total length with waste.
Guides to go further
BUILNORA
Rebar weight per metre: how to estimate the steel of a job
Weight per metre by diameter, total length, laps, waste and 12 m bars: the method to order reinforcing steel, with an example.
BUILNORA
How to take off a column, a footing and a beam in detail
Concrete, formwork, pours, stripping and reinforcement by mark for a column, footings and a beam, with a worked example.
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