Bar Bending Schedule Calculator – BBS Steel Weight India
Our Bar Bending Schedule (BBS) calculator helps structural engineers and site engineers calculate the cutting length, total length, and steel weight for RCC reinforcement bars. Add multiple bar types with different diameters, lengths, and hook configurations.
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BBS Formulas
Weight of Bar (kg) = D² × L × 0.00617 / 1000 × 1000 Simplified: Weight (kg/m) = D² × 0.00617 / 100 × 100
Hook Addition = 9d per hook (standard 180° hook) Cutting Length = Clear Length + (9d × No. of hooks)
The popular formula used on site: Weight (kg) = D² × L / 162 where D is in mm and L is total length in metres. This gives weight in kg for mild steel bars.
Frequently Asked Questions
A BBS is a detailed document listing all reinforcement bars in an RCC structure — showing bar mark, diameter, shape code, cutting length, number of bars, and total weight. It is prepared by structural engineers for every RCC element.
Cutting Length = Clear Span + (9d × number of hooks) − (2d × number of 90° bends). For a 12mm bar with 2 standard hooks: add 2 × 9 × 12mm = 216mm = 0.216m to the clear span.
Weight = D² × 0.00617 = 12 × 12 × 0.00617 = 0.888 kg/m. For a standard 12-metre bar: 0.888 × 12 = 10.67 kg per bar.
Standard wastage allowance is 3–5% for cutting and bending losses. Our calculator uses 5% by default which is the standard accepted by most structural consultants in India.