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Construction Intelligence · Steel

Bar Bending Schedule Calculator

All IS 2502:2014 shapes · IS 456:2000 development lengths · Cutting optimisation · Export to CSV & PDF. Works offline — data stays on your device.

⚙ Project Settings & Defaults (click to collapse)
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BBS Calculator

Enter bar details below — cut length, unit weight, development length, and procurement quantity calculate automatically.
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Bar Bending Schedule — Entry Table
Auto-saved
# Bar Mark * Member ID Floor Shape Grade * Dia * (mm) A (mm) B (mm) C (mm) D (mm) Hook No. Bars * Spacing (mm) Cut Length (mm) Unit Wt (kg/m) Total Len (m) Total Wt (kg) Dev.Len (mm) Lap Len (mm) Proc.Qty (kg) Remarks Actions
TOTALS — — — —

* Required. Click shape icon to change. Tab between fields. Ctrl+Enter adds a row.

Weight by Diameter
Dia (mm)GradeTotal BarsTotal Length (m)Total Weight (kg)Total Weight (T)Procurement (kg)Cost (₹)
Weight by Member Type
Member TypeFloorBar ItemsTotal Weight (kg)Procurement (kg)
Cutting Optimisation (IS 2502 / First Fit Decreasing)

Select a diameter group to see the optimal cutting plan from 12m stock bars. This minimises scrap using the First Fit Decreasing (FFD) bin packing algorithm.

Cost Estimation — Enter Rates

All rates are editable. Binding wire estimated at 1.2% of steel weight. GST at 18% on labour/fabrication charges.

Cost Breakdown
Development Length Calculator — IS 456:2000 Cl.26.2.1

Formula: Ld = φ × (0.87 × fy) / (4 × τbd). For HYSD (deformed) bars, τbd is enhanced by ×1.6 per IS 456 Table 5 Note.

Development Length Reference Table (Tension, Class A — Ld in mm)

Factor = Ld/dia. Per IS 456:2000 Table 5 × IS 1786 (HYSD ×1.6 bond enhancement). Tension Class A: multiply Ld by 1.3 for lap length.

Dia (mm) M20 Fe415M20 Fe500 M25 Fe415M25 Fe500 M30 Fe415M30 Fe500 M35 Fe415M35 Fe500

IS Standards Reference

Bend Deductions — IS 2502:2014 Table 1
Bend AngleDeduction per BendExample (d=16mm)
45°1.0 × d16 mm
90°2.0 × d32 mm
135°3.0 × d48 mm
180°4.0 × d64 mm
Hook Additions per Hook End
Hook TypeAddition per EndReference
90° Standard Hook9 × dIS 456 Cl.26.1.2
135° Stirrup Hook10 × dIS 456 Cl.26.5.2.2
180° Full Hook4 × dIS 2502
Unit Weights — IS 1786 (d²/162.28 kg/m)
Dia (mm)kg/mkg/12m bar
Bond Stress (τbd) — IS 456:2000 Table 5

Plain bars. HYSD (deformed) bars: multiply by 1.6. For compression: Ld × 0.8.

Concrete Gradeτbd Plain (N/mm²)τbd HYSD (×1.6)
M151.01.60
M201.21.92
M251.42.24
M301.52.40
M351.72.72
M401.93.04
M452.13.36
M502.54.00
⚠ Seismic Zones III / IV / V — IS 13920:2016 Additional Requirements

This calculator implements IS 456:2000 and IS 2502:2014. For seismic Zone III, IV or V, IS 13920:2016 imposes additional requirements — these must be verified with your structural engineer and are not auto-applied here.

ElementIS 456 StandardIS 13920 Seismic Requirement
Stirrup hook angle90° or 135°135° mandatory (not 90°) per Cl.6.3
Beam stirrup spacing (hinge zone)min(d/2, 300mm)min(d/4, 8×bar dia, 24×tie dia, 300mm) per Cl.6.3.5
Column confinement zone length (Lo)—max(larger column dim, clear height/6, 450mm) at each end per Cl.7.4
Min longitudinal steel (column)0.8%1% minimum per Cl.7.2.1
Max longitudinal steel (column)6%4% at lap locations per Cl.7.2.1
Column lap locationAnywhereMiddle half of column height only per Cl.7.3.1
Lap length (seismic zones)1.3 × Ld1.5 × Ld per Cl.7.3.2
Shear wall min steel (each face)0.15%0.25% per Cl.9.1

IS 13920:2016 — Ductile Design and Detailing of RC Structures Subjected to Seismic Forces. Consult your structural engineer for project-specific seismic requirements.

Frequently Asked Questions

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Frequently Asked Questions

What is a bar bending schedule?▾
A bar bending schedule is the cutting and bending list for the reinforcement in a structure. For each bar mark it records the shape code, diameter, the bending dimensions, the cut length, how many are needed and the total weight — so steel can be ordered, cut and bent correctly before it reaches the site.
How is the cutting length of a bar calculated?▾
Cutting length is the sum of the straight lengths along the bar, plus any hook allowances, minus the bend deductions. Steel stretches at a bend, so the flat length needed is always shorter than adding the outside dimensions together. Skipping the deduction is what makes a schedule over-order.
What bend deduction does this calculator use?▾
The deductions from IS 2502:2014 — 2d for a 45° bend, 2d for 90°, and 3d for 135°, where d is the bar diameter. The source is stated on the page rather than left implicit, because a schedule whose deductions cannot be traced to a code is not checkable.
What hook length should I use?▾
It depends on the bend angle: 9d for a 90° hook, 10d for 135°, and 4d plus the bend allowance for a 180° hook, measured from the end of the straight portion. All three are selectable here rather than assumed.
How is development length calculated?▾
From IS 456:2000 — Ld = (φ × σs) / (4 × τbd), where φ is the bar diameter, σs the stress in the bar, and τbd the design bond stress from Table 5 for the concrete grade. Deformed bars in tension take the 60% increase the code allows, which is why a Fe500 bar in M25 does not need the length a plain bar would.
Which IS 2502 shape codes are supported?▾
Eighteen shape codes are implemented, covering straight bars, L and U bends, cranked bars, stirrups and links, spirals and helices. Each has its own dimension fields and its own cutting-length formula rather than one generic formula applied to every shape.
How do you calculate the weight of a reinforcement bar?▾
Weight per metre is d² / 162, with d in millimetres — a 12 mm bar is 0.888 kg per metre. That constant is the density of steel expressed for a round section, so it holds for any grade; Fe415 and Fe500 of the same diameter weigh the same, they differ in strength, not mass.
Does this calculate cutting waste and optimise bar lengths?▾
Yes. Cut lengths are packed into standard stock lengths using a first-fit-decreasing algorithm, so the schedule shows how many stock bars are required and what offcut remains. On a large pour that is usually a larger saving than any rate negotiation.
Can I export the schedule?▾
Yes — CSV with the full standard column set, and a print layout in the IS format that a bar bender and a checker both expect to see. Nothing is behind a sign-up.
Is my data uploaded anywhere?▾
No. The calculator runs entirely in your browser and the schedule is kept in your own browser storage. If you are signed in you can choose to save a schedule to a project; otherwise nothing leaves the device.
Is this BBS calculator free?▾
Yes, with no sign-up and no limit on the number of bars. It is published by Rebota, a construction ERP, and the tool works fully whether or not you ever use the ERP.
This is one item, on one day.Rebota holds consumption against your BOQ on a live stock ledger, so wastage shows up while you can still act on it.
See it on real stock →