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Bar Bending Schedule — reinforcement details to a cutting-length steel order.
A 12-sheet Excel workbook that turns drawing reinforcement details into a proper bar bending schedule — cutting lengths with every bend deduction and hook allowance applied per IS 2502, laps and development lengths to IS 456, then a cutting optimiser and a steel order note. The offline, editable companion to the free BBS calculator.
Turns reinforcement details into a cutting-length schedule and steel order note, with every bend deduction and hook allowance applied per code.
Codes
The problem
Steel is ordered on centre-line lengths, and paid for as scrap.
The reinforcement on a drawing is dimensioned to its outside or centre-line — the numbers that describe the shape. But a bar is not cut to those numbers. When steel bends, the metal on the outside of the bend stretches and the neutral axis shifts, so the actual cutting length is shorter than the sum of the outside dimensions by a fixed deduction at each bend, plus an allowance added back for hooks. IS 2502 gives those deductions — roughly 2d at a 45° bend, 3d at a right-angle bend, and standard hook allowances. Ignore them and every stirrup and cranked bar is cut long; multiply that across a slab and it is real tonnage of avoidable scrap.
The other silent overrun is laps. A bar is only as long as it comes, so continuity is made by lapping — and the lap length is a code quantity (a multiple of bar diameter that depends on grade, concrete, and whether the zone is seismic under IS 13920), not a thumb figure. Under-lap and the joint is unsafe; over-lap and you have bought steel that does nothing. This workbook applies both — bend deductions and code laps — so the schedule reflects the bar that is actually cut and placed.
What's inside · 12 linked sheets
Every sheet, and what it does
Twelve linked sheets take a member’s reinforcement from shape code to a priced steel order, with the standards set once up front:
Full sheet list
Project & Standards, Shape Library, Shape Diagrams, Cutting Length Calc, Lap & Development, BBS, Bar Summary, Cutting Optimiser, Reconciliation, Order Note, Dashboard.
The standard bar shapes — straight, L-bend, cranked, stirrup, and the rest — each with its formula for total length from the entered dimensions, so you pick a shape and enter numbers rather than deriving geometry by hand.
The heart of it: applies the IS 2502 bend deductions and hook allowances to the shape’s outside dimensions to give the true cutting length — the number the bar bender actually cuts to.
Lap lengths and development lengths as code multiples of bar diameter, adjusted for grade and seismic detailing under IS 13920, so continuity and anchorage are correct rather than assumed.
The bar bending schedule proper: member, bar mark, diameter, shape, number, cutting length, and weight — the sheet you hand the bar-bending yard.
Total weight by diameter across the whole schedule — the figure that drives procurement and lets you check tonnage against the structural estimate’s ~4 kg/sqft thumb rule.
Nests the required cut lengths against standard 12 m stock to minimise off-cuts — the difference between ordering to the schedule and ordering to the scrap bin.
Scheduled steel against steel actually delivered and used, so wastage is measured, not guessed — and a contractor’s steel claim can be checked line by line.
A clean cut-to-length steel order by diameter and quantity, ready to send to the supplier straight off the schedule.
Who it's for
For whoever is accountable for the steel.
Reinforcement is usually the second-largest material cost in a frame and the easiest to over-order — this is for the people who carry that number:
- —Site engineers and bar-bending supervisors preparing schedules for the yard and checking cut lengths before the shear is switched on.
- —Contractors reconciling steel delivered against steel used, and defending or checking a steel wastage claim.
- —Structural draughtsmen and detailers producing schedules from their own drawings in an editable workbook.
- —Civil students and young engineers who want to see the IS 2502 deductions and IS 456 laps applied on real members, not just in a textbook.
Worked example
A 150-stirrup beam, and the metre-plus you would have wasted.
Scenario
A beam calls for 8 mm two-legged stirrups — 150 of them — around a cage 400 mm deep and 230 mm wide, with 25 mm cover. Add up the outside dimensions of the rectangle and you get a perimeter of about 1,180 mm; add the two hooks the drawing shows and the instinct is to cut each stirrup at roughly 1,320 mm.
The Cutting Length Calc corrects that. Over the outside perimeter there are three 90° bends and two 135° hook bends; applying the IS 2502 deductions (about 3d per right-angle bend) against the 10d hook allowances nets the true cutting length to close to 1,200 mm, not 1,320. That ~120 mm per stirrup, over 150 stirrups, is roughly 18 metres of 8 mm bar — about 7 kg — saved on a single beam.
Feed the whole cage — stirrups, main bars with their laps from the Lap & Development sheet — into the BBS and Bar Summary, and the Cutting Optimiser then nests those lengths against 12 m stock so the off-cuts are minimised too. The Order Note that comes out is a cut-to-length order the supplier can price directly, and the Reconciliation sheet later proves the steel that arrived is the steel that went in.
Get the toolkit
Bar Bending Schedule — ₹1,499
Delivered as an Excel (.xlsx) workbook in a .zip via a secure download link — shown here and emailed to you after checkout. Need all six? See the Site Operations Suite bundle.
Secure payment by Razorpay. This toolkit is delivered as an Excel (.xlsx) file, packaged as a .zip, via a secure download link shown here and emailed to you after checkout.