Bar Bending Schedule (BBS): A Simple Guide for Contractors

By Vystra · 15 August 2026

Steel is usually the single most expensive material on an RCC job, so ordering and cutting it accurately protects real money. That's what a bar bending schedule does.

What a BBS contains

For every bar in the structure:

• Bar mark and location (slab, beam, column)
• Diameter (8, 10, 12, 16, 20 mm…)
• Shape and bends
• Cutting length
• Number of bars
• Total length and weight

Cutting length basics

Cutting length = member length + development lengths + hooks − bend deductions.

• Standard hook adds 9d per hook.
• A 90° bend deducts 2d; a 45° bend deducts 1d (d = bar diameter).

Weight from length

Use the D²/162 rule: weight per metre = D² ÷ 162 (D in mm). A 12 mm bar = 144 ÷ 162 = 0.89 kg/m.

Why it pays off

A good BBS commonly cuts steel wastage from 5–7% down to 2–3%. On a house-sized project that's tens of thousands of rupees.

Order and track from the schedule

Once you have quantities, tie them to the project. Vystra's steel calculator gives per-bar weights, and material tracking records what you actually bought against the plan — so wastage shows up as a number, not a surprise.

Frequently asked questions

What is a bar bending schedule?

A bar bending schedule (BBS) is a list of every reinforcement bar in a structure — its shape, size, cutting length, number and weight — used to order and cut steel accurately.

Why is BBS important?

A BBS reduces steel wastage, gives an accurate material order, speeds up cutting and bending on site, and makes checking the work easier.

How do you calculate cutting length?

Cutting length = clear span + development length + hooks/bends − bend deductions. Standard hook = 9d and 90° bend deduction = 2d, where d is the bar diameter.