Steel & Reinforcement

Bar Bending Schedule (BBS): How to Calculate Cutting Length and Weight

A Bar Bending Schedule converts reinforcement drawings into measurable bar marks, shapes, quantities, lengths and weights. A calculator can support basic checks but not replace approved detailing.

Published August 14, 2026 · CivilToolsIndia Editorial Team

What is a BBS?

A BBS normally records bar mark, diameter, shape, quantity, cutting length and total weight. It supports fabrication, procurement and site control.

Basic weight formula

Once total bar length is known, theoretical weight = D² × total length ÷ 162.

Worked example

Twenty 12 mm bars with a 4.5 m cutting length have 90 m total length. Theoretical weight is about 12² × 90 ÷ 162 = 80 kg.

How to use the calculator

Enter diameter, base length, number of bars and cutting length as applicable. Review total length and theoretical weight.

Why detailed BBS matters

Hooks, bends, anchorage, laps, cover and shape details affect cutting lengths and must come from approved drawings and detailing rules.

Use the BBS Bar Cutting Length & Weight Calculator

Enter your project values and get a quick preliminary calculation.

Open Calculator →

Engineering note: Results are intended for preliminary estimation, planning and learning. Verify measurements, drawings, specifications, current rates, applicable standards and site conditions before construction or safety-critical decisions.

Frequently Asked Questions

What is BBS?

Bar Bending Schedule is a reinforcement schedule of bar marks, shapes, quantities, lengths and weights.

How is steel weight calculated?

After total length is known, D² × L ÷ 162 gives theoretical weight.

Does it determine hook length?

Only when the correct length is supplied in the input; final detailing follows project drawings.

Can it replace drawings?

No.