Bend Deduction Calculator

This calculator determines bend deduction in reinforcement bars according to bend angle and bar diameter.

Input Details

Bar Diameter (d) in mm 6 mm 8 mm 10 mm 12 mm 16 mm 20 mm 25 mm Diameter of reinforcement bar.

Bend Angle 45° Bend 90° Bend 135° Bend 180° Bend Select the bend angle of reinforcement bar.

Deduction Coefficient Enter coefficient manually according to project requirement or code practice.

Calculation Result

Formula Used

Bend Deduction = Coefficient × Bar Diameter

Standard Practical Values:

• 45° Bend → 0.42d
• 90° Bend → 0.84d
• 135° Bend → 1.26d
• 180° Bend → 1.68d

Important: Bend deductions are practical detailing values used in Bar Bending Schedule (BBS) preparation.

Bend Deduction Reference Table

Bend Angle	Deduction
45°	0.42d
90°	0.84d
135°	1.26d
180°	1.68d

Explanation of Values

• d: Diameter of reinforcement bar.
• Coefficient: Standard multiplier used for bend deduction.
• Bend Deduction: Reduction in actual bar length due to bending.

Reference Codes

• IS 2502 : 1963 – Bending and Fixing of Reinforcement Bars.
• SP 34 – Handbook on Reinforcement Detailing.
• IS 456 : 2000 – Plain and Reinforced Concrete Code.

Developed By

Mohan Dangi (Gold Medalist)