1
Straight Bar
L Cutting length equals the span length with no deductions.
Where:
L
= Total length of the bar in mm Steel Quantity & BBS Generator v1.0
IS 2502:1963 Compliant • Kerala Market Standards
⚠️
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This tool provides estimates based on general algorithms. It does NOT constitute professional engineering advice. Structures must be verified by a licensed engineer per IS Codes. By using this tool, you agree to indemnify K-First against any financial losses.
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Shape
Dia
Dimensions (mm)
Nos
Output
Cutting Length Formulas IS 2502:1963
Hook Allowance: 10d (10 × bar diameter) •
Bend Deduction: 2d (2 × bar diameter)
2
L-Bar (Bent-Up Bar)
A + B - 2d Sum of horizontal and vertical legs, minus bend deduction.
Where:
A
= Horizontal leg length in mm, B
= Vertical leg length in mm, d
= Bar diameter in mm 3
Rectangular Stirrup
2(A + B) + 12d Perimeter of stirrup plus hook allowances. Calculated as 2 hooks × 10d minus 4 bends × 2d = 20d - 8d = 12d.
Where:
A
= Outer width of stirrup in mm, B
= Outer depth of stirrup in mm, d
= Bar diameter in mm 4
Circular Ring
πD + 20d Circumference of ring plus two hooks at 10d each.
Where:
D
= Outer diameter of ring in mm, d
= Bar diameter in mm, π
= 3.14159 Worked Examples
Calculate Stirrup Cutting Length
Column stirrup for a 300mm × 450mm column with 8mm bars and 25mm cover
Calculate Stirrup Cutting Length
Column stirrup for a 300mm × 450mm column with 8mm bars and 25mm cover
1
Calculate outer dimensions
A = 300 - (2 × 25) = 250mm, B = 450 - (2 × 25) = 400mm 2
Apply stirrup formula
2(A + B) + 12d = 2(250 + 400) + 12(8) 3
Solve
= 2(650) + 96 = 1300 + 96 = 1396mm Result: 1396mm (1.396m)
0.55 kg per stirrup (1.396m × 0.395 kg/m)
Calculate L-Bar for Beam Bottom
Bent-up bar with 2000mm horizontal and 400mm vertical leg, 12mm diameter
Calculate L-Bar for Beam Bottom
Bent-up bar with 2000mm horizontal and 400mm vertical leg, 12mm diameter
1
Apply L-Bar formula
A + B - 2d = 2000 + 400 - 2(12) 2
Solve
= 2400 - 24 = 2376mm Result: 2376mm (2.376m)
2.11 kg per bar (2.376m × 0.888 kg/m)
How to Calculate Steel Weight (IS 2502)
This tool complies with IS 2502:1963 standards used in Kerala. It automatically handles cutting lengths for 8mm, 10mm, and 12mm bars.
One-Way vs Two-Way Slab Logic
Our Smart Generator automatically detects the slab type based on the aspect ratio (Ly/Lx). If the ratio is ≥ 2.0, it treats it as a One-Way slab. If < 2.0, it calculates as a Two-Way slab.