Steel Calculator - Free Online Tool
Professional-grade steel calculator calculator for accurate material estimation. Get instant results with industry-standard formulas and proper wastage allowances.
Calculate Your Steel Calculator Requirements
m
Length of concrete slab
m
Width of concrete slab
Select rebar diameter
mm
Center-to-center spacing of bars
Your Calculation Results
Enter your measurements above to see calculation results here.
Results will update automatically as you type.
How the Steel Calculator Calculation Works
Steel reinforcement calculation is based on structural requirements, spacing, and lap lengths according to building codes.
Formula:
Steel Weight = (Bar Length × Cross-sectional Area × Steel Density) + Lap AllowanceStandard steel density is 7850 kg/m³. Lap lengths are typically 40-50 times bar diameter. Includes 2% wastage for cutting.
Example Calculation
Real-World Scenario:
Calculating steel reinforcement for a concrete slab 10m × 8m × 0.15m thick using 12mm bars at 200mm spacing.
1Main bars (10m direction): 8m ÷ 0.2m = 40 bars × 10m = 400m
2Distribution bars (8m direction): 10m ÷ 0.2m = 50 bars × 8m = 400m
3Total length: 400m + 400m = 800m
4Add laps and wastage: 800m × 1.15 = 920m
5Weight: 920m × 0.888 kg/m = 817 kg
Result: 817 kg of 12mm steel bars needed