Rebar Weight and Size Calculator
Calculate rebar weight, length requirements, and sizing for construction projects. Determine rebar quantities and costs for concrete reinforcement.
Step 1: Rebar Specifications
Understanding Rebar Sizes
Rebar sizes are designated by numbers that correspond to their diameter in eighths of an inch. #4 rebar means 4/8″ or 1/2″ diameter. Larger numbers indicate thicker, stronger bars.
Step 2: Calculation Options
Rebar Weight Calculation
Rebar weight is calculated based on diameter, length, and steel density (typically 0.2836 lbs/in³ for carbon steel). The formula: Weight = (Diameter²/162) × Length (in feet).
Rebar Calculation Results
Total Rebar Weight
Rebar Size Comparison Table
| Rebar Size | Diameter (in) | Weight per ft (lbs) | Area (in²) | Typical Use |
|---|
Rebar Calculation Formulas
Weight Formula (Imperial)
Weight (lbs) = (Diameter in inches)² × Length in feet × 0.668
Where 0.668 is the constant for steel density (490 lbs/ft³)
Weight Formula (Metric)
Weight (kg) = (Diameter in mm)² × Length in meters × 0.006165
Where 0.006165 is the constant for steel density (7850 kg/m³)
Area Formula
Cross-sectional Area (in²) = π × (Diameter/2)²
or approximately: Area (in²) = (Diameter in inches)² × 0.7854
Standard Rebar Specifications
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