Structural reinforcement requires precise material specifications. Our Rebar Size Converter translates standard ASTM rebar numbers into their physical diameter, cross-sectional area, and weight per unit length. Whether you're working with Imperial #3-#18 or Metric 10M-55M bars, our tool provides the engineering data needed for load-bearing calculations and site logistics.
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Standard Rebar Size Calculator
Convert rebar size numbers to diameter, area, and weight per unit length (Imperial and Metric). Fast, free, and 100% private. All processing happens locally.
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1
Select Number
Choose your rebar size (e.g., #4, #5).
2
Check Specs
View diameter in inches/mm and weight in lb/ft or kg/m.
3
Save Your Output
Click the download or copy button to export your results to your device or clipboard.
Key Features
ASTM & Metric Standards
Full support for US standard rebar numbers and Canadian/European metric sizes.
Weight Estimator
Calculates weight in lb/ft and kg/m to help with transportation and structural planning.
Area Calculations
Provides cross-sectional area (sq in, sq mm) for concrete reinforcement planning.
Frequently Asked Questions
It is 1/2 inch in diameter (4/8 of an inch). The number represents eighths of an inch.
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