Rebar Weight Calculator
Calculate the weight, quantity, and cost of rebar for your construction project based on standard sizes.
Enter rebar details and click calculate to see results.
How It Works
How This Calculator Works
This calculator determines the weight of rebar based on standard sizes and lengths. Each rebar size has a specific weight per unit length. The calculator converts all units to a standard measure before calculating and includes options for calculating total weight and costs.
The Formula
Weight calculation:
Weight = Length × Quantity × Weight per unit length
Cost calculation:
Cost = Weight × Price per unit weight
Standard Rebar Sizes
| Size | Diameter | Weight (lb/ft) | Weight (kg/m) |
|---|---|---|---|
| #2 | ¼" (6.4mm) | 0.167 | 0.249 |
| #3 | ⅜" (9.5mm) | 0.376 | 0.560 |
| #4 | ½" (12.7mm) | 0.668 | 0.994 |
| #5 | ⅝" (15.9mm) | 1.043 | 1.552 |
| #6 | ¾" (19.1mm) | 1.502 | 2.235 |
| #7 | ⅞" (22.2mm) | 2.044 | 3.042 |
| #8 | 1" (25.4mm) | 2.670 | 3.973 |
Important Considerations
- Always check with local building codes for required rebar spacing and size
- For structural applications, consult with a professional engineer
- Price varies considerably by region, supplier, and market conditions
- Consider adding 5-10% extra material for overlaps, cuts, and waste
Frequently Asked Questions
How do I choose the right rebar size?
Rebar size selection depends on the specific structural requirements of your project. Generally, #3 and #4 rebar are common for residential applications like driveways and patios, while larger sizes (#5 and up) are used for foundations, columns, and other load-bearing structures. Always consult local building codes or a structural engineer.
What is the difference between Grade 40 and Grade 60 rebar?
The grade refers to the tensile strength of the rebar. Grade 40 has a minimum yield strength of 40,000 psi, while Grade 60 has a minimum yield strength of 60,000 psi. Grade 60 is more common for modern construction and is required by most building codes for structural applications.
How far apart should rebar be placed?
Typical spacing ranges from 12 to 18 inches (30 to 45 cm) on center in both directions for slabs, but this can vary based on the specific application and local building codes. Foundations and other structural elements may require different spacing.
Should I use rebar or wire mesh for my concrete project?
Rebar is ideal for structural concrete that needs to resist heavy loads or tensile forces. Wire mesh (also called welded wire fabric) is often used for thinner slabs like patios, sidewalks, and driveways. For critical applications, rebar provides better strength and is preferred for foundations, beams, and columns.