Rebar Calculator
Calculate reinforcement steel requirements, grid dimensions, and total cost for concrete slabs
Calculate Rebar Requirements
Slab Dimensions
Spacing Configuration
Distance between parallel rebar lines
Distance from slab edge to first rebar line
Supplier Information
Standard length of rebar bars available
Rebar Calculation Results
Grid Configuration: 0 columns × 0 rows
Formulas used:
- • Grid length = slab length - (2 × edge spacing) = 0.00m - (2 × 0.00m) = 0.00m
- • Grid width = slab width - (2 × edge spacing) = 0.00m - (2 × 0.00m) = 0.00m
- • Total rebar length = (columns × grid width) + (rows × grid length) = (0 × 0.00m) + (0 × 0.00m) = 0.00m
- • Number of pieces = total length ÷ single rebar length = 0.00m ÷ 0.00m = 0 pieces
Analysis & Recommendations
Example Calculation
Concrete Driveway Example
Slab dimensions: 6m × 4m concrete driveway
Rebar spacing: 40cm between rebar lines
Edge spacing: 8cm from slab edge to grid
Single rebar length: 6m standard bars
Rebar price: $2.00 per meter
Calculation Results
Grid length = 6.0m - (2 × 0.08m) = 5.84m
Grid width = 4.0m - (2 × 0.08m) = 3.84m
Columns = floor(5.84 ÷ 0.4) + 1 = 15 columns
Rows = floor(3.84 ÷ 0.4) + 1 = 10 rows
Total length = (15 × 3.84m) + (10 × 5.84m) = 57.6m + 58.4m = 116m
Pieces needed = ceil(116m ÷ 6m) = 20 pieces
Total cost = 116m × $2.00/m = $232.00
Common Rebar Sizes
Rebar Tips
Standard spacing: 15-40cm for typical slabs
Maintain 5-10cm concrete cover from edges
Use tie wire (1.6mm) to connect intersections
Avoid welding rebar - reduces strength
Place rebar in lower third of slab thickness
Understanding Rebar and Concrete Reinforcement
What is Rebar?
Rebar (reinforcement steel) is a building material used to improve the tensile strength of concrete structures. Made of patterned steel for better adhesion, rebar compensates for concrete's low tensional strength and can boost resistance to failure by several times.
Why Use Rebar?
- •Increases tensile strength of concrete
- •Improves crack resistance
- •Allows for thinner concrete sections
- •Extends structural lifespan significantly
Calculation Formulas
Grid Length = Slab Length - (2 × Edge Spacing)
Grid Width = Slab Width - (2 × Edge Spacing)
Total Length = (Columns × Grid Width) + (Rows × Grid Length)
Pieces = ceil(Total Length ÷ Single Rebar Length)
Best Practices
- Spacing: 15-40cm for residential slabs
- Cover: Minimum 5cm concrete cover
- Connections: Use tie wire, avoid welding
- Placement: Lower third of slab thickness