What size rebar for driveway?
#3 (3/8") or #4 (1/2") rebar is commonly used for residential driveways.
Calculator
Enter your values
Results
Total Weight
147.0 lbs
Total Length
220.0 ft
Reinforcement Analysis
Grid details
Grid Layout
You need a grid of 11 x 11 bars. This creates 10 x 10 squares.
Ordering
Rebar typically comes in 20ft lengths. You will need approx 11 sticks of 20ft rebar. Don't forget to account for overlap (usually 18-24") if splicing is needed.
Support
Use rebar chairs to keep the grid elevated in the center of the slab thickness. Place chairs every 3-4 feet.
How to Use
Step-by-step instructions
- 1Enter the length and width of the concrete slab (in feet).
- 2Enter the rebar spacing (in inches).
- 3Select the rebar size (#3, #4, etc.).
- 4The calculator will estimate the total length and weight.
Grid Estimation
Calculates the total footage of rebar needed for a grid pattern.
Total Length = (Rows x Width) + (Cols x Length)Variables:
RowsNumber of bars running lengthwiseColsNumber of bars running widthwiseExample
10x10 Slab
Inputs:
Size:10 ft x 10 ft
Spacing:12 inches
Size:#4
Steps:
- 1.Rows = (120 / 12) + 1 = 11
- 2.Cols = (120 / 12) + 1 = 11
- 3.Total Length = (11 * 10) + (11 * 10) = 220 ft
- 4.Weight (#4) = 220 * 0.668 = 146.96 lbs
Result:
220 ft (147 lbs)