Rebar Calculator
Estimate the total length and weight of rebar required for a concrete grid reinforcement.
Typically 12, 16, 18, or 24 inch centers
Gap from edge of slab (Cover)
Rebar Needed
Total Bars
30
20 ft bars (#4)
Total Weight
400 lbs
- Total Linear Feet: 600 ft
- Rebar Grid: 14 x 14 bars
Calculating Rebar Grid
To reinforce a concrete slab, rebar is placed in a grid pattern. The "on center" spacing determines how close the bars are.
Common Rebar Sizes
- #3: 3/8 inch (0.376 lbs/ft) - Patios, driveways.
- #4: 1/2 inch (0.668 lbs/ft) - Walls, footings, heavy slabs.
- #5: 5/8 inch (1.043 lbs/ft) - Heavy structural work.