Enter slab dimensions, pick rebar or wire mesh, set spacing and lap sticks, weight, and tie counts update live.
Extra steel for bar joints.
Distance from form edge.
Labor (optional)
20-ft rebar sticks
28
STICKS
Bill of materials+15% waste
#4 rebar (20-ft sticks)
552 ft with laps · 12×20 grid
Net 480 ft · Waste +15% lap
Steel weight
0.184 tons @ 0.668 lb/ft
Net — · Waste —
Wire ties
1,000-ct bags · 1 tie per intersection
Net 240 ties · Waste —
Cost projection
Saved on this device · No account · No cloud
Total · $378.00
28 sticks
Bar runs = floor((span − 2 × cover) ÷ spacing) + 1 per direction; total footage includes the lap-splice allowance for bar joints.
Enter slab dimensions, pick rebar or wire mesh, set spacing and lap sticks, weight, and tie counts update live.
Weight uses standard bar weights (#3 = 0.376, #4 = 0.668, #5 = 1.043 lb/ft) so you can price by the ton.
Tie count = one tie per grid intersection budget a 1,000-count bag per ~1,000 intersections.
Bars = span ÷ spacing + 1
Bars per direction = floor((span − 2 × cover) ÷ spacing) + 1. The tool totals linear feet in both directions, including the lap-splice allowance for bar joints.
12 inches on center each way is the common residential default; 18 to 24 inches suits light-duty work. Keep 3 inches of clear cover from form edges.
#4 (1/2-inch) bar weighs 0.668 lb per foot, so 500 linear feet is about 334 lbs. (#3 = 0.376, #5 = 1.043 lb/ft.) Use the weight total to price steel by the ton.
Divide total linear feet — including your lap-splice allowance, typically 15% — by 20 and round up.
Budget one tie per grid intersection — roughly a 1,000-count bag per 1,000 intersections.
Keep estimating
More concrete calculators for this job.