Rebar Calculator

Primary output 23 stock bars

Start with slab length, width, spacing, and bar size. Open advanced options for edge clearance, stock length, waste allowance, lap-splice factor, and wall / footing details.

Calculation mode
More options
Waste allowance Quantity takeoff only; engineered drawings control structural spacing and cover. Lap splice 20 in
Answer
23 stock bars
Lengthwise bars 11 bars
Widthwise bars 21 bars
Total rebar length 455.4 ft
Stock bars to buy 23 pieces
Approximate weight 304.21 lb
Lap-splice length 20 in
Show calculation details
Effective grid length 19.5 ft
Effective grid width 9.5 ft
Unit weight 0.668 lb/ft
Notes Quantity takeoff only; engineered drawings control structural spacing and cover.