Rebar Calculator
Calculate rebar weight and quantity for concrete
Rebar Calculator
Note:
Calculations based on #4 rebar (ÂŊ" diameter, 0.668 lbs/ft). Standard rebar comes in 20-foot lengths.
Rebar Needed
Total Linear Feet
560.0 ft
20 ft Pieces
28
Weight (lbs)
374.1
Lengthwise Bars
14
280.0 ft total
Widthwise Bars
14
280.0 ft total
Calculation Breakdown:
âĸ Slab dimensions: 20 ft à 20 ft
âĸ Grid spacing: 18 inches (1.50 ft)
âĸ Lengthwise bars: 13 + 1 = 14 bars
âĸ Widthwise bars: 13 + 1 = 14 bars
âĸ Lengthwise feet: 14 Ã 20 = 280.0 ft
âĸ Widthwise feet: 14 Ã 20 = 280.0 ft
âĸ Total: 280.0 + 280.0 = 560.0 ft
âĸ Weight: 560.0 ft à 0.668 lbs/ft = 374.1 lbs
đĄ Pro Tip:
Position rebar in the center of the slab thickness for optimal strength. Use rebar chairs or dobies to support it at the correct height. Overlap bars by at least 12 inches where pieces meet. Always tie intersections with rebar wire. For structural applications, consult an engineer.
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