Concrete Slab Volume, Bags & Rebar Calculator

Plan pours like a pro: compute slab, thickened edges, and interior beams; convert volume to ready‑mix or 60/80‑lb bags; auto‑size joints and rebar; preview the layout; tune costs; then export clean CSV/PDF and share a permalink—everything in one fast, builder‑grade tool. Supports metric/imperial units, slope, openings, presets, chairs, tie wire, and JSON‑LD SEO too.

Not a substitute for a stamped structural design. Verify with local codes, soil conditions, and an engineer when required.
ft / in
Footprint & Thickness
ft
ft
in
Additional Rectangles & Openings
Add rectangles (L‑shapes, pads)LengthWidth
Openings (exclude volume)LengthWidth
Edges, Beams & Joints
in
in
in
in
× thickness
Sawcut depth ≈ 25% of thickness
yd³
Reinforcement
Subbase & Forms (optional)
in
0 = none
lb/ft³
Gravel ≈ 95–110 lb/ft³
Stake @ 2.5′ o.c., 8′ boards
Unit Costs (optional)
$
$
$
$
$
$
$
$
$
$
$
Total Concrete
0.00
yd³ (0.00 m³)
Weight (fresh)
0
lb
Bags (60 lb)
0
60‑lb (80‑lb: 0)
Truck Loads
0
at 9 yd³
Visualizer
Slab area    Thickened edge    Beams    Joints
Charts
ItemSpecQtyUnit
Rebar Cut ItemSizeLength (ft)CountWeight (lb)
CategoryQtyUnitUnit CostTotal
Grand Total$0.00
 
    
        
    
      
    
    
    
  
    

    








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    Important Note:  All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.