3D Concrete Slab Cost, Cubic Yardage & Rebar Calculator
Compute exact ready-mix cubic yards, 9-yard transit mixer loads, wet tonnage, #3/#4 deformed rebar linear footage, 3D isometric slab cross-sections, and 2026 foundation cost per square foot.
How to Choose Between a 4-Inch, 5-Inch, and 6-Inch Concrete Slab
Adding one extra inch of concrete deck thickness increases ready-mix material volume by roughly 20% to 25%, while increasing flexural load capacity by more than 50%. Use the engineering matrix below before ordering ready-mix trucks.
4-Inch Slab (3,000 PSI, #3 Rebar @ 18" OC)
Designed for pickup trucks, UTVs, lawn equipment, and standard residential 2-car garages. Not recommended for 2-post asymmetric automotive lifts.
5-Inch Slab (3,500 PSI, #4 Rebar @ 12" OC)
The gold standard for 30x40, 30x50, and 40x60 workshops. Meets the 4.25-inch to 5-inch minimum concrete embedment depth required by BendPak, Rotary, and Challenger 10,000-lb to 12,000-lb 2-post auto lifts.
6-Inch Slab (4,000 PSI, #4 Rebar @ 12" OC)
Built for loaded Class-A diesel pushers, loaded tandem-axle gooseneck trailers, forklifts, and commercial weld-up red-iron buildings with high bay point loads.
Concrete Slab Cost, Yardage & Rebar Reference Table (24x30 to 60x100)
Compare ready-mix cubic yardage (including perimeter turndown beam and 8% waste), 9-yard truck counts, deformed rebar linear footage, raw batch-plant concrete cost, and installed monolithic slab price ranges.
| Slab Size | Area | Perimeter | Cubic Yards (4" / 5") | 9-Yd Trucks | Rebar Grid | Ready-Mix Material | Installed Monolithic Range | Spec Sheet |
|---|---|---|---|---|---|---|---|---|
| 24x30 Slab | 720 sq ft | 108 LF | 12 yds (15 yds @ 5") | 2 trucks | 1,392 LF | $1,980 | $5,210 - $10,980 | Open 24x30 Spec → |
| 30x40 Slab | 1,200 sq ft | 140 LF | 20 yds (25 yds @ 5") | 3 trucks | 2,160 LF | $3,300 | $8,690 - $18,300 | Open 30x40 Spec → |
| 30x50 Slab | 1,500 sq ft | 160 LF | 25 yds (31 yds @ 5") | 4 trucks | 3,640 LF | $5,208 | $10,860 - $22,875 | Open 30x50 Spec → |
| 40x60 Slab | 2,400 sq ft | 200 LF | 39 yds (48 yds @ 5") | 6 trucks | 5,600 LF | $8,064 | $17,375 - $36,600 | Open 40x60 Spec → |
| 50x80 Slab | 4,000 sq ft | 260 LF | 64 yds (79 yds @ 5") | 11 trucks | 9,040 LF | $16,720 | $28,960 - $61,000 | Open 50x80 Spec → |
| 60x100 Slab | 6,000 sq ft | 320 LF | 95 yds (117 yds @ 5") | 16 trucks | 13,280 LF | $24,288 | $43,440 - $91,500 | Open 60x100 Spec → |
Get a Turnkey Local Quote for Your Exact Slab & Building Spec
Lock in the cubic yardage, rebar schedule, and perimeter grade beam dimensions from the calculator above and request a site-specific quote from our vetted concrete foundation and metal building erection partner serving your county.
- Includes laser pad-site grading & compacted select fill evaluation
- Anchor-bolt layout matched to pre-engineered or weld-up steel frames
- Zero obligation - compare against your local batch-plant & contractor estimates