How Much Concrete Do I Need for a 10×10 Slab? Plus Common Slab Sizes
A complete material takeoff for a 10×10 foot concrete slab across 4", 5", and 6" depths, plus reference charts for 8×8, 10×12, 12×12, 16×20, 20×20, 24×24, and 30×40 slabs.
At 4" thick: 1.36 Cubic Yards or 62 Bags (80 lb).
The nominal volume is 1.23 cubic yards (33.33 cu. ft.). Factoring in a recommended 10% safety buffer (1.36 cu. yds / 36.67 cu. ft.), order 1.5 cubic yards of ready-mix or buy 62 bags (80 lb) / 82 bags (60 lb).
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How the 10×10 Slab Calculation Is Derived
A 10-foot by 10-foot slab covers exactly 100 square feet of ground area. Here is the auditable math across depths:
At 4 Inches (0.3333 Feet) Depth:
At 6 Inches (0.5000 Feet) Depth:
Master Takeoff Table for Common Slab Dimensions
This comprehensive reference chart consolidates the most common residential and commercial slab dimensions at both standard 4-inch (patio/shed) and 6-inch (driveway/garage) thicknesses:
| Slab Size | Area | 4" Volume (+10%) | 80 lb Bags @ 4" | 6" Volume (+10%) | 80 lb Bags @ 6" | Ready-Mix Order |
|---|---|---|---|---|---|---|
| 8 × 8 ft | 64 sq ft | 0.87 yd³ (23.5 ft³) | 40 bags | 1.30 yd³ (35.2 ft³) | 59 bags | Bagged / 1.5 yd³ |
| 10 × 10 ft | 100 sq ft | 1.36 yd³ (36.7 ft³) | 62 bags | 2.04 yd³ (55.0 ft³) | 92 bags | 1.5 / 2.0 yd³ |
| 10 × 12 ft | 120 sq ft | 1.63 yd³ (44.0 ft³) | 74 bags | 2.44 yd³ (66.0 ft³) | 110 bags | 2.0 / 2.5 yd³ |
| 12 × 12 ft | 144 sq ft | 1.96 yd³ (52.8 ft³) | 88 bags | 2.93 yd³ (79.2 ft³) | 132 bags | 2.0 / 3.0 yd³ |
| 12 × 16 ft | 192 sq ft | 2.61 yd³ (70.4 ft³) | 118 bags | 3.91 yd³ (105.6 ft³) | 176 bags | 3.0 / 4.0 yd³ |
| 16 × 20 ft | 320 sq ft | 4.35 yd³ (117.3 ft³) | 196 bags | 6.52 yd³ (176.0 ft³) | 294 bags | 4.5 / 7.0 yd³ |
| 20 × 20 ft | 400 sq ft | 5.43 yd³ (146.7 ft³) | 245 bags | 8.15 yd³ (220.0 ft³) | 367 bags | 5.5 / 8.5 yd³ |
| 24 × 24 ft | 576 sq ft | 7.82 yd³ (211.2 ft³) | 352 bags | 11.73 yd³ (316.8 ft³) | 528 bags | 8.0 / 12.0 yd³ |
| 30 × 40 ft | 1,200 sq ft | 16.30 yd³ (440.0 ft³) | 734 bags | 24.44 yd³ (660.0 ft³) | 1,100 bags | 16.5 / 24.5 yd³ |
* All bag and yardage totals include a 10% safety buffer. Bag counts assume standard 0.60 cu ft yield per 80 lb bag.
Complete Materials Takeoff for a 10×10 Concrete Slab
Building a durable 10×10 slab requires more than just cement. Here is the complete job-site materials bill:
- Concrete: 1.5 cubic yards ready-mix OR 62 bags of 80 lb concrete mix.
- Subbase Gravel: 4 inches of compacted #57 crushed limestone = ~1.35 tons (1.25 cu. yds.).
- Formwork: Four 10-foot 2×4 lumber boards (or 2×6 for a 5–6" pour) + 12 wood stakes.
- Reinforcement: One 10×10 welded wire mesh sheet (6×6 W1.4/W1.4) OR eight 10-foot #4 (1/2") rebar sticks spaced on an 18" grid, elevated on 20 plastic chairs.
- Vapor Barrier (If Enclosed): 120 sq. ft. of 10-mil polyethylene sheeting.
- Curing Compound / Sealer: 1 gallon of acrylic cure-and-seal compound.
For step-by-step thickness selection, review our guide on how thick should a concrete slab be.
Frequently Asked Questions About 10×10 & Common Slab Sizes
How much concrete do I need for a 10x10 slab at 4 inches thick?
A 10×10 foot slab at 4 inches thick has a nominal volume of 33.33 cubic feet (1.2346 cubic yards). With a recommended 10% safety buffer for uneven ground and form deflection, plan for 36.67 cubic feet (1.358 cubic yards), which requires 62 eighty-pound bags (or 82 sixty-pound bags). If ordering from a ready-mix batch plant, order 1.50 cubic yards.
How many bags of concrete do I need for a 10x10 slab?
At 4 inches thick with a 10% waste buffer, you need 62 bags of 80 lb concrete (or 82 bags of 60 lb concrete). At 6 inches thick (heavy pad), you need 92 bags of 80 lb concrete (or 123 bags of 60 lb concrete).
How much concrete do I need for a 12x12 slab?
A 12×12 foot slab (144 sq. ft.) at 4 inches thick requires 1.78 cubic yards nominal (48.0 cu. ft.). With a 10% safety allowance (52.8 cu. ft. / 1.96 cu. yds.), you need 88 bags of 80 lb concrete (or 118 bags of 60 lb concrete), or an order of 2.0 cubic yards of ready-mix.
How much concrete do I need for a 20x20 slab?
A 20×20 foot slab (400 sq. ft.) at 4 inches thick requires 4.94 cubic yards nominal (133.33 cu. ft.). With 10% waste (5.43 cu. yds.), you need 245 bags of 80 lb concrete—or an order of 5.5 cubic yards from a ready-mix supplier.
How many yards of concrete for a 30x40 slab?
A 30×40 foot slab (1,200 sq. ft.) poured at 4 inches thick requires 14.81 cubic yards nominal (16.30 cu. yds. with 10% waste -> order 16.5 yards). Poured at 6 inches thick (typical for heavy workshops), it requires 22.22 cubic yards nominal (24.44 cu. yds. with 10% waste -> order 24.5 to 25.0 cubic yards across 3 transit truckloads).