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How Much Concrete for a 10 × 10 Slab?

A 10 × 10 ft slab is 100 sq ft. It needs 1.36 cubic yards of concrete at 4 inches thick or 2.04 yd³ at 6 inches, including 10% extra.

10 × 10 ft slab, 10% extra included
Order4 in thick6 in thick
Cubic yards1.362.04
80-lb bags6292
60-lb bags82123
50-lb bags98147
40-lb bags123184
Cubic meters1.041.56
What are you pouring?
Units

Slab, patio or driveway

4 in is typical for patios and walks; 5–6 in for driveways and garage floors.

Bag size
Add your prices (optional)

Use your supplier's prices. We don't show average prices because they vary too much by area.

Concrete needed

1.36 cubic yards

36.7 ft³ · 1.04 m³ · includes 10% extra

You need about 1.36 cubic yards of concrete, or 62 bags of 80 lb mix.

Bags of premix

  • 12340 lb bags
  • 9850 lb bags
  • 8260 lb bags
  • 6280 lb bags
  • Before extra1.23 yd³ (33.3 ft³)
  • Weight of bags4,960 lb
  • Ready-mix costAdd a price per yd³
  • Bagged costAdd a price per bag

One 80 lb bag makes about 0.60 ft³ (manufacturer's published yield). Bags are rounded up.

At 1.36 yd³ (62 × 80 lb bags, 4,960 lb), bags and a small ready-mix load are both reasonable. Ask local suppliers for their minimum load and short-load fee before deciding.

Estimate only, not a quote or engineering advice. Disclaimer

A 10 × 10 ft slab is the classic small patio, shed base or hot tub pad. At 4 inches it is right at the size where people start weighing bags against a small ready-mix load.

10 × 10 slab at other thicknesses

Concrete for a 10 × 10 ft slab
Thicknessyd³ exactyd³ +10%80-lb bags60-lb bags
3.5 in1.081.195472
4 in1.231.366282
5 in1.541.7077102
6 in1.852.0492123
8 in2.472.72123163

How it's worked out

10 × 10 = 100 sq ft · 100 × 4 ÷ 12 = 33.3 ft³ · ÷ 27 = 1.23 yd³ · × 1.10 = 1.36 yd³

For bags, the 36.7 ft³ (with extra) is divided by each bag's yield: 0.60 ft³ for 80 lb, 0.45 for 60 lb, 0.375 for 50 lb and 0.30 for 40 lb, then rounded up. At 4 inches the slab itself weighs about 4,700 lb, using the 140 lb/ft³ unit weight QUIKRETE lists for its Concrete Mix.

Bags or a truck?

At 1.36 yd³ (62 × 80-lb bags, about 4,960 lb), this is the gray zone. Mixing it yourself with a rented mixer works; so does a small ready-mix load or a trailer-mix supplier. Get a price for a short load before deciding.

Don't forget the base: most slabs sit on a compacted layer of gravel, and thicker edges or footings around the perimeter add concrete. Use the footing calculator for a thickened edge.

Frequently asked questions

How many yards of concrete for a 10x10 slab?

1.23 cubic yards at 4 inches thick and 1.85 yd³ at 6 inches, before waste. With 10% extra, order 1.36 or 2.04 yd³.

How many bags of concrete for a 10x10 slab?

At 4 inches with 10% extra: 62 bags of 80-lb mix, 82 of 60 lb, 98 of 50 lb or 123 of 40 lb. At 6 inches: 92 bags of 80 lb or 123 of 60 lb.

How many cubic feet of concrete for a 10x10 slab?

33.3 ft³ at 4 inches (100 sq ft × 4 ÷ 12) and 50.0 ft³ at 6 inches, before waste.

How thick should a 10x10 slab be?

Four inches is usual for patios, walkways and shed pads. Garage floors, driveways and pads for heavy loads are commonly 5 to 6 inches. Follow local code or your plans for anything structural.

Other slab sizes

Related

Sources