How much concrete for a 10 × 10 slab?
A 10 × 10 ft slab (100 sq ft) poured 4 inches thick takes 1.23 cubic yards of concrete. With 10% extra for uneven ground and spillage, order 1.36 cubic yards of ready-mix or buy 62 bags of 80 lb mix.
| Thickness | Exact volume | Order (+10%) | 80 lb bags | 60 lb bags | Typical use |
|---|---|---|---|---|---|
| 4 in | 1.23 yd³ | 1.36 yd³ (1.04 m³) | 62 | 82 | Patio, walkway, shed floor |
| 5 in | 1.54 yd³ | 1.7 yd³ (1.3 m³) | 77 | 102 | Hot tub pad, light driveway |
| 6 in | 1.85 yd³ | 2.04 yd³ (1.56 m³) | 92 | 123 | Driveway, garage floor |
Bag counts include the 10% extra and assume 0.60 ft³ per 80 lb bag and 0.45 ft³ per 60 lb bag.
Change the size, thickness or price
36.7 cubic feet = 1.36 cubic yards = 1.04 m³. Above about 1 cubic yard, ready-mix delivery is usually cheaper and faster than bags.
Rough material cost (cheapest option)
$231Ready-mix often has a short-load fee under 4–5 yd³. Rough 2026 US prices, edit to match local quotes.
FAQ
How many bags of concrete for a 10x10 slab?
At 4 inches thick, 62 bags of 80 lb concrete mix or 82 bags of 60 lb mix, including 10% extra. At 6 inches, 92 bags of 80 lb mix.
Should I use bags or ready-mix for a 10x10 slab?
Ready-mix is usually cheaper and much less work above about 1 cubic yard, and this slab needs 1.36. Under 4–5 yards many suppliers add a short-load fee, so compare a quote with 62 bags.
How do you calculate concrete for a 10 by 10 slab?
Multiply length × width × thickness in feet: 10 × 10 × (4 ÷ 12) = 33.3 cubic feet. Divide by 27 to get 1.23 cubic yards, then add 5–10% extra.