How much concrete for a 14 × 14 slab?
A 14 × 14 ft slab (196 sq ft) poured 4 inches thick takes 2.42 cubic yards of concrete. With 10% extra for uneven ground and spillage, order 2.66 cubic yards of ready-mix or buy 120 bags of 80 lb mix.
| Thickness | Exact volume | Order (+10%) | 80 lb bags | 60 lb bags | Typical use |
|---|---|---|---|---|---|
| 4 in | 2.42 yd³ | 2.66 yd³ (2.04 m³) | 120 | 160 | Patio, walkway, shed floor |
| 5 in | 3.02 yd³ | 3.33 yd³ (2.54 m³) | 150 | 200 | Hot tub pad, light driveway |
| 6 in | 3.63 yd³ | 3.99 yd³ (3.05 m³) | 180 | 240 | 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
71.9 cubic feet = 2.66 cubic yards = 2.04 m³. Above about 1 cubic yard, ready-mix delivery is usually cheaper and faster than bags.
Rough material cost (cheapest option)
$452Ready-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 14x14 slab?
At 4 inches thick, 120 bags of 80 lb concrete mix or 160 bags of 60 lb mix, including 10% extra. At 6 inches, 180 bags of 80 lb mix.
Should I use bags or ready-mix for a 14x14 slab?
Ready-mix is usually cheaper and much less work above about 1 cubic yard, and this slab needs 2.66. Under 4–5 yards many suppliers add a short-load fee, so compare a quote with 120 bags.
How do you calculate concrete for a 14 by 14 slab?
Multiply length × width × thickness in feet: 14 × 14 × (4 ÷ 12) = 65.3 cubic feet. Divide by 27 to get 2.42 cubic yards, then add 5–10% extra.