How Much Concrete for a 10x10 Slab? Yards and Bags
How much concrete for a 10x10 slab? At 4 inches thick, a 10 by 10 foot slab is 33.3 cubic feet, or about 1.23 cubic yards. That is roughly 56 bags of 80-pound mix before any extra. Most people add 5 to 10 percent for uneven ground and spillage, which brings it to about 1.3 to 1.36 cubic yards, or around 59 to 62 bags.
Concrete calculator →The math
- Area: 10 × 10 = 100 square feet.
- Volume: 100 × (4 ÷ 12) = 33.3 cubic feet.
- Cubic yards: 33.3 ÷ 27 = 1.23 cubic yards.
- Bags: 33.3 ÷ 0.60 = 55.6, so 56 bags of 80-pound mix, using Quikrete's published yield of about 0.60 cubic feet per 80-pound bag (Quikrete data sheet).
10x10 slab at different thicknesses
| Thickness | Cubic feet | Cubic yards | 80 lb bags | 60 lb bags | Yards with 10% extra |
|---|---|---|---|---|---|
| 4 in | 33.3 | 1.23 | 56 (62 with 10%) | 75 (82 with 10%) | ~1.36 |
| 5 in | 41.7 | 1.54 | 70 (77 with 10%) | 93 (102 with 10%) | ~1.70 |
| 6 in | 50.0 | 1.85 | 84 (92 with 10%) | 112 (123 with 10%) | ~2.04 |
60-pound bag counts use Quikrete's 0.45 cubic foot yield. Other brands are close but not identical; check the bag.
How thick should a 10x10 slab be?
Patios, walkways and small shed pads are commonly poured about 4 inches thick. Slabs for heavier loads, such as a hot tub, a garage-style shed or vehicles, are often thicker or have thickened edges, and some need reinforcement and a specific base. Follow the equipment maker's instructions and local code.
Bags or ready-mix?
Sixty-some 80-pound bags is close to 5,000 pounds of dry mix to lift, mix and place, usually more than one person can finish before the first batches start to set. Many people with a 10x10 slab order ready-mix instead, or rent a mixer and line up helpers. Ready-mix suppliers often have minimum loads and charge extra for small orders, so call for a quote on about 1.25 to 1.5 yards. Our bags per yard guide shows when bags stop making sense.
Don't forget the base
A slab usually sits on a few inches of compacted gravel. For a 10x10 pad at 4 inches, that is about 1.2 cubic yards, or about 1.7 tons of stone at 1.4 tons per yard. The base calculator handles it, and gravel shed foundation covers prep.
Quick checks before you order
- Measure inside the forms, not the outside of the boards.
- Check the depth in several spots; low ground means more concrete.
- Plan control joints. For a 10x10, one joint each way at the middle is common.
Try other sizes with the concrete calculator; it opens on a 10x10 slab by default.
Questions people ask
How many bags of concrete for a 10x10 slab 4 inches thick?
About 56 bags of 80-pound mix or 75 bags of 60-pound mix before extra, based on Quikrete yields. With 10 percent extra, about 62 or 82 bags.
How many yards of concrete for a 10x10 slab?
About 1.23 cubic yards at 4 inches thick, 1.54 at 5 inches and 1.85 at 6 inches, before extra for waste.
Is it cheaper to use bags or ready-mix for a 10x10 slab?
It depends on local bag prices and the supplier's short-load charges. Get a ready-mix quote for about 1.25 to 1.5 yards and compare it with the bag total.
How thick should a 10x10 patio slab be?
Patios are commonly poured about 4 inches thick. Heavier loads like hot tubs or vehicles often call for thicker slabs or reinforcement.
Related guides
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