Quikrete Concrete Calculator: Bags per Yard, Post and Slab
One 80 lb bag of Quikrete Concrete Mix makes 0.6 cubic feet, so a cubic yard takes 45 bags; a 10×10 ft slab at 4 in takes 62 bags with 10% extra.
Advanced options: waste, prices
NRMCA advises ordering 4 to 10 percent over the estimate.
Concrete needed (with 10% extra)
1.96 yd³
1.50 m³ · 48 ft³ before extra
Slab: 12 ft × 12 ft × 4 in. Over about 1 yd³: order ready-mix.
Premix bags
- 80 lb88
- 60 lb118
- 50 lb141
- 40 lb176
- Ready-mix cost
- $313
- Weight
- 7,200 lb
Full breakdown
| Volume before extra | 1.78 yd³ · 1.36 m³ |
|---|---|
| With 10% extra | 1.96 yd³ |
| Weight (150 lb/ft³) | 7,200 lb · 3.60 tons |
| Pallets of 40 lb (80 bags each) | 3 |
| Pallets of 60 lb (56 bags each) | 3 |
| Pallets of 80 lb (42 bags each) | 3 |
| Truckloads at 12 yd³ | 1 |
| Truckloads at 8 yd³ | 1 |
Bag counts round up, as Quikrete's own calculator does. Cost uses your prices; delivery and short-load fees are extra.
Key takeaways
- 80 lb Quikrete = 0.6 ft³; 45 bags per yard.
- Quikrete Concrete Mix (1101) is rated 4,000 psi.
- Pallet: 42 × 80 lb, 56 × 60 lb, 80 × 40 lb.
- Fast-Setting (1004): 50 lb bags, 56 per pallet.
How Many Bags of Quikrete Do I Need?
You need the concrete volume plus 10% extra, divided by the bag yield: 0.6 ft³ for an 80 lb bag of Quikrete. A 10×10 ft slab at 4 in needs 62 bags of 80 lb Quikrete; a 4×4 post in a 12 in hole 2 ft deep needs 3.
Concrete Calculator Yards is not affiliated with Quikrete; product facts come from quikrete.com.
Quikrete Bag Yields: 40, 50, 60 and 80 lb
Quikrete bag yields, from Quikrete's own calculator, are listed below.
| Bag | Yield (ft³) | Bags per yd³ |
|---|---|---|
| 80 lb | 0.6 | 45 |
| 60 lb | 0.45 | 60 |
| 50 lb | 0.375 | 72 |
| 40 lb | 0.3 | 90 |
How Many Bags of Quikrete per Yard?
A cubic yard takes 45 bags of 80 lb Quikrete or 60 bags of 60 lb, before extra; with 10% extra, that is 50 and 66.
How Many Square Feet Does a Bag of Quikrete Cover?
One 80 lb bag of Quikrete covers 1.8 sq ft at 4 in thick, 2.4 sq ft at 3 in and 3.6 sq ft at 2 in.
| Bag | 2 in | 3 in | 4 in |
|---|---|---|---|
| 80 lb | 3.60 sq ft | 2.40 sq ft | 1.80 sq ft |
| 60 lb | 2.70 sq ft | 1.80 sq ft | 1.35 sq ft |
| 40 lb | 1.80 sq ft | 1.20 sq ft | 0.90 sq ft |
Quikrete Bags per Fence Post and Sonotube
| Project | 80 lb bags | 60 lb bags |
|---|---|---|
| 4×4 post, 12 in hole, 2 ft | 3 | 4 |
| 6×6 post, 18 in hole, 3 ft | 9 | 12 |
| 8 in sonotube, 4 ft | 3 | 4 |
| 12 in sonotube, 4 ft | 6 | 8 |
60 lb vs 80 lb Quikrete Bags: What Is the Difference?
The only difference is the amount: an 80 lb bag of Quikrete makes 0.6 ft³ and a 60 lb bag makes 0.45 ft³ of the same mix, so you need 4 bags of 60 lb for every 3 bags of 80 lb.
Which Quikrete Mix for Which Project?
Quikrete makes several concrete mixes; this calculator uses the yields of the standard Concrete Mix.
- Concrete Mix (No. 1101): 4,000 psi average compressive strength; slabs, footings, steps and posts.
- Fast-Setting Concrete Mix (No. 1004): sold in 50 lb bags, 56 per pallet; used for setting posts without mixing.
How Many Bags of Quikrete on a Pallet?
A pallet of Quikrete Concrete Mix holds 42 bags of 80 lb, 56 bags of 60 lb or 80 bags of 40 lb, according to Quikrete; store counts can vary.
Worked Examples With Quikrete
10×10 ft slab at 4 in. 33.33 ft³ × 1.1 ÷ 0.6 = 62 bags of 80 lb Quikrete, or 82 of 60 lb.
4×4 fence post, 12 in hole, 2 ft deep. 1.40 ft³ × 1.1 ÷ 0.6 = 3 bags of 80 lb Concrete Mix.
12 in QUIK-TUBE-style form, 4 ft deep. 3.14 ft³ × 1.1 ÷ 0.6 = 6 bags of 80 lb.
How to Calculate How Much Quikrete You Need
- Find the volume in cubic feet with the calculator.
- Add 10% for waste.
- Divide by 0.6 (80 lb) or 0.45 (60 lb).
- Round up to whole bags.
Quikrete Concrete Calculator FAQ
How many square feet does an 80 lb bag of Quikrete cover?
An 80 lb bag of Quikrete covers 1.8 sq ft at 4 in thick, 2.4 sq ft at 3 in and 3.6 sq ft at 2 in.
How many cubic feet does a 50 lb bag of Quikrete make?
A 50 lb bag of Quikrete makes 0.375 ft³, according to Quikrete's calculator.
Next step
Compare brands on Quikrete vs Sakrete, or set posts with the fence post concrete calculator.
Official sources
Last reviewed 2026-11-05. Numbers come from our tested engine; see how we calculate and our sources.