Concrete Bag Calculator
Calculate exactly how many bags of concrete you need. Works for Quikrete, Sakrete and all brands. Choose 40lb, 60lb or 80lb bags. Instant results — no signup.
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How Many Bags of Concrete Do I Need?
To determine exactly how many bags of concrete you need for your project, you first need to calculate the total volume in cubic feet. You can do this by multiplying the length, width, and depth in feet. Once you have your total cubic footage, you simply divide that number by the yield (coverage) of the concrete bag you plan to buy. Our concrete bag calculator automates this math for you.
For reference, here are the standard bag yields across all major brands: a 40lb bag covers 0.30 ft³, a 60lb bag covers 0.45 ft³, an 80lb bag covers 0.60 ft³, and a 90lb bag covers 0.75 ft³.
Bags Per Cubic Yard — Reference Table
| Bag Size | Coverage | Bags Per Cubic Yard |
|---|---|---|
| 40 lb | 0.30 ft³ | 90 bags |
| 60 lb | 0.45 ft³ | 60 bags |
| 80 lb | 0.60 ft³ | 45 bags |
| 90 lb | 0.75 ft³ | 40 bags |
Quikrete vs Sakrete — Does It Matter?
Both Quikrete and Sakrete are industry-standard, high-quality pre-mixed concrete options trusted by contractors and DIYers alike. Quikrete 80lb is the most common retail choice in the US, but Sakrete offers an entirely equivalent product in both strength and coverage yield.
The brand name does NOT affect your bag count calculation in any way. Whether you are using a Quikrete calculator or a Sakrete calculator, all standard 80lb bags will yield approximately 0.60 ft³ regardless of the brand stamped on the paper. Buy whatever is readily available at your local hardware store.
Frequently Asked Questions
How many bags of concrete do I need per cubic yard?
One cubic yard requires 45 bags of 80lb concrete, 60 bags of 60lb, or 90 bags of 40lb concrete mix.
How much does a bag of concrete cover?
An 80lb bag covers 0.60 cubic feet. A 60lb bag covers 0.45 cubic feet. A 40lb bag covers 0.30 cubic feet.
How many bags of Quikrete do I need for a 10x10 slab?
A 10×10 ft slab at 4 inches thick (33.3 ft³ + 10% waste = 36.6 ft³) requires approximately 62 bags of 80lb Quikrete.
Is it cheaper to buy bags or ready-mix?
For volumes under 0.5 cubic yards, bags are more practical. Above 1 cubic yard, ready-mix concrete delivery is almost always cheaper per yard than buying individual bags.