Quikrete Concrete Bag Calculator
How to Calculate Quikrete Bags for Your Project
Estimating the amount of Quikrete needed for a patio, walkway, or footing is essential to avoid multiple trips to the hardware store. This calculator uses the standard yield rates for Quikrete High Early Strength and Standard Concrete Mixes.
Understanding Yields
A standard 80 lb bag of Quikrete concrete mix yields approximately 0.6 cubic feet of wet concrete. To determine your total needs, you must first find the volume of your project in cubic feet.
| Bag Weight | Yield (Cubic Feet) | Bags per Cubic Yard |
|---|---|---|
| 80 lb Bag | 0.6 cu. ft. | 45 Bags |
| 60 lb Bag | 0.45 cu. ft. | 60 Bags |
| 40 lb Bag | 0.3 cu. ft. | 90 Bags |
Formula Used
The calculation for concrete volume is: Length (ft) × Width (ft) × Thickness (ft) = Total Cubic Feet.
Since most slabs are measured in inches for thickness, we divide the thickness by 12. For example, a 4-inch slab is 0.33 feet thick. Our calculator automatically handles the conversion of inches and feet to give you a precise bag count.
Project Example
If you are pouring a small trash can pad that is 4 feet long, 4 feet wide, and 4 inches thick:
- Volume: 4′ x 4′ x 0.33′ = 5.33 Cubic Feet
- 80lb Bags: 5.33 / 0.6 = 8.88 (9 Bags)
- 60lb Bags: 5.33 / 0.45 = 11.84 (12 Bags)
Tips for a Successful Pour
Always ensure your subbase is well-compacted before pouring. If your ground is soft, the concrete may settle, causing cracks. For slabs thicker than 4 inches or those supporting heavy loads (like vehicles), consider adding rebar or wire mesh for structural integrity. When mixing Quikrete, add water slowly—too much water weakens the final strength of the concrete.