Quikrete Concrete Calculator
Calculate Quikrete high-early strength, 5000 Plus, and standard concrete bag volumes and water hydration ratios.
Volume: 36.67 cu ft (1.36 cu yds)
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What Is a Quikrete Concrete Calculator?
A specialized Quikrete concrete calculator engineered for estimating standard 4,000 PSI concrete mix and Quikrete 5000 commercial-grade mixes. It computes precise bag yields, volume coverage, and batch mixing water.
How to Use This Calculator
- Input length, width, and thickness of your project in feet and inches.
- View the exact breakdown for 80-lb, 60-lb, and 50-lb Quikrete bags.
- Check total clean water mixing volume in gallons.
- Review compressive strength ratings and curing times.
Quikrete Bag Yield Equation
\text{Bags} = \left\lceil \frac{\text{Cu Ft Volume} \times 1.10}{0.60} \right\rceil \quad (\text{for 80-lb bags})Each 80-lb bag yields 0.60 cubic feet (45 bags per cubic yard). 60-lb bags yield 0.45 cubic feet (60 bags per cubic yard).
Worked Example
Scenario: Pouring an 8 ft by 8 ft shed footing pad, 4 inches thick.
Volume: 8 × 8 × 0.333 ft = 21.33 cu ft.
With 10% contingency: 21.33 × 1.10 = 23.47 cu ft.
80-lb bag requirement: 23.47 ÷ 0.60 = 39.1 -> 40 bags.
Water needed: ~30 gallons of clean water.
Tips & Key Notes
- Rent a small portable drum mixer from a local tool rental center if mixing more than 15 bags to ensure thorough blending.
- Add roughly 90% of the water to the mixer drum before adding dry concrete powder to prevent dry clumping at the back of the barrel.
- Protect fresh pours from direct sun and wind using curing blankets or plastic sheeting.
Frequently Asked Questions
How many 80 lb bags of Quikrete make 1 yard of concrete?
It takes 45 bags of 80-lb Quikrete to equal 1 cubic yard (27 cubic feet).
How long does Quikrete take to cure?
Standard Quikrete sets in 24 to 48 hours for foot traffic and reaches its specified 4,000 PSI design compressive strength in 28 days.
Can you mix Quikrete with too much water?
Yes. Excess water is the primary cause of weak concrete, surface dustiness, and shrinkage cracks. Maintain a firm, moldable consistency.
How much does an 80 lb bag of Quikrete cost?
An 80-lb bag of Quikrete typically retails for between $5.50 and $7.50 at home improvement centers (Home Depot, Lowe's).
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