Cement Bag Calculator — Bags, Weight & Water Needed
Calculate how many bags of concrete you need for your project. Supports 40lb, 60lb, 80lb, and 94lb bags with standard, high-strength, and fast-set mix ratios.
4
Bag Sizes
3
Mix Ratios
2
Units
100%
Free to Use
Enter Concrete Volume
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Ready to Calculate
Enter your concrete volume and bag size to see estimates.
Bags Needed
0 bags
80 lb bags
Total Weight
0 lbs
Water Needed
0 gal
Yield per Bag
0 cu ft
Mix Ratio
Standard
Estimated Cost
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Coverage Details
Concrete Volume0 cu ft
Bag Size80 lb
Bags Required0
Total Weight0 lbs
Water Required0 gal
Total Cost—
Frequently Asked Questions
Divide the total concrete volume (in cubic feet) by the yield per bag. An 80 lb bag yields 0.60 cu ft, a 60 lb bag yields 0.45 cu ft, a 40 lb bag yields 0.30 cu ft, and a 94 lb portland cement bag yields 1.0 cu ft. Always round up and add 5–10% for waste.
For standard concrete mix, use approximately 1 gallon of water per 80 lb bag (0.5 quarts per pound). High-strength mixes require less water (about 0.8 gallons per 80 lb bag), and fast-set mixes require more (about 1.2 gallons per 80 lb bag). Follow manufacturer instructions.
80 lb bags are the most common for general projects and yield 0.60 cu ft. 60 lb bags are easier to handle and yield 0.45 cu ft. 40 lb bags are for small repairs and yield 0.30 cu ft. 94 lb bags are pure portland cement for mixing your own concrete with sand and gravel.
Standard mix is suitable for most projects like walkways and patios. High-strength mix is for structural applications like footings and foundations. Fast-set mix is for repairs and quick projects where you need concrete to cure rapidly. Each mix has different water requirements and compressive strength.
Concrete bag prices vary by brand, size, and mix type. Typically, 80 lb bags cost $5–$8, 60 lb bags cost $4–$7, 40 lb bags cost $3–$5, and 94 lb portland cement bags cost $10–$15. Prices vary by location and retailer. Enter your local price for accurate cost estimates.