Enter your Project Type, Length, Width, and Thickness, then set your Concrete Mix Ratio, Cement Bag Size, and Waste Factor to find out exactly how many Cement Bags you need — plus your total Concrete Volume, Cement Weight, and how much Sand and Gravel to order so nothing runs short on pour day.
Cement Bags Needed
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Total Cement Weight
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Concrete Volume
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Sand Needed
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Gravel Needed
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Cement is a binding agent that hardens when mixed with water. Concrete is a mixture of cement, sand, gravel, and water. Cement makes up about 10-15% of concrete by volume.
For a typical 4-inch thick slab using a 1:2:4 mix ratio, you'll need approximately 1 cubic foot of cement for every 15 cubic feet of concrete. Use our calculator above for precise measurements.
Mix ratios show the proportion of cement:sand:gravel. For example, 1:2:4 means 1 part cement, 2 parts sand, and 4 parts gravel. Higher cement ratios create stronger concrete.
Cement typically sets in 24-48 hours but takes 28 days to reach full strength. Factors like temperature, humidity, and mix design affect curing time.
Yes, it's recommended to add 5-10% extra material to account for spillage, waste, and minor measurement variations. Our calculator includes a waste factor option.
Yes, but it's easier to calculate and purchase using one bag size. Larger bags (60-80 lbs) are more economical for big projects, while smaller bags (40-50 lbs) are easier to handle.
Portland cement is the most common type of cement used in concrete. It's made from limestone and clay, heated to high temperatures, and ground into a fine powder.