Concrete Bag Calculator

Enter the volume of concrete you need in cubic feet and select a bag size to find the total bags, weight, and pallet count. Supports 40 lb, 50 lb, 60 lb, and 80 lb bags.

What is Concrete Bag?

A concrete bag calculator converts a volume of concrete (in cubic feet) into the number of pre-mixed bags required to fill that volume. Pre-mixed concrete bags — sold under brands like Quikrete, Sakrete, and Maximizer — contain Portland cement, sand, and gravel in the correct proportions. You add water, mix, and pour. This calculator supports the four standard bag sizes available at most home centers and lumber yards. Each bag size yields a specific volume of mixed concrete. A 40-pound bag yields approximately 0.30 cubic feet, a 50-pound bag yields 0.375 cubic feet, a 60-pound bag yields 0.45 cubic feet, and an 80-pound bag yields 0.60 cubic feet. These yields assume proper water ratios — too much water reduces strength, while too little makes the mix unworkable. The 80-pound bag is the most cost-effective on a per-cubic-foot basis, but the 60-pound bag is the most popular for DIY projects because it is easier to handle. For context, one cubic yard of concrete equals 27 cubic feet. At 0.60 cubic feet per bag, you would need 45 bags of 80-pound mix to make one cubic yard — weighing 3,600 pounds total. This is why ready-mix truck delivery (minimum order typically 1 cubic yard) is almost always more economical and practical for projects larger than about half a cubic yard (14 cubic feet). Bag concrete is best suited for small projects: post holes, small footings, patches, steps, and pads under 4 feet by 4 feet. Pallet quantities vary by bag size because pallets are limited by weight, not count. A standard pallet of 80-pound bags holds 42 bags (3,360 pounds). Lighter bags fit more bags per pallet — approximately 56 bags of 60-pound mix, 67 bags of 50-pound mix, or 84 bags of 40-pound mix. Ordering by the pallet from a building supply yard is significantly cheaper per bag than buying individually. The calculator reports total weight to help plan delivery and handling. A pickup truck with a standard payload rating of 1,000 to 1,500 pounds can safely carry 12 to 18 bags of 80-pound mix per trip. Exceeding the payload rating damages the truck suspension and creates a safety hazard. For large bag orders, have the supplier deliver or rent a trailer. Mix time and set time are important for project planning. Each 80-pound bag takes about 3 to 5 minutes to mix by hand in a wheelbarrow or mixing tub, or about 1 minute in a portable mixer. Concrete begins to set within 20 to 40 minutes after mixing and reaches initial strength in 24 to 48 hours. Full cure strength (typically 4,000 PSI for standard mix) takes 28 days.

How to Calculate

1. Calculate the total volume of concrete needed in cubic feet (length x width x depth in feet)
2. Select the bag size you plan to use (80 lb is most economical, 60 lb is easiest to handle)
3. Review the number of bags needed
4. Check the total weight to plan your transport
5. For large orders, note the pallet count for bulk ordering
6. Add 5-10% extra bags for waste, spillage, and minor miscalculations

Formula

Bags Needed = ceiling(Volume (cu ft) / Yield per Bag (cu ft)) Total Weight = Bags Needed x Bag Weight (lbs) Pallets = ceiling(Bags Needed / Bags per Pallet) Yield per bag: 40 lb = 0.30 cu ft, 50 lb = 0.375 cu ft, 60 lb = 0.45 cu ft, 80 lb = 0.60 cu ft Bags per pallet (based on 42 bags of 80 lb per pallet, scaled by weight): 40 lb = 84, 50 lb = 67, 60 lb = 56, 80 lb = 42

Example Calculation

27 cubic feet of concrete using 80 lb bags: Bags Needed = ceil(27 / 0.60) = ceil(45) = 45 bags Total Weight = 45 x 80 = 3,600 lbs Pallets = ceil(45 / 42) = ceil(1.07) = 2 pallets

Frequently Asked Questions