Convert a bag count into cubic yards before you buy, mix or compare material options. Choose a common bag size, enter the exact yield printed by the manufacturer, and calculate total cubic feet, cubic yards, cubic metres and an optional bag-cost estimate. This concrete bags to cubic yards calculator is designed for slabs, posts, repairs, pads, steps and other projects where packaged concrete is being considered.
Pick a common bag size to load an example yield, then confirm that yield against the exact product you plan to use. Manufacturer yield is more important than bag weight when converting bags into finished concrete volume.
Your result will appear here after you press Calculate Cubic Yards.
The PDF includes bag size, bag count, entered yield, total cubic feet, cubic yards, cubic metres, estimated bag cost and the ConcreteCreek.com source label.
A cubic yard contains 27 cubic feet. The bag count first becomes cubic feet using the product yield, then cubic feet are divided by 27 to get cubic yards.
The tool keeps the conversion simple while still showing the numbers that matter when you are buying packaged concrete and comparing it with ready-mix volume.
Enter the total number of bags you have, plan to buy or want to compare.
Use the finished cubic-foot yield printed for the exact concrete mix.
See the total volume in the unit commonly used for larger concrete quantities.
Compare the same result with metric volume when plans or suppliers use metres.
Multiply the bag count by your entered price to estimate material-only bag cost.
Save the main conversion details for shopping, estimating or project notes.
The fastest way to convert concrete bags to cubic yards is to work from the finished yield per bag. Packaged concrete is sold by weight, but a concrete project is normally estimated by volume. Those are different measurements. A bag may be labelled 40 lb, 50 lb, 60 lb or 80 lb, yet the useful conversion number is the amount of mixed concrete the manufacturer says that bag produces.
Once you know the yield in cubic feet, the calculation has two steps. First, multiply the number of concrete bags by the cubic-foot yield of one bag. That gives total cubic feet. Second, divide total cubic feet by 27 because one cubic yard contains 27 cubic feet. The calculator above performs both steps and also converts the result to cubic metres.
Cubic Yards = Number Of Bags × Yield Per Bag (ft³) ÷ 27
For example, suppose an 80 lb concrete mix states a yield of 0.60 cubic foot per bag. Forty-five bags would produce a theoretical 27 cubic feet: 45 × 0.60 = 27. Divide 27 by 27 and the result is 1.00 cubic yard. If your product states a different yield, enter that value instead of assuming every 80 lb bag is identical.
A yard is three feet long. A cubic yard is a three-dimensional cube measuring 3 ft × 3 ft × 3 ft. Multiplying those dimensions gives 27 cubic feet. That relationship is what makes the conversion from bag yield in cubic feet to cubic yards straightforward.
3 ft × 3 ft × 3 ft = 27 ft³ = 1 yd³
If you are working in metric units, one cubic yard is approximately 0.765 cubic metre. The calculator uses the more precise conversion internally so the metric result remains useful even when you enter a large bag quantity.
One of the most common estimating mistakes is to convert bags from weight alone. A bag's weight tells you how much dry material is packaged, but it does not automatically tell you the exact finished volume after mixing. Different concrete products can use different aggregates, cement contents, additives and mix designs. Because of that, two products with the same nominal bag weight do not have to publish identical yields.
The four calculator presets are therefore starting points rather than fixed industry laws. They reflect example published yields seen in current packaged concrete products: 40 lb at about 0.30 ft³, 50 lb at about 0.38 ft³, 60 lb at about 0.45 ft³ and 80 lb at about 0.60 ft³. Before buying a pallet or planning a large pour, replace the preset with the exact value shown on your product.
The table below uses the example yields loaded into the calculator. It is helpful for quick planning, but it should not replace the yield printed for your actual product.
| Example Bag Size | Example Yield Per Bag | Bags For 1 yd³ | Bags For 0.5 yd³ | Bags For 0.25 yd³ |
|---|---|---|---|---|
| 40 lb Bag | 0.30 ft³ | 90 Bags | 45 Bags | 23 Bags |
| 50 lb Bag | 0.38 ft³ | 72 Bags | 36 Bags | 18 Bags |
| 60 lb Bag | 0.45 ft³ | 60 Bags | 30 Bags | 15 Bags |
| 80 lb Bag | 0.60 ft³ | 45 Bags | 23 Bags | 12 Bags |
Values in the half-yard and quarter-yard columns are rounded up to whole bags where needed. For example, half a cubic yard is 13.5 cubic feet. At 0.60 ft³ per 80 lb bag, 13.5 ÷ 0.60 = 22.5 bags, so 23 whole bags are needed to reach or exceed the theoretical half-yard volume.
Imagine you have 30 bags of a 60 lb concrete mix and the label states a yield of 0.45 cubic foot per bag. Multiply 30 by 0.45 to get 13.5 cubic feet. Then divide 13.5 by 27. The result is 0.50 cubic yard.
30 Bags × 0.45 ft³ = 13.50 ft³ → 13.50 ÷ 27 = 0.50 yd³
If 20 bags each yield 0.60 cubic foot, the total volume is 12 cubic feet. Divide 12 by 27 and you get about 0.444 cubic yard. That is less than half a cubic yard, which is useful to know before deciding whether to continue with bags or compare a delivered ready-mix option.
At 0.60 cubic foot per bag, 100 bags produce 60 cubic feet. Dividing by 27 gives about 2.222 cubic yards. At 0.45 cubic foot per bag, the same 100 bags would produce only 45 cubic feet, or about 1.667 cubic yards. This difference shows exactly why a reliable bags-to-yards calculator must use yield instead of bag count alone.
The calculator includes an optional price-per-bag field so you can compare material cost at the same time as volume. If 45 bags cost $7.50 each, the material-only bag total is $337.50. That number does not include sales tax, delivery, mixer rental, tools, reinforcement, base material, formwork or labor.
A cost comparison becomes especially useful as the bag count grows. The cheapest price per bag is not always the cheapest way to place a larger concrete volume. Mixing time, mixer capacity, lifting, water control, finishing time and the need to keep a pour continuous can all affect the practical decision.
This page converts the bag quantity you enter into theoretical finished volume. Real projects may require extra material because of uneven excavation, low spots, overfilled forms, spillage, material left in the mixer or small dimensional changes. The right allowance depends on the project rather than a universal percentage.
For a slab or footing, first determine the required concrete volume from the actual dimensions. Then use a cubic yards to concrete bags calculator to work backward from the required yardage to a purchase quantity. If you already know how many bags you have and simply want to know their volume, the current concrete bags to cubic yards calculator is the correct direction.
These three measurements answer different questions. Bags tell you how many packaged units you have. Cubic feet describe the combined volume produced by those bags. Cubic yards express the same volume in a larger unit that is easier to compare with ready-mix concrete, excavation volumes and many construction estimates.
If you only need the intermediate volume, use our concrete bags to cubic feet calculator. If you already have cubic feet and need yards, use the cubic feet to cubic yards calculator. For the reverse direction, the cubic yards to concrete bags calculator helps turn a required volume into an estimated purchase quantity.
Bagged concrete is convenient for small repairs, fence posts, short curbs, steps, small pads and projects where truck access is difficult. It also gives you flexibility to mix a small amount at a time. The tradeoff is labor: every bag must be moved, opened, measured with water, mixed and placed.
Ready-mix concrete is delivered by volume and is often easier to manage for larger continuous pours. However, ready-mix can involve delivery minimums, short-load charges, access restrictions, waiting-time rules or pump requirements. There is no single break-even volume that applies everywhere, so compare local delivered pricing with the number of bags, labor and equipment your project would require.
A bag weight identifies the package. The published yield connects that package to the finished concrete volume.
An example yield used by some packaged concrete products. Verify before use.
A useful preset for products that publish approximately this finished yield.
At this yield, 60 bags equal a theoretical 27 ft³ or 1 yd³.
At this yield, 45 bags equal a theoretical 27 ft³ or 1 yd³.
These examples use the stated example yield in each row. Change the yield in the calculator whenever your manufacturer lists a different figure.
| Bag Example | Bag Count | Yield Per Bag | Total Cubic Feet | Total Cubic Yards |
|---|---|---|---|---|
| 80 lb Example | 10 Bags | 0.60 ft³ | 6.00 ft³ | 0.222 yd³ |
| 80 lb Example | 20 Bags | 0.60 ft³ | 12.00 ft³ | 0.444 yd³ |
| 80 lb Example | 45 Bags | 0.60 ft³ | 27.00 ft³ | 1.000 yd³ |
| 60 lb Example | 30 Bags | 0.45 ft³ | 13.50 ft³ | 0.500 yd³ |
| 60 lb Example | 60 Bags | 0.45 ft³ | 27.00 ft³ | 1.000 yd³ |
| 50 lb Example | 72 Bags | 0.38 ft³ | 27.36 ft³ | 1.013 yd³ |
| 40 lb Example | 90 Bags | 0.30 ft³ | 27.00 ft³ | 1.000 yd³ |
Answers to common questions about 40 lb, 50 lb, 60 lb and 80 lb concrete bags, product yield, cubic feet and cubic yards.
Multiply the number of bags by the manufacturer-stated yield per bag in cubic feet, then divide by 27. The 27 comes from one cubic yard containing 27 cubic feet.
Using an example yield of 0.60 cubic foot per 80 lb bag, one cubic yard is about 45 bags because 27 ÷ 0.60 = 45. Always verify the yield printed for the exact product you are buying.
At an example yield of 0.45 cubic foot per 60 lb bag, 60 bags make about one cubic yard because 27 ÷ 0.45 = 60.
At an example yield of 0.38 cubic foot per 50 lb bag, the mathematical result is about 71.1 bags, so you would need 72 whole bags to meet or exceed one cubic yard if that product truly yields 0.38 cubic foot per bag.
At an example yield of 0.30 cubic foot per 40 lb bag, 90 bags equal about one cubic yard.
Bag weight alone does not define finished volume. Mix proportions, aggregate grading, product formulation, required water and manufacturer specifications can produce different stated yields.
Use the bag's published yield whenever possible. Weight is helpful for identifying the product size, but yield is the number that directly converts a bag count into volume.
The main conversion reports the theoretical finished volume from the yield you enter. If you expect spillage, uneven forms, over-excavation or other losses, plan that separately rather than assuming every project needs the same percentage.
Yes. Select a preset as a starting point, then replace the yield with the exact figure shown on the product data sheet or bag. That keeps the calculation tied to the product you actually plan to use.
It can be done, but one cubic yard may require dozens of bags. For larger continuous pours, compare the labor, mixer capacity, working time, delivery access and total cost with ready-mix concrete.
Cubic yards = number of bags × cubic feet yielded per bag ÷ 27.
Yes. After calculating, use the PDF button to save a summary showing the selected bag size, entered yield, bag count, cubic feet, cubic yards, cubic metres and estimated bag cost.
Use official manufacturer data for bag yield and authoritative unit references when checking a concrete bags to cubic yards conversion.
Published example yields for several packaged concrete bag sizes, including 40 lb, 60 lb and 80 lb bags.
View Sakrete Product DataManufacturer product information showing example yields for 50 lb, 60 lb and 80 lb bags.
View 5000 Plus DataA manufacturer calculator for estimating bag quantities for concrete and related packaged products.
Visit QUIKRETE CalculatorU.S. National Institute of Standards and Technology conversion information for customary and metric volume units.
View NIST ConversionsManufacturer yields can vary by product. The preset values in this calculator are examples and should be replaced with the published yield for the exact mix being used.