Cubic Yards to Bags of Concrete Conversion
Calculate how many bags of pre-mixed concrete equal bulk cubic yards.
To convert between bulk volume and bags, you must select the weight/yield of the bags you are using. A standard cubic yard contains 27 cubic feet of volume.
Definitions: Cubic Yards vs. Bags of Concrete
A Cubic Yard (yd³) is the standard unit of measurement used by contractors and concrete ready-mix suppliers to measure the physical volume of bulk materials. It measures three-dimensional space, representing a cube that is 3 feet long, 3 feet wide, and 3 feet deep. One single cubic yard contains exactly 27 cubic feet. Read more on the Cubic Yard Wikipedia page.
A Bag of Concrete contains dry, pre-mixed Portland cement, sand, and gravel. When you add water, it undergoes a chemical reaction (hydration) to form solid concrete. Because bags are heavy and meant to be carried by hand, they are sold by weight (typically 40, 50, 60, or 80 lbs). Each weight correlates to a specific volume “yield” measured in cubic feet once mixed with water.
Cubic Yards to Bags of Concrete
Because there are 27 cubic feet in one yard, calculating bags requires knowing the cubic-foot yield of your specific bag size. For example, an 80-lb bag yields roughly 0.60 cubic feet.
- To calculate how many bags equal a Cubic Yard:
Formula:Bags = (Cubic Yards × 27) ÷ Bag Yield (in cu ft)
Example: You need 2 cubic yards of concrete using 80-lb bags (0.6 ft³ yield).(2 × 27) ÷ 0.60 = 90 Bags. - To calculate Cubic Yards from a pile of Bags:
Formula:Cubic Yards = (Number of Bags × Bag Yield) ÷ 27
Example: You have a pallet of 45 60-lb bags (0.45 ft³ yield).(45 × 0.45) ÷ 27 = 0.75 Cubic Yards.
Bags Required to Fill 1 Cubic Yard
A quick visual reference showing exactly how many bags you need to purchase at the hardware store to equal one bulk yard of concrete.
| Bag Size (Weight) | Mixed Volume Yield (ft³) | Total Bags per Yard |
|---|---|---|
| 40 lb Bag | 0.30 ft³ | 90.0 Bags |
| 50 lb Bag | 0.375 ft³ | 72.0 Bags |
| 60 lb Bag | 0.45 ft³ | 60.0 Bags |
| 80 lb Bag | 0.60 ft³ | 45.0 Bags |
Frequently Asked Questions
This depends entirely on the size of the bags you purchase. It takes exactly 45 bags of 80-lb concrete, 60 bags of 60-lb concrete, or 90 bags of 40-lb concrete to equal 1 cubic yard (27 cubic feet).
One 80-pound bag of pre-mixed concrete yields approximately 0.60 cubic feet. Because a cubic yard contains 27 cubic feet, you will need exactly 45 bags (27 ÷ 0.60 = 45).
A standard 60-lb bag yields about 0.45 cubic feet of mixed concrete. To convert this to yards, divide by 27. One 60-lb bag equals approximately 0.0167 cubic yards.
For small projects under 1 to 1.5 cubic yards, buying bags and mixing yourself is usually cheaper and more practical. However, for larger projects (2+ yards), ordering ready-mix concrete delivered by a truck is significantly cheaper, faster, and ensures a more consistent structural mix.
Poor man’s concrete often refers to soil-cement (mixing portland cement directly into the native soil and compacting it) or dry-pouring (dumping dry concrete mix into a hole or form and relying on ground moisture or a light soaking to cure it). Dry pouring is frowned upon for structural loads.
Yes, a 5-gallon bucket provides plenty of space to mix a single 40-lb, 50-lb, or 60-lb bag of concrete. Mixing an 80-lb bag in a bucket can be done but gets very messy and difficult to stir. A heavy-duty drill with a paddle mixer attachment works best.
Technically yes, but it is highly advised against for slabs or structural footings. Concrete poured directly on dirt is susceptible to shifting, cracking, and moisture wicking. A proper sub-base of 3-4 inches of compacted crushed gravel provides drainage and a stable foundation.
The high sugar content in Coca-Cola acts as a powerful retarder when mixed into wet concrete. It drastically slows down or completely prevents the hydration process, stopping the concrete from setting and hardening. It is an old contractor trick used to wash out tools or ruin a bad batch.
The most affordable way to mix large amounts of concrete by hand is to buy the raw ingredients (Portland cement, sand, and gravel) separately in bulk and mix them yourself using a 1-2-3 ratio (1 part cement, 2 parts sand, 3 parts gravel) in a rented concrete mixer.
Dynamic Conversion Table (1 to 1000)
Use the tabs below to toggle the reference chart. Values are updated live based on your selected Bag Size and decimal precision.
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