Concrete Bags Per Yard Calculator
Find out exactly how many 40, 50, 60, or 80 lb premix bags you need per cubic yard or for your total project volume. Includes pallet counts, total weight, water requirements, and a bag-versus-ready-mix cost comparison using verified Quikrete yield data.
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View Chart →Bags Needed Per Cubic Yard by Bag Size
Every bag size yields a fixed number of bags per cubic yard once you know its cubic foot yield. This range table shows the accepted count for each common bag weight, with a waste-adjusted range for real-world ordering.
| Bag Size | Yield Per Bag | Exact Bags/Yard | With 10% Waste | Notes |
|---|---|---|---|---|
| 40 lb | 0.30 ft³ | 90 bags | 99 bags | Small repairs, posts |
| 50 lb | 0.375 ft³ | 72 bags | 79 bags | Mid-size DIY jobs |
| 60 lb | 0.45 ft³ | 60 bags | 66 bags | Most common DIY size |
| 80 lb | 0.60 ft³ | 45 bags | 50 bags | Best value per cubic foot |
| 90 lb | 0.68 ft³ | 40 bags | 44 bags | High-strength commercial mix |
Yield values per Quikrete Concrete Mix Product Data Sheet #1101. Bags per yard = 27 ft³ ÷ bag yield.
Where the Bags-Per-Yard Number Comes From
Every premix bag lists a "yield," the volume of mixed concrete it produces once combined with water. Quikrete's official data sheet #1101 confirms an 80 lb bag yields 0.60 cubic feet, a 60 lb bag yields 0.45 cubic feet, and a 40 lb bag yields 0.30 cubic feet.
Since one cubic yard always equals 27 cubic feet, dividing 27 by the bag's yield gives the exact bag count. For 80 lb bags: 27 ÷ 0.60 = 45 bags. This math holds regardless of manufacturer, as long as the yield-per-bag figure is accurate for the product.
Bag weight (40, 60, 80 lb) refers to the dry powder mix, not the final cured volume. Heavier bags contain proportionally more aggregate and cement, which is why an 80 lb bag yields exactly twice the volume of a 40 lb bag despite only weighing double.
Step-by-Step Bag Count Walkthroughs
🪑 Fence Post Holes (5 posts)
Step 1: Each hole needs 0.5 ft³ of concrete
Step 2: 5 holes × 0.5 ft³ = 2.5 ft³ total
Step 3: 2.5 ft³ ÷ 0.60 ft³ (80 lb yield) = 4.2 bags
Step 4: Round up: 5 bags of 80 lb premix
Always round up to whole bags. Never split a bag for a partial pour.
🚶 Small Sidewalk Section
Step 1: Area is 25 sq ft, 4 in thick (0.333 ft)
Step 2: 25 × 0.333 = 8.3 ft³ raw volume
Step 3: 8.3 ft³ ÷ 0.45 ft³ (60 lb yield) = 18.4 bags
Step 4: Add 10% waste: 20 bags of 60 lb premix
Waste factor matters more on small jobs since one extra bag has more impact percentage-wise.
🏗️ Shed Footing (1.2 yd³)
Step 1: Volume already known: 1.2 cubic yards
Step 2: 1.2 × 27 = 32.4 ft³ total
Step 3: 32.4 ft³ ÷ 0.60 ft³ (80 lb yield) = 54 bags
Step 4: At 56 bags/pallet, this fits on 1 pallet
Above 1 cubic yard, compare bag cost against ready-mix delivery before committing to bags.
Mistakes That Cause Bag Shortages
Confusing bag weight with yield volume
An 80 lb bag does not yield 80 units of anything useful for volume math. It yields 0.60 cubic feet. Always use the yield figure, not the weight number, when calculating bag counts.
Rounding down instead of up
A calculation showing 44.2 bags needs 45 whole bags, not 44. Partial bags cannot be purchased or reliably measured on site, so always round up to the next whole bag.
Skipping the waste factor on small jobs
Small pours under 1 cubic yard often need a higher percentage buffer since hand-mixing spills more material relative to total volume. A 10% buffer on a 5-bag job means rounding to 6 bags, not 5.
Mixing different bag sizes mid-project
Switching between 60 lb and 80 lb bags mid-pour to "use up" partial pallets can create inconsistent water-to-cement ratios if not remeasured carefully for each bag size.
Not accounting for pallet break fees
Some suppliers charge extra for breaking a full pallet to sell partial quantities. Check whether buying exactly 54 bags versus a full 56-bag pallet changes your per-bag price.
Buying, Mixing, and Storage Logistics
Water Requirements
Quikrete's data sheet specifies about 6 pints (0.75 gallons) of water per 80 lb bag. Scale proportionally for other bag sizes: roughly 3 pints per 40 lb bag.
Lifting and Handling
80 lb bags require two-person lifting per most safety guidelines. Solo DIYers often choose 40 or 60 lb bags specifically to avoid injury risk on larger jobs.
Pallet and Delivery Minimums
Most suppliers sell bags individually or by pallet. Full pallets (56-80 bags depending on weight) often get a discounted per-bag price compared to individual purchases.
Storage Conditions
Unopened bags should be stored off the ground on pallets and kept dry. Moisture exposure through torn packaging can partially cure the mix before use, wasting the bag.
Frequently Asked Questions
It takes 45 bags of 80 lb premix to fill one cubic yard. Each 80 lb bag yields approximately 0.60 cubic feet per Quikrete's official product data sheet, and one cubic yard equals 27 cubic feet, so 27 ÷ 0.60 = 45 bags.
A 60 lb bag yields approximately 0.45 cubic feet. Dividing 27 cubic feet by 0.45 gives 60 bags per cubic yard.
A 40 lb bag yields approximately 0.30 cubic feet. Dividing 27 cubic feet by 0.30 gives 90 bags of 40 lb premix per cubic yard.
For small pours under roughly 1 cubic yard, bagged premix is usually cheaper and more practical since ready-mix delivery has short-load fees around $100. For pours over 2 to 3 cubic yards, ready-mix delivery is typically cheaper per cubic yard and requires far less labor.
The dry bag weight (40, 60, or 80 lb) refers to the unmixed powder. Once mixed with water, the yield volume stays the same, but total placed weight increases since cured concrete weighs roughly 133 to 150 lb per cubic foot depending on aggregate.
Standard pallets typically hold 56 bags of 80 lb concrete mix or 80 bags of 60 lb mix, though exact counts vary by manufacturer and distributor. Always confirm pallet quantity with your specific supplier before ordering.
Yes. Most contractors add 5 to 10% extra bags to cover spillage, mixing loss, and measurement variance. For a calculated 45-bag job, this means ordering 48 to 50 bags to avoid a mid-pour supply run.
Sources and Methodology
- Quikrete Concrete Mix Product Data Sheet #1101 — Official bag yields: 60 lb = 0.45 ft³, 80 lb = 0.60 ft³, 90 lb = 0.68 ft³: quikrete.com
- Carroll's Building Materials — Confirms 45 bags of 80 lb Quikrete Concrete Mix per cubic yard: carrollsbuildingmaterials.com
- Lowe's Q&A, Quikrete 110110 product listing — Confirms 0.6 cubic feet yield per 80 lb bag (1/45th cubic yard): lowes.com
- ConcreteCostEstimator.net, June 2026 — Verified 40, 60, 80 lb bag counts per cubic yard with 10% waste buffer recommendation.
- ACI 318-19 §26.4 — General concrete mixing and proportioning quality requirements referenced for context on mix consistency.
Last reviewed: July 2026. Reviewed by site author.
⚠️ Disclaimer
This calculator provides estimates for planning purposes. For permitted structural work, foundations, multi-story construction, retaining walls over 4 feet, and commercial projects, calculations must be verified by a licensed structural engineer per IBC 2024 §1604. ConcreteCalculate.com is not liable for structural decisions made from these estimates.
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