Enter your concrete volume in cubic yards and instantly get the number of 40 lb, 60 lb, and 80 lb bags required — with optional waste factor and bag cost estimate.
Free to use
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No sign-up required
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Industry-standard bag yields
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All three bag sizes at once
✓ 40 lb, 60 lb & 80 lb bags✓ Waste factor included✓ Cost estimate per bag size✓ Last verified May 2026
Your calculated or quoted concrete volume. Ready-mix is sold in cubic yards.Please enter a valid volume greater than 0.
Add 10% for standard jobs. 15% for complex pours. Never order exactly what the math says.
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US average: $5–$7 per 60 lb bag at hardware stores.
$
US average: $7–$9 per 80 lb bag. More concrete per bag but heavier to lift.
Results appear instantly. No sign-up required.
Your Bag Estimate
Volume (with waste)
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Cubic Yards (yd³)
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Cubic Feet (ft³)
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Cubic Meters (m³)
Bags Required (includes waste factor)
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40 lb bags
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60 lb bags
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80 lb bags
—Input Volume
—Waste Factor
—Total Weight (60 lb)
—Total Weight (80 lb)
Estimated Bag Material Cost
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60 lb bags total
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80 lb bags total
Bag material cost only. Add delivery, mixer rental, and labor as needed. For jobs over 1 yd³, compare with ready-mix pricing using our Ready-Mix vs Bagged Cost Calculator.
Step 1: Convert input to cubic feet → yd³ × 27 = ft³ (or m³ × 35.3147)
Step 2: Apply waste factor → Final ft³ = ft³ × (1 + waste% ÷ 100)
Step 3: Bags = CEIL(Final ft³ ÷ bag yield) — always round up, never down
Bag yields (industry standard, per manufacturer data):
40 lb bag = 0.30 ft³ | 60 lb bag = 0.45 ft³ | 80 lb bag = 0.60 ft³
Find your cubic yard figure.
Get the volume in cubic yards from your project calculator, your architect's drawings, or your ready-mix supplier's quote. If you have cubic feet, select "cubic feet" from the unit dropdown — the converter handles the conversion. Do not eyeball or guess — even a quarter yard off means you could be short 10–15 bags mid-pour.
Set your waste factor.
Leave it at 10% for clean, simple pours. Bump it to 15% if the area has irregular edges, you're mixing by hand on uneven ground, or it's your first time pouring. The waste factor is applied before the bag count is calculated — so what you see is what you should actually buy, not the theoretical minimum.
Enter your local bag prices (optional).
Type in what 60 lb and 80 lb bags cost at your local hardware store. The calculator shows total cost for both sizes so you can make an apples-to-apples comparison before loading your cart. Prices vary widely by region and vendor — always check current shelf price.
Use the results to buy the right quantity.
The bag counts are already rounded up to the next whole bag — concrete doesn't come in fractions. If the cost comparison shows 80 lb bags are significantly cheaper, but you're working alone, the 60 lb count is still the smarter choice. Your back will thank you, and mixing fatigue causes consistency problems on larger pours.
⚠ Pro Tip: For any pour over 1 cubic yard, seriously reconsider bagged concrete. Mixing 50–100 bags by hand or in a rented drum mixer takes 4–6 hours and produces inconsistent mix quality from batch to batch. One cubic yard of ready-mix delivered and poured takes 30 minutes. The truck delivery short-load fee ($50–$150) is almost always worth it.
Cubic Yards to Bags Formula
The conversion is straightforward but critically depends on using the correct bag yield. Manufacturers publish yields in cubic feet of mixed concrete per bag — not per pound. Here's the full process:
Step
Formula
Example (2 yd³, 10% waste)
1. Convert yd³ to ft³
yd³ × 27
2 × 27 = 54.00 ft³
2. Apply waste factor
ft³ × (1 + waste%/100)
54.00 × 1.10 = 59.40 ft³
3. 40 lb bags needed
CEIL(ft³ ÷ 0.30)
CEIL(59.40 ÷ 0.30) = 198 bags
4. 60 lb bags needed
CEIL(ft³ ÷ 0.45)
CEIL(59.40 ÷ 0.45) = 132 bags
5. 80 lb bags needed
CEIL(ft³ ÷ 0.60)
CEIL(59.40 ÷ 0.60) = 99 bags
Quick-Reference Bag Count Table
Bags required per cubic yard — no waste factor. Add 10% to each figure for real-world ordering.
Volume
Cubic Feet
40 lb Bags
60 lb Bags
80 lb Bags
0.25 yd³
6.75 ft³
23
15
12
0.50 yd³
13.50 ft³
45
30
23
0.75 yd³
20.25 ft³
68
45
34
1.00 yd³
27.00 ft³
90
60
45
1.50 yd³
40.50 ft³
135
90
68
2.00 yd³
54.00 ft³
180
120
90
3.00 yd³
81.00 ft³
270
180
135
5.00 yd³
135.00 ft³
450
300
225
10.00 yd³
270.00 ft³
900
600
450
Exact figures with no waste. Always add a minimum 10% before placing an order. Bag counts always round up to the nearest whole bag.
Which Bag Size Should You Use?
The right bag size isn't just about cost per bag — it's about how many bags you can physically mix in a session without compromising quality. Here's how to choose based on your project and situation:
Bag size selection guide by project type and working conditions.
Bag Size
Yield per Bag
Best For
Notes
40 lb
0.30 ft³
Repairs, post holes, tight access, solo elderly/limited-strength work
Heaviest cost per ft³. Use only when weight or access dictates it.
60 lb
0.45 ft³
Most DIY projects; solo homeowner pouring patios, paths, piers
Best balance of yield and manageable weight. The standard DIY choice.
80 lb
0.60 ft³
Crew work, contractor jobs, larger pours with help on site
Best cost per ft³. But 80 lb is genuinely heavy — repetitive lifting leads to fatigue and inconsistent mix water.
The cost difference between 60 lb and 80 lb bags is typically $1.50–$2.50 per bag. On a 50-bag job that's $75–$125 saved with 80 lb bags. That's meaningful — but not if mixing fatigue causes you to add too much water on bags 35–50, weakening the mix. Know your limits before loading up exclusively on 80s.
Common Mistakes When Converting Yards to Bags
⚠️
Using cubic feet instead of cubic yards (or vice versa).
A cubic yard is 27 cubic feet — not 3. If your project calculator gave you 5 cubic feet and you entered it as 5 cubic yards, you're ordering 27 times more concrete than you need. Always verify which unit your volume figure is in before converting. This is the single most costly mistake in bagged concrete ordering.
📦
Rounding down bag counts.
Always round up to the next whole bag. Concrete comes in whole bags — you cannot mix three-quarters of a bag and store the rest for next weekend. Running short by even two or three bags at the end of a pour forces a cold joint or a trip to the store mid-job, neither of which ends well.
🧮
Using the wrong bag yield.
Different bag sizes yield different volumes — and some specialty mixes (fast-set, high-strength, fiber-reinforced) yield slightly less per bag than standard mix. If you're not using standard Quikrete or Sakrete concrete mix, check the bag's printed yield before using this converter's defaults.
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Adding too much water when mixing bags.
On hot days or large pours, it's tempting to add extra water to make the mix more workable. Too much water significantly reduces concrete strength — every extra pound of water per bag can cut compressive strength by 15–20%. Use a plasticizer or mid-range water reducer if you need workability, not extra water.
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Choosing bags for a job that needs a truck.
For anything over 1 cubic yard, bagged concrete is the wrong tool. It takes 45 bags of 80 lb concrete to make one cubic yard — mixing that takes hours and the batch-to-batch consistency is far worse than ready-mix. Delivery minimums and short-load fees exist, but they're almost always justified over the labor and quality cost of bagging a large pour.
Frequently Asked Questions
One cubic yard of concrete requires exactly 45 bags of 80 lb concrete (each 80 lb bag yields 0.60 ft³, and one cubic yard = 27 ft³; 27 ÷ 0.60 = 45). In practice, you should order at least 50 bags to account for waste, spillage, and mixing inconsistency — that's a 10% overage. If your project calls for 2 cubic yards, plan for 100 bags of 80 lb concrete as your working order quantity.
One cubic yard requires exactly 60 bags of 60 lb concrete (each 60 lb bag yields 0.45 ft³; 27 ÷ 0.45 = 60). With a 10% waste factor — which you should always include — that becomes 66 bags per cubic yard. The 60 lb bag is the most common choice for solo homeowners because it's manageable to lift and carry repeatedly without the fatigue issues that come with 80 lb bags on larger pours.
80 lb bags are cheaper per cubic foot of concrete. A typical 80 lb bag costs $7–$9 and yields 0.60 ft³, putting the cost at roughly $12–$15 per cubic foot. A 60 lb bag costs $5–$7 and yields 0.45 ft³, putting the cost at roughly $11–$15.50 per cubic foot. The difference is small. At scale (say, 2 cubic yards), you might save $30–$60 by going with 80 lb bags over 60 lb bags — but only if you have the crew to handle the weight without adding extra mix water from fatigue. Enter your local bag prices in this converter to see the exact comparison for your job.
By hand in a wheelbarrow or mortar tub: an experienced person can mix 4–6 bags of 80 lb concrete per hour — and that pace is exhausting. Using a rented electric drum mixer, you can mix 8–12 bags per hour with one person loading and one person guiding the pour. At those rates, 1 cubic yard (45 bags of 80 lb) takes 4–8 person-hours by hand or 2–4 hours with a mixer. Factor this into your scheduling — concrete work in extreme heat or direct sun cuts pace significantly.
Quikrete's published yields for their standard concrete mix are: 40 lb bag = 0.30 ft³, 60 lb bag = 0.45 ft³, 80 lb bag = 0.60 ft³. These are the same yields used by most standard concrete mix brands including Sakrete. Fast-setting mixes (Quikrete Fast-Setting Concrete Mix) have slightly different yields — always check the printed figure on the bag you're actually buying, as formulations can vary by product line and region.
The industry rule of thumb: use bagged concrete for pours under 0.5–1 cubic yard. For anything above 1 yard, ready-mix concrete is almost always more economical and produces a better result. At 1 cubic yard, bagged concrete requires 45–90 bags depending on bag size, several hours of mixing, and produces batch-to-batch variation. Ready-mix delivers a precisely proportioned, uniformly mixed load in one shot. Short-load fees from ready-mix plants ($50–$200 for less than a full truck) are real, but they're usually worth it once you're past the 1-yard threshold.
To convert cubic feet to bags: divide your cubic footage by the bag yield and round up. For 80 lb bags (0.60 ft³ yield): bags = CEIL(ft³ ÷ 0.60). For 60 lb bags (0.45 ft³): bags = CEIL(ft³ ÷ 0.45). For 40 lb bags (0.30 ft³): bags = CEIL(ft³ ÷ 0.30). Always round up — you can't mix a partial bag and store the remainder usefully. Select "cubic feet" from the unit dropdown in the converter above and it does this automatically for you.
At current US national averages: one cubic yard in 80 lb bags costs approximately $315–$405 in materials alone (45 bags at $7–$9 each). Ready-mix concrete for one yard costs $130–$200 for the concrete itself, plus a short-load delivery fee of $50–$200, bringing the total to roughly $180–$400. So the raw material cost is comparable at small volumes — but ready-mix saves 4–6 hours of labor and produces a far more consistent result. The break-even point where ready-mix clearly wins is typically around 1–2 cubic yards for a working homeowner factoring in their time.
Unopened bags store for 6–12 months if kept completely dry — even brief humidity exposure starts the hydration process and causes lumping that weakens the mix. Once a bag has been opened or is partially set, it's effectively unusable for structural work. In practice, store bags off the ground on pallets, wrapped in plastic sheeting, away from any ground moisture. But the better move is to calculate accurately (including waste), order exactly what you need, and avoid leftover bags entirely by using this converter.
Yes, slightly. Standard concrete mix (Quikrete 5000, Quikrete Concrete Mix, Sakrete Concrete Mix) yields the 0.30/0.45/0.60 ft³ figures used in this calculator. High-strength mixes and fiber-reinforced mixes may yield 3–8% less per bag because they contain more cement and aggregate per pound. Fast-setting mixes generally yield the same volume. Always check the bag you're actually buying — the yield in cubic feet is printed on the label. If it differs from the standard yield, factor that difference in manually before ordering.
