Enter your bag count and size to instantly convert concrete bags to cubic yards, cubic feet, and cubic meters. Works for 40 lb, 60 lb, and 80 lb bags from any brand.
Free to use
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No sign-up required
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Standard industry bag yields
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All three bag sizes supported
Count your bags or determine your bag order quantity.
If you've already bought bags, count them. If you're planning a purchase, estimate based on your project area and thickness — or use our Concrete Slab Calculator to get a cubic yard figure first, then come here to reverse-check how many bags that represents.
Select your bag size from the dropdown.
The size is printed on the bag label. Standard US sizes are 40 lb, 60 lb, and 80 lb. The yield values used — 0.30 ft³, 0.45 ft³, and 0.60 ft³ respectively — are the manufacturer-published yields for mixed concrete at the recommended water-to-mix ratio. Custom or non-standard bag weights are not common in US retail.
Enter a buffer percentage if needed.
If you're verifying whether the bags you already own are enough for your project, enter 0. If you're calculating how much concrete bags in your hand will cover and want a conservative number, enter 10–15% to account for spills, uneven subgrade, or waste.
Read your cubic yards result and cross-reference your project needs.
The cubic yards number is what matters when comparing to ready-mix quotes or other calculators. Use the cubic feet figure when referencing manufacturer bag yields or planning small pours. If the volume you need exceeds 1 cubic yard, strongly consider ordering ready-mix instead of mixing bags — it will be faster, cheaper per yard, and more consistent.
⚠ Pro Tip: Bag yields assume the mix is done correctly at the labeled water ratio. Every extra splash of water you add to make mixing easier reduces the final volume and — more importantly — weakens the concrete. A bag that should yield 0.45 ft³ can easily yield 0.40 ft³ if the mix is sloppy. Stick to the water ratio on the bag and your volume calculations will hold.
Bags to Cubic Yards Formula Explained
The conversion is straightforward: multiply the number of bags by the yield per bag to get cubic feet, then divide by 27 to get cubic yards. The only variable is the yield, which is determined by bag size.
Step
Formula
Example (60 bags × 60 lb)
1. Identify yield per bag
60 lb bag = 0.45 ft³
0.45 ft³ per bag
2. Total cubic feet
Bags × Yield
60 × 0.45 = 27.00 ft³
3. Convert to cubic yards
ft³ ÷ 27
27.00 ÷ 27 = 1.00 yd³
4. Convert to cubic meters
ft³ × 0.0283168
27.00 × 0.0283168 = 0.765 m³
Bag Count Reference Table — Pre-Calculated Volumes
Concrete volume by bag count and size. No buffer applied. Divide ft³ by 27 to get yd³.
Bags
40 lb (ft³)
40 lb (yd³)
60 lb (ft³)
60 lb (yd³)
80 lb (ft³)
80 lb (yd³)
5
1.50
0.056
2.25
0.083
3.00
0.111
10
3.00
0.111
4.50
0.167
6.00
0.222
20
6.00
0.222
9.00
0.333
12.00
0.444
27
8.10
0.300
12.15
0.450
16.20
0.600
30
9.00
0.333
13.50
0.500
18.00
0.667
45
13.50
0.500
20.25
0.750
27.00
1.000
60
18.00
0.667
27.00
1.000
36.00
1.333
90
27.00
1.000
40.50
1.500
54.00
2.000
120
36.00
1.333
54.00
2.000
72.00
2.667
180
54.00
2.000
81.00
3.000
108.00
4.000
Yields: 40 lb = 0.30 ft³, 60 lb = 0.45 ft³, 80 lb = 0.60 ft³. These are standard manufacturer-published yields at the correct water-to-mix ratio.
Which Bag Size Should You Use?
The choice between 40 lb, 60 lb, and 80 lb bags affects your total bag count, cost, and how much physical work you're signing up for. Here's how the three sizes compare for real jobsite situations.
Comparison of standard concrete bag sizes for US residential and commercial projects.
Bag Size
Yield per Bag
Bags per yd³
Typical Use Case
Notes
40 lb
0.30 ft³
90 bags
Small repairs, fence posts, DIY projects
Easiest to lift; most expensive per yard
60 lb
0.45 ft³
60 bags
Patio edges, post holes, small slabs
Best balance of manageability and economy for solo work
80 lb
0.60 ft³
45 bags
Driveways, slabs, footings, commercial work
Most economical per yard; requires a helper or mixer
For any job requiring more than 1 cubic yard — roughly 45 bags of 80 lb — call a ready-mix supplier instead. The ready-mix will cost less per yard than bags, arrive already mixed, and spare you hours of labor. Most suppliers have a minimum of 1–2 yards, with short-load fees for smaller orders.
Bags per Cubic Yard — Quick Reference
Exact number of bags needed for various volumes, rounded up to the nearest whole bag.
Volume Needed
40 lb Bags
60 lb Bags
80 lb Bags
0.25 yd³ (6.75 ft³)
23
15
12
0.50 yd³ (13.5 ft³)
45
30
23
0.75 yd³ (20.25 ft³)
68
45
34
1.00 yd³ (27 ft³)
90
60
45
1.50 yd³ (40.5 ft³)
135
90
68
2.00 yd³ (54 ft³)
180
120
90
Bag counts rounded up — never round down when buying bags.
Common Mistakes When Converting Bags to Cubic Yards
⚠️
Using the wrong yield per bag.
Not all bags yield the same amount — a 40 lb bag yields 0.30 ft³, a 60 lb yields 0.45 ft³, and an 80 lb yields 0.60 ft³. Mixing these up or assuming all bags yield the same amount will throw off your entire volume calculation. Always check the bag size before entering it.
📐
Confusing cubic feet with cubic yards in the result.
The most common error: reading the cubic feet result and thinking it's cubic yards. 27 cubic feet = 1 cubic yard. Ordering one "yard" when you mean one "cubic foot" is an expensive mistake in either direction. Always confirm which unit you're handing to your supplier.
💧
Over-watering the mix and reducing actual yield.
Published bag yields assume the mix is made at the recommended water ratio. Adding too much water — which is extremely common because it makes mixing easier — can reduce actual yield by 5–15% per bag. If you need to mix dozens of bags, expect your real volume to be slightly less than the theoretical total if your crew's water discipline is loose.
🏪
Assuming bag yields vary by brand.
They don't, for standard Portland-cement-based concrete mixes. Quikrete, Sakrete, and store-brand 80 lb bags all yield 0.60 ft³. Some specialty mixes (rapid-set, high-strength, fiber-reinforced) may have slightly different yields — always check the product label if you're using anything other than standard concrete mix.
🔢
Rounding down instead of up when buying bags.
If your calculation says you need 43.7 bags, buy 44 — never 43. Concrete bags only come in whole units and running short mid-pour creates a cold joint. Always round up to the next whole bag, and then add an extra few bags as buffer.
Frequently Asked Questions
It takes exactly 60 bags of 60 lb concrete to make 1 cubic yard. Each 60 lb bag yields 0.45 cubic feet, and 1 cubic yard equals 27 cubic feet. So: 27 ÷ 0.45 = 60 bags. This is one of the easiest numbers to remember in concrete estimating — 60 bags of 60 lb is exactly one yard. For 80 lb bags, it's 45 bags per yard. For 40 lb bags, it's 90 bags per yard.
It takes exactly 45 bags of 80 lb concrete to make 1 cubic yard. Each 80 lb bag yields 0.60 cubic feet. 27 ÷ 0.60 = 45 bags. This is the most common bag size on commercial jobsites because it minimizes the total bag count and cost per yard. However, at 80 lbs each, moving and mixing that many bags is physically demanding — most contractors use a mixer drum and have a helper for any job over half a yard.
It takes 90 bags of 40 lb concrete to make 1 cubic yard. Each 40 lb bag yields 0.30 cubic feet. 27 ÷ 0.30 = 90 bags. At 40 lbs each, these are the easiest to carry, but the most expensive per yard and create the most mixing labor. They're best suited for small repairs, setting a few fence posts, or situations where you physically can't manage heavier bags.
Yes, for standard concrete mix. Quikrete 80 lb bags and Sakrete 80 lb bags both yield 0.60 cubic feet per bag when mixed at the specified water ratio. The same holds for 60 lb and 40 lb standard mix bags from either brand. Where yields can differ is in specialty products — Quikrete Fast-Setting Concrete, high-strength mixes, or fiber-reinforced products may have slightly different yields published on their labels. Always verify the label yield for specialty mixes.
The general rule of thumb is: once you need more than 1 cubic yard (27 cubic feet), ready-mix becomes cost-competitive and far less labor-intensive. One cubic yard equals 45 bags of 80 lb concrete — mixing, carrying, and placing that volume by hand takes multiple people most of a day. A ready-mix truck can deliver that volume in minutes. Ready-mix is also more consistent because the entire batch is mixed at the plant under controlled conditions, whereas bags mixed in shifts can have water ratio variation between batches.
No — the yield of a concrete bag is a fixed volumetric property of the dry mix ratio and does not meaningfully change with temperature or altitude. What temperature does affect is working time and curing rate. In hot weather, concrete sets faster, giving you less time to work it; in cold weather, it sets slower and needs protection from freezing. At high altitude, air pressure doesn't affect concrete yield. The volume you get per bag remains consistent regardless of where you're working.
Very accurate — if you follow the water ratio on the bag. The 0.45 ft³ figure is the manufacturer-published yield for Quikrete and Sakrete 60 lb standard concrete mix at the specified water ratio (typically around 0.5 to 0.6 quarts per pound of mix). In practice, most people add slightly more water, which can reduce yield by 3–8%. For planning purposes, 0.45 ft³ per bag is the industry-standard figure and the one used by hardware stores, contractors, and ready-mix suppliers when converting between bags and yards.
Yes — mixing bag sizes is fine as long as they're the same mix type and brand. Standard concrete mix is standard concrete mix regardless of the bag weight. If you have leftover 60 lb bags and want to top up with 80 lb bags, that's perfectly acceptable. Just run separate calculations for each bag size in this converter and add the resulting volumes together. The concrete itself will be chemically identical regardless of which bag it came out of.
A 10×10 ft slab at 4 inches thick requires 33.33 cubic feet of concrete (10 × 10 × 0.333 ft). With a 10% waste factor, that's about 36.7 cubic feet. For 80 lb bags (0.60 ft³ each), you need approximately 62 bags. For 60 lb bags (0.45 ft³ each), about 82 bags. For 40 lb bags (0.30 ft³ each), about 123 bags. At those quantities, ordering ready-mix concrete is almost certainly more practical and cost-effective than mixing bags.
This converter starts with bags and tells you the resulting volume. The Cubic Yards to Bags converter works in reverse — you enter a volume (in yards) and it tells you how many bags you need. Use this tool when you already know the number of bags (e.g., you bought a certain number and want to know if it's enough, or you're comparing bagged vs. ready-mix costs). Use the other tool when you've calculated the volume your project requires and want to know the bag equivalent.
