Free Tool
Concrete Bag Calculator
Figure out how many bags of concrete mix you need for small pours — posts, pads, repairs, and DIY projects.
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When to Use Bag Mix vs. Ready-Mix
Bag concrete (Quikrete, Sakrete, etc.) makes sense for small projects: fence posts, mailbox bases, small pads, and repair work. The general rule of thumb:
- Under 1/2 cubic yard (13.5 cu ft) — bag mix is practical and cost-effective
- 1/2 to 1 cubic yard — possible with bags but a lot of mixing; consider a small trailer load
- Over 1 cubic yard — order ready-mix from a concrete plant; bag mixing becomes impractical
Bag Coverage Reference
| Bag Size | Yield (cu ft) | Bags per CY | Typical Price |
|---|---|---|---|
| 40 lb | 0.30 cu ft | 90 bags | $3.50 – $5.00 |
| 60 lb | 0.45 cu ft | 60 bags | $4.50 – $6.50 |
| 80 lb | 0.60 cu ft | 45 bags | $5.50 – $8.00 |
Tips for Bag Concrete
- Buy 10% extra. Bag yields are approximate, and you'll lose some in mixing and placement.
- Don't add too much water. The mix should be thick and hold its shape — soupy concrete is weak concrete.
- Mix time matters. Mix each batch for at least 3-5 minutes for proper hydration.
- 80 lb bags are heavy. If you're mixing a lot by hand, 60 lb bags save your back. The cost per cubic foot is similar.
From small pours to full foundations
ConstructiveCore handles material estimation, cost tracking, and inventory management for concrete jobs of any size.