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60lb vs 80lb Concrete Bags: Which Should You Buy?
· 2 min read
The Two Standard Sizes
When you walk into Home Depot or Lowe’s, you’ll find two main concrete bag sizes on the shelf: 60lb and 80lb. Both contain the same mix (Portland cement, sand, and gravel), just in different quantities.
Quick Comparison
| Feature | 60 lb Bag | 80 lb Bag |
|---|---|---|
| Yield | 0.45 cu ft | 0.60 cu ft |
| Typical Price | $5.50–$7.00 | $7.00–$9.00 |
| Cost per cu ft | ~$13.33 | ~$13.33 |
| Weight | Manageable | Heavy |
| Water needed | ~2.8 quarts | ~3.8 quarts |
When to Choose 60lb Bags
- Small projects — fence posts, mailbox bases, small repairs
- Working alone — easier to lift and pour
- Tight spaces — easier to maneuver
- If you have back issues — 20 fewer pounds per lift adds up
When to Choose 80lb Bags
- Large projects — slabs, patios, driveways
- Fewer trips — need fewer total bags
- Cost efficiency — often slightly cheaper per cubic foot
- Working with a helper — sharing the load makes 80lb manageable
The Math on Larger Projects
For a 10×10 slab at 4 inches thick (about 37 cu ft with waste):
- 60lb bags: 82 bags needed
- 80lb bags: 62 bags needed
That’s 20 fewer bags to open, mix, and pour. For big projects, 80lb bags save significant time.
Our Recommendation
- Under 5 cubic feet: use 60lb bags
- Over 5 cubic feet: use 80lb bags (or consider ready-mix delivery for 1+ cubic yards)
Calculate Your Exact Count
Use our concrete bag calculator to instantly see how many bags of each size you need for your specific project dimensions.