How Many Bags of Concrete for a 8 Inch Sonotube?
A 8" tube filled 48" deep needs 3 bags of 80 lb concrete.
3bags
80 lb bags · estimated $20.94 at $6.98/bag
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Estimated cost: ~$20.94 (3 × $6.98/bag, Spring 2026 pricing)
Bag size
Multi-bag comparison
| Bag size | Bags | Price/bag | Total |
|---|---|---|---|
| 80 lbBest value | 3 | $6.98 | $20.94 |
| 60 lb | 4 | $5.98 | $23.92 |
| 40 lb | 6 | $4.98 | $29.88 |
Prices are spring 2026 estimates. Above ~60 bags, price a ready-mix truck too — it is often cheaper.
Material list
- 3 × 80 lb concrete mix bags — $20.94 @ $6.98/bag (Spring 2026)Home Depot ↗Lowe's ↗
- Wheelbarrow or mixing tub
- Mixing hoe or drill paddle
- Margin trowel or float
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3 bags(80 lb)
$20.94
How this is calculated
We convert your dimensions to cubic feet, add a 10% waste buffer for spillage and an uneven subgrade, then divide by the bag's yield and round up to the next full bag.
FAQ
How many bags of concrete for a 8 inch sonotube?
A 8-inch tube filled 48 inches deep needs about 3 bags of 80 lb or 4 bags of 60 lb concrete, including 10% waste.
How do I calculate concrete for a deeper or shallower tube?
Enter your depth in the calculator above and the bag count updates instantly. Concrete scales directly with depth.
How much concrete does a 8 inch sonotube hold?
About 1.4 cubic feet per 48 inches of depth for a 8-inch tube.
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← Back to Sonotube Concrete Calculator
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