How much concrete for a 10-inch Sonotube or round footing?

A 10-inch Sonotube 4 ft deep holds 2.18 cubic feet of concrete. With 10% extra, buy 4 bags of 80 lb (or 6 bags of 60 lb). Every foot of depth adds 0.55 cu ft.

Change the numbers

The calculator below is pre-filled for this project. Adjust any value — including feet and inches — and the results update instantly.

Tip: enter feet and inches in separate boxes, or use decimals (10 ft 6 in = 10.5 ft).

Your results

Concrete to buy (incl. 10% extra)0.09 cu yd

80 lb bags4

60 lb bags6

40 lb bags8

Exact volume2.18 cu ft (0.08 cu yd)

How much concrete for a 10-inch Sonotube or round footing — diagram

Concrete for one 10-inch tube by depth

Quantities include 10% extra. Multiply by the number of piers.

Depth	Cu ft (+10%)	80 lb bags	60 lb bags	40 lb bags
2 ft	1.2	2	3	4
3 ft	1.8	3	4	6
4 ft	2.4	4	6	8
5 ft	3	5	7	10
6 ft	3.6	6	8	12

Planning piers and footings

Footings for decks and porches must go below your local frost line and follow the pier size on your plans. Set the tube on undisturbed soil or a footing pad, keep it plumb and fill in lifts, rodding out air pockets as you go.

The math

π × (10 in ÷ 2 ÷ 12)² × 4 ft = 2.182 cu ft × 1.10 ÷ 0.6 cu ft per 80 lb bag = 4 bags

Common questions

How many bags of concrete for a 10 inch Sonotube?

4 bags of 80 lb concrete for a tube 4 ft deep, including 10% extra.

Want the full method, tips and other sizes? See the concrete calculator guide.

Last reviewed November 1, 2026. Results are estimates — confirm with your supplier.

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