3 solid concrete steps, 4 ft wide with 7-inch risers and 11-inch treads, take 12.8 cubic feet (0.48 cu yd). With 10% extra, buy 24 bags of 80 lb concrete. Total rise: 21 inches.
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Assumes solid steps resting on the ground. Footings and rebar are extra.
Your results
Concrete to buy (incl. waste)0.52 cu yd
80 lb bags24
60 lb bags32
Total rise / run21 in / 2.75 ft
Exact volume12.83 cu ft
Concrete for 3 steps by width
Width
Cubic yards (+10%)
80 lb bags
60 lb bags
3 ft wide
0.39
18
24
4 ft wide
0.52
24
32
5 ft wide
0.65
30
40
6 ft wide
0.78
36
48
The math
4 ft × (11 ÷ 12) × (7 ÷ 12) × 3×4/2 = 12.83 cu ft
× 1.10 ÷ 0.6 per bag = 24 bags
Common questions
How many bags of concrete for 3 steps?
24 bags of 80 lb concrete for 3 steps 4 ft wide with 7-inch risers and 11-inch treads, including 10% extra.
