2 solid concrete steps, 4 ft wide with 7-inch risers and 11-inch treads, take 6.4 cubic feet (0.24 cu yd). With 10% extra, buy 12 bags of 80 lb concrete. Total rise: 14 inches.
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Assumes solid steps resting on the ground. Footings and rebar are extra.
Your results
Concrete to buy (incl. waste)0.26 cu yd
80 lb bags12
60 lb bags16
Total rise / run14 in / 1.83 ft
Exact volume6.42 cu ft
Concrete for 2 steps by width
Width
Cubic yards (+10%)
80 lb bags
60 lb bags
3 ft wide
0.2
9
12
4 ft wide
0.26
12
16
5 ft wide
0.33
15
20
6 ft wide
0.39
18
24
The math
4 ft × (11 ÷ 12) × (7 ÷ 12) × 2×3/2 = 6.42 cu ft
× 1.10 ÷ 0.6 per bag = 12 bags
Common questions
How many bags of concrete for 2 steps?
12 bags of 80 lb concrete for 2 steps 4 ft wide with 7-inch risers and 11-inch treads, including 10% extra.
