4 solid concrete steps, 4 ft wide with 7-inch risers and 11-inch treads, take 21.4 cubic feet (0.79 cu yd). With 10% extra, buy 40 bags of 80 lb concrete. Total rise: 28 inches.
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Assumes solid steps resting on the ground. Footings and rebar are extra.
Your results
Concrete to buy (incl. waste)0.87 cu yd
80 lb bags40
60 lb bags53
Total rise / run28 in / 3.67 ft
Exact volume21.39 cu ft
Concrete for 4 steps by width
Width
Cubic yards (+10%)
80 lb bags
60 lb bags
3 ft wide
0.65
30
40
4 ft wide
0.87
40
53
5 ft wide
1.09
50
66
6 ft wide
1.31
59
79
The math
4 ft × (11 ÷ 12) × (7 ÷ 12) × 4×5/2 = 21.39 cu ft
× 1.10 ÷ 0.6 per bag = 40 bags
Common questions
How many bags of concrete for 4 steps?
40 bags of 80 lb concrete for 4 steps 4 ft wide with 7-inch risers and 11-inch treads, including 10% extra.
