5 solid concrete steps, 4 ft wide with 7-inch risers and 11-inch treads, take 32.1 cubic feet (1.19 cu yd). With 10% extra, buy 59 bags of 80 lb concrete. Total rise: 35 inches.
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Assumes solid steps resting on the ground. Footings and rebar are extra.
Your results
Concrete to buy (incl. waste)1.31 cu yd
80 lb bags59
60 lb bags79
Total rise / run35 in / 4.58 ft
Exact volume32.08 cu ft
Concrete for 5 steps by width
Width
Cubic yards (+10%)
80 lb bags
60 lb bags
3 ft wide
0.98
45
59
4 ft wide
1.31
59
79
5 ft wide
1.63
74
99
6 ft wide
1.96
89
118
The math
4 ft × (11 ÷ 12) × (7 ÷ 12) × 5×6/2 = 32.08 cu ft
× 1.10 ÷ 0.6 per bag = 59 bags
Common questions
How many bags of concrete for 5 steps?
59 bags of 80 lb concrete for 5 steps 4 ft wide with 7-inch risers and 11-inch treads, including 10% extra.
