6 solid concrete steps, 4 ft wide with 7-inch risers and 11-inch treads, take 44.9 cubic feet (1.66 cu yd). With 10% extra, buy 83 bags of 80 lb concrete. Total rise: 42 inches.
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Assumes solid steps resting on the ground. Footings and rebar are extra.
Your results
Concrete to buy (incl. waste)1.83 cu yd
80 lb bags83
60 lb bags110
Total rise / run42 in / 5.5 ft
Exact volume44.92 cu ft
Concrete for 6 steps by width
Width
Cubic yards (+10%)
80 lb bags
60 lb bags
3 ft wide
1.37
62
83
4 ft wide
1.83
83
110
5 ft wide
2.29
103
138
6 ft wide
2.74
124
165
The math
4 ft × (11 ÷ 12) × (7 ÷ 12) × 6×7/2 = 44.92 cu ft
× 1.10 ÷ 0.6 per bag = 83 bags
Common questions
How many bags of concrete for 6 steps?
83 bags of 80 lb concrete for 6 steps 4 ft wide with 7-inch risers and 11-inch treads, including 10% extra.
