Concrete Steps Calculator
Four steps, 7 inch rise and 11 inch run, 4 feet wide, plus a full-height 4 foot landing, need 2.17 cubic yards and 98 bags of 80 lb concrete.
Last updated . Each step is a full block from grade, and the landing is full height. Weight starts at 2,400 kg/m³. An 80 lb bag yields 0.60 ft³. No prices.
Enter the number of risers, the riser, the tread, the width, and a landing depth if the top landing is part of the pour.
A flat pad is the slab calculator. Bag yields are the bag calculator. A rectangular pour with no steps is the concrete calculator.
Concrete steps
Full height, from grade to the top of the stairs. Use 0 if there is no landing. Do not also count that landing as a tread.
Each step is a solid block from grade. The landing is full height. Weight uses 2400 kg/m³. No price.
Results
How the steps are counted
Total rise is the number of risers times the riser height. Total run is the same count times the tread. Each step is a full block from grade, so the flight is width × rise × run × n(n+1)/2. Four risers at 7 inches and four treads at 11 inches, 48 inches wide, use the factor 10: 48 × 11 × 7 × 10 = 36,960 cubic inches, 21.39 cubic feet.
The landing is width × landing depth × total rise, the full height of the stair. A 4 foot landing at a 28 inch rise is 48 × 48 × 28 = 64,512 cubic inches, 37.33 cubic feet. Together they are 58.72 cubic feet, 2.17 cubic yards. A triangle of the same outline is 17.11 cubic feet and is not used, because it under-orders solid steps on grade. If the top of the stair is that landing, leave it out of the tread count. A landing depth of 0 leaves the landing out.
Worked example
Leave every field as it opens: 4 steps, width 4 ft, riser 7 in, tread 11 in, landing depth 4 ft, bag 80 lb. Total rise reads 28.00 in · 2.33 ft. Total run reads 44.00 in · 3.67 ft. Flight reads 0.79 yd³ · 21.39 ft³ · 0.61 m³. Landing reads 1.38 yd³ · 37.33 ft³ · 1.06 m³. Total reads 2.17 yd³ · 58.72 ft³ · 1.66 m³. Weight reads 3.99 tonnes · 4.40 short tons. Bags read 98.
The same open values, split into the flight, the full-height landing, and the combined pour. Bag counts use 0.60 ft³ per 80 lb bag and round up.
| Part | Volume | Weight | 80 lb bags |
|---|---|---|---|
| Flight | 0.79 yd³ · 21.39 ft³ · 0.61 m³ | 1.45 tonnes · 1.60 short tons | 36 |
| Landing, 4 ft deep | 1.38 yd³ · 37.33 ft³ · 1.06 m³ | 2.54 tonnes · 2.80 short tons | 63 |
| Together | 2.17 yd³ · 58.72 ft³ · 1.66 m³ | 3.99 tonnes · 4.40 short tons | 98 |
Ordering the flight and the landing as two separate 80 lb orders is 36 + 63 = 99 bags. The combined pour is 98, because the two remainders share one extra bag. A 60 lb bag at 0.45 ft³ is 131 bags for the same 58.72 cubic feet.
Frequently asked questions
How much concrete do these steps need?
Leave 4 steps, a 7 inch riser, an 11 inch tread, a 4 ft width, and a landing 4 ft deep. The total reads 2.17 yd³, 58.72 ft³, and 1.66 m³. Weight is 3.99 tonnes and 4.40 short tons at 2,400 kg/m³. Bags read 98 of the 80 lb mix.
How is the flight volume counted?
Four risers of 7 inches are 28.00 inches, 2.33 feet. Four treads of 11 inches are 44.00 inches, 3.67 feet. Each step is a full block from grade, so the flight is width × rise × run × n(n+1)/2. For 4 steps that factor is 10: 48 × 11 × 7 × 10 = 36,960 in³, which is 0.79 yd³, 21.39 ft³, and 0.61 m³. A triangle of width × total rise × total run ÷ 2 would be 17.11 ft³ and would under-order this stair by 25%.
How much concrete is the landing?
The landing uses the same 4 ft width, a 4 ft depth, and the full 28 inch rise. 48 × 48 × 28 = 64,512 in³, which is 1.38 yd³, 37.33 ft³, and 1.06 m³. It is added to the flight. Set the landing depth to 0 and that block drops out.
What if there is no landing?
Set the landing depth to 0. The landing line reads 0.00 yd³. The total matches the flight: 0.79 yd³, 21.39 ft³, and 0.61 m³. Bags drop from 98 to 36 of the 80 lb mix. The rise and the run stay 2.33 ft and 3.67 ft.
How many bags is the flight plus the landing?
At 0.60 ft³ per 80 lb bag, 58.72 ft³ rounds up to 98 bags. A 60 lb bag at 0.45 ft³ is 131 bags. The flight alone is 36 bags of 80 lb mix and the landing alone is 63. Ordering those two pieces separately is 99 bags, one more than the combined pour of 98, because each piece is rounded up.
Should the top landing be a tread and a landing?
No. Each step in the count has one tread, and the landing is extra. If the top landing is that block, do not also count it as a tread or that concrete is in the order twice. The note under the landing depth says the same thing.
Does this set a legal riser or tread?
No. Seven inches and 11 inches are the numbers in the example, not a code maximum or minimum. Local rules set the rise, the run, and the landing. This page only turns the sizes you enter into volume for solid steps poured on grade. A flat slab that is not a stair is the slab calculator.