Concrete Steps Calculator
Calculate concrete volume needed for concrete steps and stairways.
Formula & Explanation
Concrete steps are calculated by summing the volume of each individual step, treated as a rectangular prism: Volume per Step (cu ft) = (Rise × Run × Width) / 144 Where rise and run are in inches and width is in feet. The denominator 144 converts (inches² × feet) to cubic feet. Total Volume = Volume per Step × Number of Steps To convert to cubic yards, divide by 27. A waste percentage (typically 10%) is added for spillage and material loss. Final bags = ceil(Total Volume × (1 + Waste%) ÷ Bag Yield)
Assumptions
- •Each step is a uniform rectangular prism (simplified model)
- •Rise and run are entered in inches; width in feet
- •The calculation assumes open-riser stairs (no stringers filling side gaps)
- •All steps have identical dimensions
- •Bag yield values are industry standards-confirm with your product
- •A 10% waste allowance is typical for steps; use 15% for complex landing details
Example Calculation
Three concrete steps, each 7 inches high and 11 inches deep, spanning 3 feet wide, require 4.81 cubic feet of concrete. With 10% waste and 60 lb bags, you need 13 bags.
Inputs
Results
Common Step Configurations & Concrete Volume
| steps | volume_cuft | volume_cuyd | bags_60lb |
|---|---|---|---|
| 3 steps, 7"H × 11"D, 3ft wide | 4.81 | 0.18 | 13 |
| 4 steps, 7"H × 11"D, 3ft wide | 6.42 | 0.24 | 18 |
| 5 steps, 7"H × 11"D, 4ft wide | 10.14 | 0.38 | 28 |
| 6 steps, 8"H × 10"D, 4ft wide | 13.33 | 0.49 | 37 |
| 8 steps, 7"H × 11"D, 4ft wide | 16.23 | 0.60 | 45 |
Frequently Asked Questions
Related Calculators
Concrete Slab Calculator
Calculate concrete volume and bag requirements for rectangular slabs, patios, and floor pours.
Stair Calculator
Calculate the number of risers, tread depth, and stringer length for a complete staircase layout.
Concrete Bag Calculator
Calculate how many bags of concrete are needed for a given volume.
Rebar Calculator
Calculate linear feet and weight of rebar reinforcement for concrete slabs, walls, and foundations.