Concrete Steps Calculator
Calculate concrete volume in cubic feet, cubic yards, and 80 lb bags for steps and stairs. Includes side walls, footers, rebar, and form boards.
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Total Concrete (cubic feet)
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Total Concrete (cubic yards) —
80 lb Bags (with 10% extra) —
Extended More scenarios, charts & detailed breakdown ▾
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Concrete (cu ft)
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Concrete (cu yd) —
80 lb Bags —
60 lb Bags —
Total Tread Area (sq ft) —
Professional Full parameters & maximum detail ▾
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Concrete Volume
Steps Volume (cu ft) —
Side Walls Volume (cu ft) —
Footer Volume (cu ft)
Total Concrete (cu yd) —
80 lb Bags —
Materials
Rebar Estimate (linear ft) —
Form Boards (linear ft) —
Cost
Estimated Concrete Cost —
How to Use This Calculator
- Enter the number of steps.
- Enter the rise per step (default 7.5 in) and tread depth (default 11 in).
- Enter the stair width in feet.
- Results show total concrete volume and 80 lb bags needed.
Formula
Volume per step i = (i × rise_ft) × tread_ft × width_ft
Total volume = sum of all steps. Cubic yards = cubic feet ÷ 27. Bags (80 lb) = cubic feet ÷ 0.6 × 1.1
Example
Example: 4 steps, 7.5 in rise, 11 in tread, 4 ft wide → Total ≈ 3.06 cu ft = 0.11 cu yd ≈ 6 bags
Frequently Asked Questions
- Each step volume = (step number × rise height) × tread depth × stair width. Sum all steps together. The formula accounts for the stacking — step 1 is 1 rise tall, step 2 is 2 rises tall, etc.
- One 80 lb bag yields approximately 0.6 cubic feet of concrete. Divide total cubic feet by 0.6, then add 10% waste. The calculator shows this automatically.
- Building codes typically require rise (riser height) of 6–7.75 inches and tread depth of at least 11 inches. The standard combination is 7.5 inch rise / 11 inch tread.
- The stair calculator determines dimensions and code compliance (rise/run ratios). This concrete steps calculator calculates material volume — how much concrete to order or mix.
- Yes, most concrete steps require a footer (foundation) below the bottom step to prevent frost heave. The professional tier calculates footer volume separately.