Enter your Step Length, Step Width, Riser Height, Number of Steps, Landing Depth/Thickness, and Waste Factor into the Concrete Steps Calculator to get Total Concrete Volume broken down into Steps Volume, Landing Volume, and a final cubic yards figure for ordering.
Total Concrete Volume
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Total Volume (Cubic Yards)
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Steps Volume Only
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Landing Volume
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80lb Concrete Bags Needed
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The basic formula is: Step Volume = (Tread Run × Riser Height ÷ 2) × Step Width × Number of Steps. This calculates the triangular volume of each step and multiplies by the total number of steps.
Measure the tread run (depth), riser height, and step width. Each step forms a triangular prism, so calculate the area of the triangle (run × height ÷ 2) and multiply by width and number of steps.
Yes, concrete stairs typically require rebar reinforcement, especially for spans over 4 feet wide or more than 3 steps high. Check local building codes for specific requirements in your area.
Residential stairs are typically 36-48 inches wide, while commercial stairs are usually 44-48 inches minimum. The width depends on building codes and intended use.
Add 10-15% extra concrete to account for waste, spillage, and minor measurement variations. Complex stairs or first-time builders may want to add up to 20%.
Standard riser height is 6-8 inches, with 7-7.5 inches being most common. Tread depth should be 10-12 inches minimum for safety and comfort.
Each 80-pound bag yields about 0.6 cubic feet of concrete. Divide your total cubic footage by 0.6 to determine the number of bags needed, then add your waste factor.
Yes, if your stairs have a landing platform at the top or bottom, include its dimensions. Landings are typically 3-4 inches thick and should be at least as deep as the stair width.