Concrete Stairs Calculator

Estimate the concrete to pour a solid set of stairs.

How the Math Works

The Concrete Stairs Calculator uses a simplified geometric formula to estimate concrete volume: volume equals one-half multiplied by total rise, total run, and width. This formula treats the stair flight as a rectangular prism with a triangular cross-section, where the total rise represents the height and total run represents the depth. The factor of one-half accounts for the triangular shape, making the calculation both accurate for practical purposes and straightforward to apply without complex engineering math.

Practical Applications

To use this calculator, first measure the total vertical height you need to climb (total rise) and the total horizontal distance from the landing to the bottom (total run). Determine the width of your stairs, typically ranging from 36 to 48 inches for residential applications. Multiply these three measurements together and divide by two to find the volume in cubic feet, then convert to cubic yards by dividing by 27 for ordering concrete.

Day-to-Day Use

This calculation is essential when planning any concrete staircase project, whether for a home entryway, deck, or basement conversion. By knowing exactly how much concrete to order, you avoid costly over-orders that create excess waste or under-orders that delay construction. The calculator helps homeowners and contractors budget accurately, schedule deliveries properly, and ensure the structural integrity of their stairs from the very first pour.

Worked example

5 steps (7 in rise, 11 in run), 4 ft wide → ~5.3 ft³.

FAQ