# Concrete stairs

This online calculator is designed to calculate the concrete volume of the material for the concrete yardage stair.

## Calculator

## Formula

c =((((n × t/12.0)×(n×r/12.0))/2)+((n×(t/12.0×r/12.0))/2))×w × 0.037037

- c - concrete Yardage
- n - number of stairs
- t - tread (inch)
- r - riser (inch)
- w - width (ft)

**Note**. This statistical calculator for the concrete volume for the concrete yardage stair is provided for your personal use and should be used as a guide only. Construction and other decisions should NOT be based on the results of this calculator. Although this calculator has been tested, we cannot guarantee the accuracy of its calculations or results.