Calculate stringer layout steps, equal heights, and total horizontal run distance based on total vertical deck or floor heights.
1. Stair Parameters
Enter your total floor-to-floor vertical rise height and target step properties to map out the stair profile.
Number of Risers / Treads
9 Risers / 8 Treads
Exact Riser Height
7.11 in
Total Horizontal Run
84.00 in
Stringer Angle
34.1°
How to Calculate Stair Stringers
Stair stringer layout math divides a non-adjustable vertical space into uniform stepping increments. To find the required count, divide the absolute floor-to-floor rise height by your target single riser size (commonly 7 inches per modern building code). Round this step count up or down to the nearest whole integer, then divide the total height again by that whole number to arrive at the exact single riser height layout property.
Disclaimer: This tool is provided for educational and informational tracking purposes only. Calculations use standard structural mathematics. Local municipality residential and commercial building codes vary widely regarding maximum riser heights, minimum tread paths, nosing extensions, and headroom clearances. All calculated specifications must be cross-checked manually against native code requirements before laying out or cutting dimensional lumber stringers. The website owner assumes no liability.