L-shaped stairs

Each side of the landing is the same as the stairway's width, so it is as wide in both dimensions.

The two flights share one riser height and split the total rise between them, so the step height matches on both runs.

At a single landing, the turn in an L-shaped stairway is roughly a right angle. A U-shaped stairway makes a full switchback, and the site has a separate U-shaped stair calculator for that layout.

An L-shaped staircase is also called a quarter-turn stair. It is a stair with two flights that meet at a landing, where the stair turns 90 degrees.

The space needed for L-shaped stairs is the run of each flight plus the landing. For each arm, the run is the number of treads multiplied by the tread depth. The landing is a square whose sides are the same as the stair width. The calculator reports both flights' runs from the rise, riser cap and tread you enter.

To make an L-shaped stair, start with the layout numbers. Divide the total rise by the 7.75 inch riser cap and round up to get the riser count. Both flights share that riser height, and they meet at a 90 degree landing whose sides equal the stair width. Enter your rise, tread and width in the DIY Totals L-shaped stair calculator to get the riser count and run for both flights. Forming and building the stair is a separate construction job beyond the calculation.