Determine Staircase Angle

What happens in this clip

To determine the angle of the stairs, run a string line from the nosing of the treads, allowing it to hang freely. You can use a normal string line or a chalk line. Once the string is in place, take your speed square and torpedo level. Line up the pivot point of the speed square with the string, ensuring the torpedo level shows that the square is perfectly level. Read the angle indicated on the speed square. In this instance, the angle was approximately 32 1/2 degrees. This angle represents the slope of the staircase, which is essential for accurately cutting the fascia board.

Goal: Find the precise angle of the staircase

What's used

Tools

• Speed Square Swanson Speed Square
• String Line
• Torpedo Level Empire

About the full video

This project provides detailed instructions on how to measure, cut, and install composite fascia boards to cover the exposed stringers of a staircase, ensuring a clean and finished look. It covers determining angles, making precise cuts, and proper attachment methods.

Step 3 of 3: Calculate the stair angle

With the total rise and total run values obtained, use the arctangent (or inverse tangent) function to calculate the angle of the staircase. The formula is: Angle = arctan(Total Rise / Total Run). You can use a scientific calculator or a spreadsheet program for this calculation. The result will be in degrees.

Open this step in the guide

Every video in How to Find the Angle of Your Stairs

1. Step 1: Measure the total rise of the staircase

   • 0:15–0:29 Measure Total Rise
   • 2:54–4:34 Determine the Total Rise
   • 0:01–0:28 Measure Total Vertical Rise

2. Step 2: Measure the total run of the staircase

   • 2:54–4:47 Measure Straight Stairs
   • 0:15–0:29 Measure Total Rise
   • 2:06–3:02 Measure Total Run

3. Step 3: Calculate the stair angle

   • 0:31–1:14 Retrieve Default Stair Parameters
   • 0:00–0:35 Understand and Calculate Stair Angles
   • 1:21–2:07 Determine Staircase Angle (this video)