Step 2 · Determine Baluster Length

Once the stair slope angle is determined, you can calculate the required length of each baluster. Measure the vertical distance from the top of the tread or the riser to the underside of the handrail. Subtract the space needed for the baluster shoe or mounting bracket from this measurement. For angled cuts, the length will be the hypotenuse of a right triangle where one leg is the vertical rise and the other leg is the horizontal run, adjusted by the angle of the handrail. Alternatively, hold a tape measure vertically from the tread/riser to the handrail, then pivot it to match the handrail's angle and read the length. Ensure this calculation accounts for any bottom connectors or shoes.