How do you measure a staircase?

Use this easy guide and calculator to ensure accuracy when measuring for a new stair railing system. To properly measure a staircase, you’ll need to measure the tread rise, the tread run, the tread thickness, and the nose projections. By using this process then checking your math with the Keuka Studios Stair Calculator, you can be assured of a proper fit. Following this guide is simple, however, you do want to be accurate. Try to measure within a 1/6 of an inch for best results.

### Step 1: Measure the Tread Rise

Use a framing square and a ruler or straightedge to determine the exact height of each tread rise. The ruler will help you see the exact number on the framing square. Enter this number in the field labeled (D) in the calculator.

### Step 2: Count the Number of Rises

Simply enter the number of rises from your staircase into the field labeled (H) in the Stair Calculator. Hint: Count the tread noses to determine the number of rises.

### Step 3: Measure the Tread Run

Using a framing square and combination square, determine the exact nose-to-nose tread run of each tread. The combination square is used to line up the numbers accurately on the framing square. Enter this number in the field labeled (C) in the calculator.

### Step 4: Measure the Tread Thickness

Enter the thickness of the treads in the field labeled (E) in the stair calculator.

### Step 5: Measure the Nose Projections

To determine the length of the nose projections, measure from the edge of the tread to where it meets the verticle riser. For reference, see (I) in the diagram below.

### Step 6: Calculate the Stair Angle and Double-Check Your Dimensions

Use our Stair Calculator tool to calculate the stair angle and some additional dimensions that you can use to double-check your math. Simply enter the values you recorded in steps 1-5 and hit “Calculate” to arrive at these numbers.

### Step 7: Check Your Measurements

This is the most important step. Go back and check the numbers that the calculator returned for the overall rise, run, and stair angle. If you measured the stairs accurately, these measurements should be pretty close to the results produced by the Stair Calculator.

# Keuka Studios Stair Calculator

Use this calculator tool to check your measurements when measuring an existing stair for a new railing.

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