How to Measure for Stairs

Beginner 5 min 8 steps 5906 views Rating: 3.6/5 Published: 2026-05-10

Measure the height, or "rise," of the space you want to make stairs.. Subtract 6–7 feet (1.8–2.1 m) from the total rise to account for headroom.. Divide the rise by 6 or 7 inches (15 or 18 cm) to find the total number of stairs.

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Steps

1

Measure the height, or "rise," of the space you want to make stairs.

Step 1

Measure the height, or "rise," of the space you want to make stairs.

2

Subtract 6–7 feet (1.8–2.1 m) from the total rise to account for headroom.

Step 2

Subtract 6–7 feet (1.8–2.1 m) from the total rise to account for headroom.

3

Divide the rise by 6 or 7 inches (15 or 18 cm) to find the total number of stair

Step 3

Divide the rise by 6 or 7 inches (15 or 18 cm) to find the total number of stairs.

4

Divide the rise by the number of stairs to find the individual stair rise.

Step 4

Divide the rise by the number of stairs to find the individual stair rise.

5

Plan for the individual "run" of each step to be 9–10 inches (23–25 cm).

Step 5

Plan for the individual "run" of each step to be 9–10 inches (23–25 cm).

6

Find the total run by multiplying the individual run by the number of steps.

Step 6

Find the total run by multiplying the individual run by the number of steps.

7

Plan for the width of each stair to be 36 inches (91 cm).

Step 7

Plan for the width of each stair to be 36 inches (91 cm).

8

Calculate your staircase's stringer length.

Step 8

Calculate your staircase's stringer length.

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