Enter the total staircase run (ft) and the total number of stairs into the Stair Length Calculator. The calculator will evaluate the Stair Length. 

Stair Length Formula

The following two example problems outline the steps and information needed to calculate the Stair Length.

SL = SR / S
  • Where SL is the Stair Length (ft)
  • SR is the total staircase run (ft) 
  • #S is the total number of stairs 

To calculate the stair length, divide the staircase run by the number of stairs.

How to Calculate Stair Length?

The following example problems outline how to calculate Stair Length.

Example Problem #1:

  1. First, determine the total staircase run (ft).
    • The total staircase run (ft) is given as: 50.
  2. Next, determine the total number of stairs.
    • The total number of stairs is provided as: 20.
  3. Finally, calculate the Stair Length using the equation above: 

SL = SR / #S

The values provided above are inserted into the equation below and computed.

SL = 50 / 20 = 2.5 (ft)

Example Problem #2: 

For this problem, the variables required are provided below:

total staircase run (ft) = 60

total number of stairs = 30

Test your knowledge using the equation and check your answer with the calculator..

SL = SR / #S = ?