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# Help With Math and Stairs

#1
02-04-08, 05:45 PM
Member
Join Date: Feb 2008
Posts: 1
Help With Math and Stairs

Does anyone know how to calculate how tall stairs need to be for a 125 inch tall wall? There has to be a way how to calculate this.

#2
02-04-08, 07:10 PM
Group Moderator
Join Date: Dec 2004
Posts: 26,235
You usually want stairs that are close to 7" each.

125 / 7 = 17.857 steps.

You aren't going to have a partial step so you either round up or down.

17 steps = 125 / 17 = 7.353" (roughly 7 3/8" each)

18 steps = 125 / 18 = 6.944" each (roughly 6 15/16" each)

If 11 1/4" treads are used, 17 steps (your stringer actually has 16 of them, with the upper floor being the last "step") would create 180" of run. 18 steps would create 191.25" of run (since the stringer would have 17 of them).

#3
02-08-08, 07:34 AM
Member
Join Date: Feb 2005
Location: USA
Posts: 336
You might want to Google "Stairs". There are some good and helpful websites. Stairs can be a little tricky. For example the first step on the stringer has to be reduced the thickness of the tread to keep all the risers the same dimension. It helps to make a drawing with dimensions before you start cutting wood.

#4
02-08-08, 03:29 PM
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Join Date: Dec 2005
Location: USA
Posts: 36,608