Help With Math and Stairs


Old 02-04-08, 05:45 PM
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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.
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Old 02-04-08, 07:10 PM
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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).
Old 02-08-08, 07:34 AM
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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.
Old 02-08-08, 03:29 PM
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