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Stair Calculator with Detailed Plan Diagrams

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Top Tread is 1 Rise down from upper floor.
Select and see stringer top position in diagram.

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Top Tread is Level with, and protrudes from upper floor.
Select and see stringer top position in diagram.

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From Finished Lower Floor Level to Finished Upper Floor Level
Total Rise
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Ideal Rise is the rise you'd prefer.
Actual Rise is calculated so that all rises fit evenly into Total Rise, at nearest to Ideal Rise.
Ideal Rise
Possible Rises


Stair Width

Head-room
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Total Floor Thickness - including joist, boards linings etc. This is used to calculate Headroom, so must be from top of upper floor (Total Rise) to underside of finished floor.
Floor Thickness
Tread Thickness  
Riser Thickness
Nosing

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Calculate baluster spacing and position on treads.
Tread Thickness, Riser Thickness and Nosing must be larger than 0. See lower diagram.
View
Baluster Width
Balusters / Tread

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Restrict extreme measurements, angles etc
Label Diagram

Share Calculation

Measure at full scale Click - Release
and Drag in diagram to measure at full scale.

Scale Display Units

Head-room


Stair Calculator rise run stringer and head-room plan diagram with full dimensions


light globe Mark, cut, and test 1 stringer in place, then use it as a template to mark the rest.

Stair Calculator - housed stringer diagram with full dimensions
Running Stringer Points (up stringer)
Mark-out
Stair Calculator - notched Stringer diagram with full dimensions
Running Stringer Points (up stringer)
Mark-out

Running Measurements Vertically - Lower Floor to top of each tread
(Possible landing heights - Blue = middle)





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To calculate and display upper floor opening and stair head-room, enter upper floor thickness, check the Show Head-room check-box and drag the Head slider to calculate and animate diagram head-room and floor opening.
For concrete stairs, select Concrete Thickness and enter the throat thickness (see diagram) and Stair Width to calculate formwork dimensions and concrete volume. For wooden stairs, select Stringer Width and enter the width of the stringer.


Example of Projects Completed

Hi there. I just wanted to let you know that I found your stair calculator incredibly useful.
My wife and I designed and built a set of stairs for my parents, as their existing stairs were not up to code, and had been badly built.

In any event, this was our first set of stairs that we’ve ever built and it’s no easy task for a first timer. I found it so useful to be able to tinker around with potential ideal rises and runs, tread thickness, riser, thicknesses, and nosings and see how it would impact our final product.

The end result was honestly fantastic. The stairs are about 1 million times more sturdy than the pre-existing ones and my parents are so incredibly impressed and grateful.
I’ve attached some pictures of the project and the final result!

Thank you!
Marking out Stair Stringers
Cutting Stair Stringers Stringers in Pplace Finished Stair Project


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Actual physical finished sizes All Inch inputs and dimensions are actual physical finished sizes (unless otherwise noted)
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Select output Fraction Precision, Decimal Inch or Metric mm.
Select and Re-Calculate to display.
Fraction Precision
Lumber Sizes


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