Calculators - Estimators - Template Generators
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Ideal Rise
Possible Rises

Remove Colour for Printing

Display scale rule to print and directly measure dimensions (top diagram only)
Left click, release and drag in top diagram to measure at scale

Label Diagram
Email this Calculation Creates a link (below) to save or Email current calculation


Click slider to select then use
cursor keys to move
Calculated at:

(2 * Rise) + Run =

Total Rise must be greater than Headroom

Select 'Use Total Run' above to lock Total Run and adjust individual Runs, or 'Use Ideal Run' to adjust Total Run and Angle

Draw at stair angle Click Stringer diagrams to draw at stair angle or level
Running Stringer Points (up stringer)

Running Stringer Points (up stringer)

Min stringer throat depth Check local building regulations for minimum stringer throat depth.

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

Enter Total Rise of stairs, from lower floor to top of upper floor, allowing for floor coverings etc. Select Ideal Rise from drop-down. The number of rises and actual rise is calculated to fit closest to selected ideal rise.

After calculating and re-drawing stair plan diagram, a drop-down list of possible alternate rises is displayed. Select alternatives to re-calculate and display stair plan diagram. Add or subtract a single rise with the +Rise or -Rise buttons to re-calculate and re-draw stair diagram.

For concrete stairs, select Concrete Thickness and enter the throat thickness (see diagram) and Stair Width to calculate formwork dimensions and concrete volume. For wood stairs, select Stringer Width and enter the width of the stringer.

If using notched stringers, mark out running measurements along stringer, then mark a framing square as shown (or use Stair Gauges) to mark notch cut-outs. Or cut a template at the size shown and use to mark out notches along the stringer.

To calculate and display upper floor opening and stair headroom, enter upper floor thickness, check the Headroom check-box and select either the Headroom or Floor Opening radio button. Selecting 'Headroom' calculates upper floor opening from entered headroom. Selecting 'Floor Opening' calculates headroom from entered floor opening.
If your floor opening is unchangeable, select 'Floor Opening' and 'Use Total Run' to see if you can get an acceptable fit.

Uncheck Restrict to allow extreme stair dimensions. (eg: stairs on boats - pathway stairs on sloping ground etc)

Measure to Scale Check Scale Rule checkbox to display a ruler at the same scale as upper diagram. Print (100% printer scale), cut and use this scale rule to measure dimensions directly from diagram. (top diagram only)

Follow Local Building Regulations Be sure to follow local building regulations regarding all stair dimensions.

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Metric or Imperial
The main (larger) navigation menu tabs are for the Metric versions of calculators.
If there is an Imperial (Feet and Inches) version, under the main Metric tab will be a smaller Imperial tab.

Create PDF files to print diagrams on current page. Print large images over multiple pages Printing to Scale Help and Plan Printing.

Slider Controls To fine tune Slider Controls click to select and use (cursor) keyboard keys.

Use your iPad or Android Tablet On-Site Your iPhone or Android is a valuable On-Site tool!
Lay your device on an angled surface (roof ?) to directly measure angles and automatically calculate Roofing and Pitch Angle Apps.

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All calculators on this site are GEOMETRIC only. Check local regulations for sizes, spacings and all engineering requirements.

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