Stair Rise and Run Calculator
Work out your stairs. Enter the total rise (floor to floor) and the going (tread depth), the calculator finds a step count that keeps the riser within the Building Code range and all risers equal.
How we estimate this
Stairs are set out from the total rise (floor to floor) divided into equal risers. The Building Code requires risers between 115mm and 190mm, a going (tread depth) of 240mm to 355mm, and 2×riser+going between 550 and 700mm for a comfortable step.
Pricing reviewed: November 2026.
Pricing reviewed November 2026. Indicative Australian costs, not a quote.
Understanding stair rise and runs in Australia
Stairs are set out from the total rise (floor to floor) divided into equal risers. The Building Code requires risers between 115mm and 190mm, a going (tread depth) of 240mm to 355mm, and 2×riser+going between 550 and 700mm for a comfortable step.
All risers in a flight must be equal, an uneven step is a trip hazard and a compliance fail. This calculator targets a comfortable riser and shows whether your going keeps the stair within code, but a builder or surveyor confirms the final set-out.
Frequently asked questions
What is the maximum stair riser height in Australia?
The Building Code sets risers between 115mm and 190mm, with a going (tread depth) of 240mm to 355mm. All risers in a flight must be equal, and 2×riser+going should sit between 550 and 700mm.
How do I work out the number of steps?
Divide the total floor-to-floor rise by a comfortable riser (around 175mm) and round to a whole number, then recalculate the exact riser. Enter your rise to see the step count.
Are you a builder / carpenter?
Everyone on this page is working out what stair rise and run costs because they are ready to hire. Put your business right beneath the calculator, in your state, so you are who they find. From $50/mo.