Stair Calculator
Rise, run and number of steps for a code-compliant staircase.
cm
cm
cm
Number of steps
16
Riser height
17.5cm
Tread depth
21.88cm
Staircase angle
38.7°
2R + T (aim ~63)
56.9cm
ShowHide the working
- 1Steps = round(280 ÷ 18) = 16
- 2Riser = 280 ÷ 16 = 17.5 cm
Formula
steps = round(rise ÷ target riser)How it works
Divides the floor-to-floor rise into equal risers and checks the result against the 2×riser + tread comfort rule (~63 cm).
Example
A 280 cm rise with an 18 cm target gives 16 steps of 17.5 cm.
Building codes cap riser height and set minimum tread depths. Check your local regulations before building.
About the Stair Calculator
Rise, run and number of steps for a code-compliant staircase. It sits in the Home & Construction section of NWS Calc, a free collection of calculators that run entirely in your browser. There is no signup, no paywall and no tracking — open the page, enter your numbers, get an answer.
Frequently asked questions
- Is the Stair Calculator free to use?
- Yes. Every calculator on NWS Calc is completely free, with no signup, no usage limits and no ads.
- Does my data leave my device?
- No. The Stair Calculator runs entirely in your browser using JavaScript. Nothing you type is uploaded, logged or stored on a server.
- Can I use the Stair Calculator on my phone?
- Yes. The page is fully responsive and works in any modern mobile or desktop browser — there is nothing to install.
- What else is in Home & Construction?
- Paint, tile, concrete, flooring, lumber and material estimates. You can browse the full Home & Construction category for related calculators.