Number of steps, riser height, tread depth and total run for a comfortable, safe staircase.
How this works
Risers = floor height / target riser, rounded up. Comfort rule: 2 x riser + going = 600 to 650 mm (we aim for 625). Good risers are 150 to 190 mm, goings 250 to 300 mm, and the pitch should stay under 42°.
Questions people ask
How do I use the Staircase Calculator?
Fill in the fields, starting with “Floor to floor height”, “Target riser height” and “Stair layout”, and change any other options that match your home. The answer, a drawing and practical tips update as you type, and the Copy link button saves your numbers in a link you can share.
Is the Staircase Calculator free?
Yes. The Staircase Calculator is free, with no sign-up, and works on phones, tablets and computers. The results are estimates to help you plan, so check with a qualified professional before structural, electrical, gas or plumbing work.