Free · Everyday · Construction

Stair Calculator

Estimate riser count, actual rise, tread run, staircase length, and stringer length.

  • Checked formula
  • Private in your browser
  • No signup
Calculator inputs

Enter your values

Result

Your calculation

Risers
15
7.2 in each
Treads
14
Total run
140 in
Stringer length
176.82 in
Comfort check
24.4 in for 2R + T

Confirm local building-code limits, headroom, landings, nosing, and structural requirements.

How to use this calculator

  1. Enter the values and choose the units that match your situation.
  2. Calculate to see the primary answer and useful conversions.
  3. Review the assumptions before using the result for a project or decision.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.