Stair Calculator

Use Stair Calculator | Accurate Stringer, Rise & Run Tool to free online stair calculator to compute rise, run, step height, tread depth, stringer length & stair angle. Accurate, code-compliant results in seconds.

Stair Calculator | Accurate Stringer, Rise & Run Tool is an alternative to manual workflows and disconnected tools, bringing the core experience into one focused product.

• 2 Input Target Step Height (F): Your preferred riser height.
• 3 Set Tread Thickness (C) & Tread Depth (B): Define the walking surface.
• 4 Select Mount Type: Standard or Flush stringer.
• 5 Click "Calculate": Instantly see the number of steps, stringer length, stair angle, and placement.
• Manual Calculator If you already know your Total Rise and Total Run, or want full control of riser count, the manual tool is perfect: 1 Enter Total Rise (A) and Total Run (G).