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Stairs Calculator

floor to floor

Result

Number of Risers15
Actual Riser Height7.200 in
Recommended Tread Depth10.70 in
Total Run13.38 ft
↗ Construction

Stairs Calculator Calculate the number of steps, riser height, and tread depth for a staircase. — free online calculator.

Formula

Steps = round(total rise / riser); Tread ≈ 17.9 − riser
  • Stairs Calculator calculates its result from Total Rise (floor to floor), Desired Riser Height. It uses the formula Steps = round(total rise / riser); Tread ≈ 17.9 − riser. Change any input to recalculate the result instantly.
  • The main inputs are Total Rise, Desired Riser Height. Enter them in the units and format shown in the calculator.
  • Keep measurements and project assumptions consistent before comparing or combining values.
  • Changing any input above recalculates the result with the same calculation engine used by this page.

Example: Stairs

Inputs
  • Total Rise: 108 floor to floor
  • Desired Riser Height: 7

Using Total Rise (floor to floor) = 108, Desired Riser Height = 7, the calculated result is 7.

Sample result: Calculating…

Frequently asked questions

What does the Stairs calculate?

Stairs Calculator Calculate the number of steps, riser height, and tread depth for a staircase. — free online calculator.

Which values should I enter?

Enter Total Rise, Desired Riser Height using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: Steps = round(total rise / riser); Tread ≈ 17.9 − riser.

Why might my result differ from another source?

Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.

Does the result update automatically?

Yes. Changing an input updates the result using the same calculation engine shown on this page.

Page information

Updated: October 10, 2026