Building stairs requires precise calculations to ensure safety and comfort. Our Stair Calculator helps you determine the number of steps, exact riser height, and total run based on your total rise. It also calculates the stringer length and stair angle, flagging any measurements that might fall outside standard building codes.
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Stair Calculator
Calculate rise, run, and stringer length
Stair Dimensions
Standard Code Limits (Reference)
Max Riser: 7.75 inches
Min Tread: 10 inches
Ideal Angle: 30° - 37°
*Always check your local building codes.
Stair Layout
Enter rise height to calculate steps
Calculate Stair Rise and Run
Calculate the perfect stair layout including number of steps, riser height, stringer length, and angle. Ensure your stairs meet building codes.
1
Measure Total Rise
Measure the vertical distance from the lower floor to the top of the upper floor.
2
Set Preferences
Enter your desired riser height (usually 7.5") and tread depth (10-11").
3
Review Layout
See the calculated number of steps, exact riser height, and total run.
Key Features
Step Count
Automatically calculate the optimal number of steps.
Precise Dimensions
Get exact measurements for rise, run, and stringer length.
Code Compliance
Visual indicators for standard riser heights and angles.
Frequently Asked Questions
Standard riser height is typically between 7 and 7.75 inches. Always check your local building codes.
The ideal angle for a standard staircase is between 30 and 37 degrees.
The stringer length is the hypotenuse of the right triangle formed by the total rise and total run.
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