Stair Calculator: Calculate Rise, Run, Stringer Length & Steps

Calculate Your Staircase Dimensions

Please enter the total vertical rise.
Inches cm
Typically 7.75 inches (19.7 cm) max for residential.
Please enter the maximum allowed riser height.
Inches cm
Typically 10 inches (25.4 cm) min for residential.
Please enter the minimum allowed tread depth.

Calculation Results

Number of Risers:

Actual Riser Height: inchescm

Number of Treads:

Actual Tread Depth: inchescm

Total Run: inchescm

Stringer Length: inchescm

Stair Angle: °

Note: Always consult local building codes before construction.

Use our free Stair Calculator to quickly determine crucial staircase dimensions. Easily calculate the optimal rise, run, stringer length, and total number of steps for your project, ensuring safety and compliance. Design your perfect stairs with precision.

Formula:

Number of Risers (NR) = Ceiling(Total Rise / Max Riser Height)
Actual Riser Height (AR) = Total Rise / Number of Risers
Number of Treads (NT) = Number of Risers - 1
Total Run (TRun) = Number of Treads × Min Tread Depth
Stringer Length (SL) = √((Total Rise)2 + (Total Run)2)
Stair Angle (SA) = atan(Total Rise / Total Run)

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