Uso Diario

Stair Calculator

Calculate stair stringer length, tread depth, and riser height for construction projects.

Total Rise (Height from lower floor to upper floor)

Target Riser Height (Step Height)

Standard code is around 7" to 7.5" (17.8 - 19cm).

Target Tread Depth (Step Depth)

Standard code is around 10" to 11" (25 - 28cm).

Mounting Style

Standard (Flush) Dropped Stringer

Number of Stairs

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Actual Riser Height

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Actual Tread Depth

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Total Run (Length)

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Stringer Length

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Stair Angle

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Headroom Clearance Check

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Cómo Usar

Measure the Total Rise (the exact vertical distance between the two floors).
Enter your Target Riser Height (how tall you want each step to be). The calculator will find the closest mathematically possible even step height.
Enter your Target Tread Depth (how deep you want each step to be).
Review the exact measurements needed to cut your stringers and build safe stairs.

Fórmula

Stair Math:
Number of Risers = Total Rise / Target Riser Height (Rounded to nearest whole number)
Actual Riser = Total Rise / Number of Risers
Number of Treads = Number of Risers - 1 (for standard mount)
Total Run = Number of Treads * Actual Tread
Stringer Length = √(Total Rise² + Total Run²)
Angle = arctan(Actual Riser / Actual Tread)