Stair Calculator

Plan the perfect stairs with precise measurements.

Staircase Dimensions

Number of Risers

14

Riser Height

7.71 inches

Number of Treads

13

Tread Depth

10.00 inches

Total Run

130.00 inches

Stringer Length

169.01 inches

Calculation Breakdown

Based on a total rise of 108.00 inches and standard building practices:

  • Number of Risers = Round(Total Rise / Ideal Riser Height) = Round(108.00 / 7.5) = 14
  • Actual Riser Height = Total Rise / Number of Risers = 108.00 / 14 = 7.71 inches
  • Total Run = (Number of Risers - 1) × Tread Depth = 13 × 10.00 = 130.00 inches
  • Stringer Length = √(Total Rise² + Total Run²) = √(108.00² + 130.00²) = 169.01 inches

Understanding Stair Calculations