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Free stair stringer calculator for construction projects. Calculate stair stringer length, cutting angles, tread depth, and riser height with professional accuracy. Our calculator provides precise measurements for safe and code-compliant stair construction.
Last updated: February 2, 2026
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Number of Steps
13
Stringer Length
153.67"
Stringer Angle
38.7°
Material (Board Feet)
36.02
Recommendation
Good stair proportions. Stringer design meets safety and comfort standards.
Construction
Cut & Notched
Most common type, requires precise cutting for tread and riser notches
Construction
Solid Board
Simpler construction, treads and risers attached to the top surface
Construction
Solid Pour
Durable option for outdoor or commercial applications
Construction
Precision Cut
Custom-cut for specific dimensions and design requirements
For a 96" rise and 120" run with 7.5" riser height:
Stringer Length
153.67"
Stringer Angle
38.7°
Our stair stringer calculator uses geometric principles and building code requirements to provide accurate measurements for stair construction. The calculation considers rise, run, tread depth, and riser heightto determine the optimal stringer dimensions and cutting angles for safe, code-compliant stairs.
Stringer Length = √(Rise² + Run²)Stringer Angle = arctan(Rise ÷ Run)Number of Steps = Rise ÷ Riser HeightMaterial Length = Stringer Length + 12" (waste)This formula uses the Pythagorean theorem to calculate the actual stringer length needed, determines the cutting angle for precise construction, and accounts for material waste to ensure you have enough lumber for the project.
Shows rise, run, and stringer length relationship
Stair construction must comply with local building codes for safety and accessibility. Key requirements include maximum riser height, minimum tread depth, consistent dimensions, and proper handrail installation. Our calculator helps ensure compliance while providing optimal comfort and safety for users.
Need help with other construction projects? Check out our baluster calculator and rafter length calculator.
Get Custom Calculator for Your PlatformResult: 13 steps, 153.6" stringer length, 38.7° cutting angle
Material needed: 165.6" (13' 9.6") including waste factor for cuts and errors.
Same dimensions with closed stringer construction
Result: 153.6" stringer length, simpler construction
84" rise, 96" run for space-constrained area
Result: 41.2° angle, 127.3" stringer length
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