Calculate the dimensions and layout for cutting stair stringers. Enter the total rise, tread depth, and number of risers to determine the stringer board length, throat depth, and each notch cut dimension. Proper stringer cuts are essential for safe, even stairs.
Enter Your Measurements
Results
Stringer Length
176.8
inches
Board Length Needed
15
feet
Riser Height (each)
7.71
inches
Number of Treads
13
treads
Total Run
130.0
inches
Maximum Notch Depth
7.75
inches
Unit Hypotenuse
12.63
inches
Formula
How to Use This Calculator
How to Use
- 1
Enter the total rise (floor to floor height in inches).
- 2
Enter the tread depth (run per step).
- 3
Enter the number of risers (from the stair calculator).
- 4
Enter the stringer board width (2x12 is 11.25 inches actual).
Frequently Asked Questions
Frequently Asked Questions
What size board for stair stringers?
How many stringers do I need?
In-Depth Guides
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About This Calculator
This calculator uses the formula: Riser Height = Total Rise ÷ Risers | Stringer = √(Rise² + Run²) × Risers | Min Throat = Board Width - Notch Depth ≥ 3.5 in. All calculations follow industry-standard methods. Results are estimates — always verify with a licensed professional for structural or code-compliant work.
Built and maintained by the CalcSmart team. Last updated March 2026.
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