Deck Stair Calculator
Calculate stair steps, stringers, and treads for decks.
Last updated: June 2026
📋Full cost guides, how-to steps, and contractor pricing breakdowns at EstimatorSuite.com
Measure vertical distance from ground to top of deck boards.
Code max: 7.75". Standard: 7".
Code min: 10". Standard: 11".
Code min: 36". Standard: 36".
Stair Geometry & Material Count
Number of steps6
Actual riser height6"
Total run66" (6′)
Stringer length88" (8′ 2x12)
Stringers
3
Tread boards
42
Riser boards
6
Code-compliant (IRC R311.7)
- Riser 6" (max 7.75")
- Tread 11" (min 10")
- Width 36" (min 36")
Material Cost Estimate
Materials$502 - $1,236PT lumber + hardware
Total (with labor)$753 - $2,472
Based on: 36" total rise ÷ 6 steps = 6" per step. Stringer = sqrt(36² + 66²) + 12" = 88". IRC R311.7 compliant. Prices from Home Depot + Lowe's 2026. Verified: June 2026.
Disclaimer: These estimates are for budgeting purposes only. Actual costs depend on your location, current material prices, and contractor rates. Always get 2-3 quotes from licensed contractors before starting any project.