Stair Calculator - Calculate Stair Rise, Run, and Stringer Length

How to Use the Stair Calculator

1. Enter total rise — floor-to-floor height
2. Adjust target riser height — optimal is 7 inches
3. Set tread depth — minimum 10 inches
4. Get results — number of steps, stringer length, total run

Perfect for builders, contractors, and DIY staircase construction. Follows standard 7-11 stair guidelines. All calculations in your browser.

Features

• Building code compliant — follows IRC 7" max riser, 10" min tread
• Stringer length — exact cut length for stringers
• Headroom check — warns if clearance is low
• Unit conversion — inches or centimeters
• Printable results — clear breakdown of all measurements