Stair Calculator

Stair Calculator — Estimate Risers, Treads, Stringers, Stair Angle & Total Cost Build stairs with confidence. Stair Calculator is a fast, offline estimating tool for carpenters, framers, builders, contractors, and DIY homeowners. Enter your total rise, desired tread depth, and stair width — get an instant breakdown of riser count, tread count, stringer length, stair angle, and total estimated material cost. KEY FEATURES RISER & TREAD CALCULATION Calculate the exact number of risers and treads from total rise and floor-to-floor height. Get individual riser height and tread depth within code-compliant ranges. Supports straight stairs, L-shaped stairs, U-shaped stairs, and winders. Includes headroom verification. STRINGER LENGTH & STAIR ANGLE Calculate stringer length using the Pythagorean theorem from total rise and total run. Get stair angle in degrees, slope percentage, and pitch ratio. Verify comfort using the Blondel formula (2R + T) before you cut lumber. STAIR WIDTH & MATERIAL QUANTITIES Enter stair width to calculate tread board length, stringer count, and total lumber needed. Estimate riser boards, tread boards, stringers, and fasteners. Includes waste factor customization for cuts and defects. COST & LABOR ESTIMATE Enter price per board foot or per unit, plus labor cost per step or per project. See material cost, labor cost, and total project cost separately. Long labels display cleanly, and values are sized to fit large numbers without truncation. CALCULATE & CLEAR BUTTONS Enter your values, tap Calculate to see results, and use Clear to reset. Clean, simple interface designed for job site use. INTERACTIVE STAIR VISUALIZER Visualize your stair profile, riser height, tread depth, and angle as you adjust dimensions. Verify measurements before cutting materials. HISTORY & EXPORT Save calculations to History. Search and filter your list. Share text summaries, export PDF reports in your selected app language, and delete entries with individual confirmation. SETTINGS Switch units, currency (USD, CAD, EUR, CHF, FCFA, GBP, and more), language (EN, FR, ES, AR, ZH), and theme mode (System / Light / Dark — Dark is default). About Us, privacy policy, terms, and contact links included. BUILT FOR THE JOB SITE • Works offline — no internet required for calculations • No sign-up required — start calculating immediately • Responsive layout for phones and tablets • Dark mode by default with high-contrast text for low-light conditions • Clean, readable UI with clear borders for outdoor use WHO IS IT FOR? Carpenters, framers, stair builders, general contractors, remodelers, architects, and DIY homeowners planning interior stairs, exterior stairs, deck stairs, basement stairs, and loft access. WHY CHOOSE THIS APP? Accurate riser and tread calculations, fast stringer and angle estimates, transparent material and labor costing, multilingual PDF reports, and a clean interface that handles long numbers and multiple units. ABOUT KOCHI DIGITAL Kochi Digital builds minimalist, high-performance construction and real estate calculators. Explore more at kochidigital.com. Official website: https://kochidigital.com/apps/staircalculator/ Construction calculators: https://volumesolver.com/construction-calculators/ Download Stair Calculator now and get a reliable estimate — risers, treads, stringers, angle, materials, labor, and total cost — before you cut lumber.