DIY

Staircase Calculator

Built by Kevin Glover · @gloverbuilds · Verified formula

Calculate stair rise, run, and number of steps from floor-to-floor height. Code compliant. Free calculator.

📅 Updated April 2026 ✅ Formula verified 📖 4 min read 🆓 Free · No sign-up

In this article

How to Use This Calculator
Tips for Best Results

Dimensions

Contremarche : 16-18 cm. Giron : 25-32 cm. Formule de Blondel : 2×contremarche + giron = 60-65 cm. Le code limite la variation entre contremarches à 5 mm. L'angle idéal : 25-35°. Nombre de marches = hauteur totale ÷ contremarche souhaitée.

Calcul

Pour 2,70 m de hauteur avec contremarches de 17 cm : 270÷17 = 15,9 → 16 marches de 16,9 cm ou 15 de 18 cm. Ajustez pour que toutes soient identiques.

⚡ CalcWolf Insight

Inconsistent riser heights are the leading cause of stair falls. Building code limits variation to 3/8 inch because even tiny inconsistencies trip people — your foot expects every step to be identical.

Frequently asked questions

Combien de marches pour 2,70 m ?▾

15-16 marches selon la contremarche choisie. 270÷17 = ~16 marches de 16,9 cm.

Dimensions standard ?▾

Contremarche : 16-18 cm. Giron : 25-32 cm. Largeur : 80 cm minimum résidentiel.

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Kevin Glover · @gloverbuilds

Founder, CalcWolf · GLVTS · Blickr

All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →