DIY

How Many Gallons of Paint?

Built by Kevin Glover · @gloverbuilds · Verified formula

Calculate paint gallons for any room by dimensions. Doors, windows, and coats included.

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

In this article

Paint Coverage
How Many Coats

Le Calcul

1 litre couvre 10-12 m² en surface lisse. Périmètre × hauteur - portes (1,8 m²) - fenêtres (1,2 m²) × couches ÷ 10. Pièce 4×3,5, 2,50 m, 2 couches : ~6 litres. Achetez un pot extra pour les retouches.

Couches

1 couche : retouches même couleur. 2 : changement de couleur. 3 : foncé vers clair ou rouges/jaunes.

⚡ CalcWolf Insight

Buy all paint from the same batch — different batches can have subtle color variations visible on the wall.

Frequently asked questions

Combien pour une chambre de 12 m² ?▾

Murs (2 couches) : ~5-6 litres. Plafond : 2-3 litres.

Faut-il une sous-couche ?▾

Foncé vers clair, taches, plâtre neuf : oui. Même couleur : non.

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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 →