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How Much Paint Do You Need?

Calculate gallons of paint needed for any room. Enter dimensions, number of coats, and get the exact amount with cost estimate.

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

O Cálculo

Um litro de tinta cobre 10-12 m² em superfície lisa. Perímetro × altura - portas (1,8 m²) - janelas (1,2 m²) × demãos ÷ 10. Quarto de 4×3,5 a 2,50m, 2 demãos: ~6 litros. Compre um galão extra para retoques futuros.

Demãos

1 demão: só retoques da mesma cor. 2 demãos: qualquer mudança de cor. 3: escuro para claro ou vermelhos/amarelos. Um selador antes de mudanças drásticas economiza tinta de acabamento (é mais barato).

⚡ CalcWolf Insight

Benjamin Moore and Sherwin-Williams premium paints cover 400+ sq ft per gallon vs 300 sq ft for budget paints. At 2 coats on a 12×12 room, premium requires 2 gallons ($120) while budget requires 3 gallons ($84) — premium is only $36 more and looks significantly better.

Frequently asked questions
Quantos litros para quarto de 12 m²?
Paredes (2 demãos): ~5-6 litros. Teto: 2-3 litros. No Brasil: lata de 3,6L custa R$80-200 dependendo da marca.
Preciso de selador?
Sim para: escuro para claro, manchas, reboco novo. Para mesma cor: tintas 2-em-1 servem.
✓ Math logic verified against primary sources → See our verification process
Kevin Glover
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 →
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