DIY

How Much Exterior Paint Do You Need?

Built by Kevin Glover · @gloverbuilds · Verified formula

Calculate gallons of exterior paint for your house by siding type, square footage, and number of coats.

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

In this article

Calculating Exterior Paint Coverage
Prep Work Determines Quality
Best Time to Paint Exterior

Rendimento Externo

Um litro cobre 6-8 m² em superfície externa (mais rugosa). Fachada de casa de 100 m² de terreno × 2 andares: ~120-160 m² de paredes. × 2 demãos = 240-320 m² ÷ 7 = 35-46 litros. Tinta acrílica premium para exteriores (R$200-400/lata 18L) dura 8-12 anos. Economizar na qualidade = repintar em 3-5 anos.

Preparação

A preparação é 70% do trabalho: lavagem com hidrojato, raspagem de áreas descascadas, aplicação de fundo preparador em superfícies novas. Uma boa preparação faz a tinta durar 2-3× mais.

⚡ CalcWolf Insight

The north side of a house typically needs repainting sooner due to more moisture retention and less UV exposure (which paradoxically helps cure and harden paint). Plan to touch up the north side 1-2 years before doing a full repaint.

Frequently asked questions

Quanto para pintar uma casa toda?▾

Materiais DIY: R$1.500-3.000. Profissional: R$5.000-15.000. O preço profissional inclui preparação.

Qual tinta escolher?▾

Acrílica premium para exteriores. Evite tintas baratas — a diferença de R$100/lata custa milhares em repintura antecipada.

✓ Math logic verified against primary sources → See our verification process

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 →