Paint Calculator

Calculate the exact gallons, coats, and cost for your paint project. Easily adjust for room size, windows, and doors.

Atualizado: March 23, 2026

Revisto por: Editorial Team· DIY & Construction

Preset (Paint Type)

Coverage (sq ft / Gallon)

Can Size (Gallons)

Price / Can ($)

Room Dimensions

Width (ft)

Length (ft)

Ceiling Height (ft)

Openings Area — Doors/Windows (sq ft)

Number of Coats

Waste Margin (%)

Include ceiling

Results

Walls Area441 sq ft

Ceiling Area180 sq ft

Total Area to Paint621 sq ft

2 coats × 350 sq ft/gal3.5 Gallons

With Waste Margin3.9 Gallons

1-Gallon units needed4

Estimated Cost

$140

Perguntas Frequentes

As dúvidas mais comuns sobre esta ferramenta.

A standard gallon of paint typically covers about 350 to 400 square feet for a single coat on a smooth wall. If the wall is textured or porous, expect 200–250 sq ft per gallon. You usually need two coats for a good finish.

Always plan for at least 2 coats. If you're painting over a dark color with a lighter one, you may need 3 or 4 coats. New or patched drywall should always be primed first to save money on your topcoat paint.

DIY materials usually cost $100–300 depending on the paint quality. Hiring a professional painter typically costs $2 to $6 per square foot of floor space, meaning a 12x12 bedroom might cost $400–$800 total.

If your total paint requirement exceeds 4 gallons of the exact same color, it's generally cheaper and ensures better color consistency to buy a 5-gallon bucket instead of individual 1-gallon cans.

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🧮 Aviso Legal — Ferramenta Utilitária

Os resultados gerados por esta ferramenta são calculados com base nos dados inseridos e têm um carácter estritamente informativo e estimativo. O Orçamento Fácil envida todos os esforços para manter os algoritmos atualizados e precisos, não se responsabilizando por eventuais imprecisões. Estes dados não substituem a análise de um profissional qualificado. Use esta informação como guia ou referência pessoal.

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