Calculadora de Tinta

Última atualização: 2026-06-23

Use a Calculadora de Tinta para obter resultados precisos. Insira os valores abaixo.
Dados
Resultado
Insira os valores e pressione Calcular
Common Sizes — Click to Fill
Comprimento da parede (m) Altura da parede (m) Número de demãos (pcs) Tipo de tinta Área de portas e janelas (pcs)
10 m 2.5 m 2 pcs 1 2 pcs
12 m 2.5 m 2 pcs 1 3 pcs
14 m 2.7 m 2 pcs 1 3 pcs
16 m 2.7 m 2 pcs 1 4 pcs
20 m 3 m 3 pcs 1 4 pcs
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O que é o Paint Coverage Calculator?

A common DIY mistake is buying paint by guessing — either running short halfway through the second coat or ending up with cans you'll never use. This calculator measures the paintable wall area, subtracts doors and windows, and divides by your paint's coverage rate per litre to give you an exact purchase quantity by number of coats.

You may also find the Wallpaper Calculator, Backsplash Tile Calculator, and Crown Molding Calculator useful.

Quem usa esta calculadora?

This tool is used by homeowners painting a room, professional painters quoting jobs, and property managers budgeting for interior refreshes.

Como usar the Paint Coverage Calculator

  1. Insira Wall length.
  2. Insira Wall height.
  3. Insira Number of coats.
  4. Insira Paint type.
  5. Insira Doors & windows area.
  6. Clique em Calcular para ver os resultados instantaneamente.

Fórmula

The calculator uses the following formula:

Paintable area = (perimeter × height) - doors_windows; Litres = area × coats ÷ coverage_per_litre

Exemplo de cálculo

A 5 m × 4 m room with 2.7 m ceilings, 2 coats, one door, and two windows has about 43 m² of paintable surface. At 12 m²/litre coverage: 3.6 litres needed, so buy two 2-litre tins.

Cálculo passo a passo

  1. Total wall area: 4 × 14 m × 2.5 m = 140 m² (for a square room — adjust for actual perimeter)
  2. Subtract doors/windows: 3 × 2 m² = 6 m² → 134 m² paintable
  3. Standard paint: 10-12 m²/litre; 2 coats: 134 × 2 ÷ 11 = 24.4 litres
  4. 5L cans: ceil(24.4 ÷ 5) = 5 cans

Erros comuns a evitar

  • Using the floor area instead of the wall area
  • Forgetting that dark colours or stained walls need 3 coats instead of 2
  • Not accounting for texture — rough or porous walls absorb 20-30% more paint
Pro Tip: Dark colours and reds typically need 3 coats for full coverage, not 2. If you are painting dark over light or changing colour dramatically, use a tinted primer first — it reduces the number of topcoats needed.

Perguntas frequentes

What is standard paint coverage per litre?
Most interior wall paints cover 10–14 m² per litre per coat. Quality paints are often at the higher end (13–16 m²/L). Exterior paints cover 8–12 m²/L. Primers typically cover 8–12 m²/L. Always check your specific product's data sheet.

Do I need to subtract doors and windows from my paint calculation?
Yes — a standard door is about 1.8 m² and a window 1.5 m². This calculator lets you insira o number of each and deducts them automatically. Skipping this step overestimates paint by 10–20% in a typical room.

How many coats of paint should I apply?
Two coats are standard for most interior repaint jobs. New plasterboard or a drastic colour change may need 3 coats. One coat is sufficient only for touch-ups or very similar colour-on-colour.

Should I paint walls or ceiling first?
Always paint the ceiling first, then walls from top to bottom. This way any drips or spatters on the wall get covered when you paint the wall. Paint skirting boards last.

How do I calculate paint for a room with vaulted ceilings?
For a triangular vault, add (0.5 × width × height of triangle) to the rectangular wall area below. For a curved vault, measure the arc length and multiply by the room length.

Escrito e revisado pela equipe editorial do CalcToWork. Última atualização: 2026-06-23.

calcto.work — Calculated on 2026-06-23