Calculatrice de Peinture

Dernière mise à jour: 2026-06-23

Utilisez le Calculatrice de Peinture pour obtenir des résultats précis. Saisissez vos valeurs ci-dessous.
Données
Résultat
Entrez les valeurs et appuyez sur Calculer
Common Sizes — Click to Fill
Longueur du mur (m) Hauteur du mur (m) Nombre de couches (pcs) Type de peinture Surface portes et fenêtres (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
Outils associés
Calculatrice de Papier Peint Calculatrice Carrelage Crédence Calculatrice de Corniche Calculateur Peinture Plastique Murs

Qu'est-ce que le 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.

Qui utilise cette calculatrice?

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

Comment utiliser the Paint Coverage Calculator

  1. Saisissez votre Wall length.
  2. Saisissez votre Wall height.
  3. Saisissez votre Number of coats.
  4. Saisissez votre Paint type.
  5. Saisissez votre Doors & windows area.
  6. Cliquez sur Calculer pour voir vos résultats instantanément.

Formule

The calculator uses the following formula:

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

Exemple de calcul

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.

Calcul étape par étape

  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

Erreurs courantes à éviter

  • 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.

Questions fréquentes

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 saisissez le 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.

Écrit et révisé par l'équipe éditoriale de CalcToWork. Dernière mise à jour : 2026-06-23.

calcto.work — Calculated on 2026-06-23