Enter room dimensions
ConstructionHow to calculate the amount of paint
The calculation is based on the surface area to be painted (walls, minus doors and windows, and optionally the ceiling), multiplied by the number of coats and paint coverage per square meter. Formula: paint needed = area × number of coats × coverage per m².
How much paint is used per m²
Typical coverage is 0.1-0.15 L/m² per coat, but it depends significantly on:
- Paint type: water-based, latex, oil-based — different density and coverage properties.
- Surface: rough or porous surfaces (like plaster) absorb more paint than smooth ones.
- Color: going from dark to light color or vice versa often requires an extra coat.
- Application method: roller, brush, or sprayer have different paint usage efficiency.
Exact coverage figures are always listed on the specific paint's packaging — it's best to use those for the most accurate calculation.
Why a second coat of paint is needed
A single coat of paint rarely provides even, saturated color coverage — especially when switching to a contrasting color. A second coat evens out the tone, hides streaks from the roller or brush in the first coat, and improves the finish's durability against wear and washing.
It's recommended to buy about 10% extra paint for surface irregularities, touch-ups, or future minor repairs in the same shade.
FAQ
How much paint do I need per square meter?
Typical coverage is 0.1-0.15 L/m² per coat, depending on paint type, surface, and application method. Exact figures are always listed on the specific paint's packaging.
Why is a second coat of paint needed?
A second coat ensures even color coverage, hides roller or brush marks from the first coat, and improves the durability of the finish.
Should I buy extra paint as a buffer?
Yes, it's recommended to add about 10% extra for surface irregularities, touch-ups, or future minor repairs in the same color.