Paint & Primer Calculator: Liters Required per m² of Wall and Ceiling

Calculate how many liters of emulsion, acrylic or facade paint and primer sealer you need based on wall area, window/door deductions and coats.

Gross Wall/Ceiling Area (m²)

Doors & Windows Deduction (m²)

Number of Coats

Paint Type & Coverage Rate

Total Paint Needed17.0 Liters

Net Area per Coat85.0 m²

Primer Sealer (1 coat)8.5 Liters

Suggested Buckets1×15L + 1×4L

Net Paintable Area & Total Liters Formula

Coating Standard (ISO 6504 / EN 13300): Standard interior acrylic emulsion covers 10 to 12 m² per liter per coat on smooth primed plasterboard.

Net Area (m²) = (Wall Perimeter × Height) + Ceiling - Openings
Total Liters = (Net Area × Number of Coats) / Coverage Rate (m²/L)

Coating / Paint Type	Coverage per Coat	Recommended Coats	First Coat Dilution
Water-based primer / sealer undercoat	10 to 12 m²/L	1 base coat	Per datasheet (10% - 20% water)
Interior acrylic / vinyl emulsion (Class 1)	10 to 12 m²/L	2 coats	5% - 10% clean water
Paint on textured / stippled stucco walls	6 to 8 m²/L	2 coats	10% water to penetrate texture
Exterior elastomeric / masonry facade paint	5 to 7 m²/L	2 coats	5% - 10% water

Standard interior acrylic emulsion covers 10 to 12 m² per liter per coat on smooth primed walls (5 to 6 m² finished coverage with 2 coats).

Yes, bare gypsum board and fresh plaster require 1 coat of primer sealer to equalize porosity and prevent flashing.