Paint Calculator — m, m², liters & cost
How to use this calculator
Choose a surface mode — room walls, ceiling, single wall, or custom area. Enter dimensions in meters, centimeters, or millimeters. Select paint type and number of coats. Doors and windows are automatically deducted. Results update instantly.
Paint types — Flat/Matte (12 m²/L), Eggshell (10), Satin (10), Semi-Gloss (10), Gloss (9).
Primer — 1 coat at 10 m²/L for new plaster, dark-to-light colour changes, or stain blocking.
Cost — price per liter of paint and primer, plus optional flat-rate for supplies. Currency selector: €, zł, Kč, kr.
Saved Calculations
| Time | Mode | Area m² | Paint L | Primer L | Coats | Total |
|---|
How to Calculate Paint for a Room (Metric)
This paint calculator estimates the liters of paint and primer needed for walls, ceilings, or any custom surface area. Enter room dimensions in meters, centimeters, or millimeters, choose your paint finish (flat, eggshell, satin, semi-gloss, or gloss), select the number of coats, and optionally add primer. Doors (1.89 m² each) and windows (1.20 m² each) are automatically subtracted.
Formulas Used
Paintable area = wall perimeter × height − doors − windows.
Paint liters = ceil(paintable area × coats × (1 + waste%) ÷ coverage per liter).
Primer liters = ceil(paintable area × (1 + waste%) ÷ 10).
Paint Coverage by Finish
Flat/Matte: 12 m²/L — best for ceilings and low-traffic areas. Eggshell: 10 m²/L — most popular for living rooms and bedrooms. Satin: 10 m²/L — kitchens, bathrooms, hallways. Semi-Gloss: 10 m²/L — trim, doors, cabinets. Gloss: 9 m²/L — high-moisture areas and accent surfaces.
FAQ
Do I need primer? Yes, if painting new plaster, going from dark to light colours, or covering stains. One coat of primer at 10 m²/L is sufficient for most situations.
