Paint Calculator
Calculate how many liters of paint you need for an area (walls, ceiling). Considers coats, coverage per liter and discounts for doors/windows. Everything in your browser.
How to estimate paint quantity
The base formula is area = perimeter · height − doors − windows and then liters = (area × coats) / yield. Typical yields per liter, per coat: acrylic latex 12–14 m²/L on smooth walls (6–8 m²/L on textured surfaces), synthetic enamel 10–12 m²/L, varnish 8–10 m²/L. Always add a 10–15% margin for losses and touch-ups. One coat is rarely enough; the standard is 2–3 coats. White on white usually works with 2 coats; dark over light requires primer + 2–3 coats. Premium paints (more expensive upfront, cheaper long-term) survive more washes. The Brazilian standard NBR 15079 classifies water-based paints as premium, standard, or economy by wash resistance, hiding power and yield.
Applications
Home renovation budgeting (Leroy Merlin, C&C, Telhanorte estimates), deciding between DIY and hiring labor, painter quotes (avoiding overbilling on material), and resale prep — repainting bedrooms before selling typically pays back several times the paint cost.
FAQ
Why is the yield on the can higher than what I get? Manufacturer yields assume ideal conditions (smooth wall, single light color, experienced painter). Real-world yield is 20–30% lower.
Do I need primer (selador / fundo)? Yes on raw plaster, repaired patches, or color changes (dark → light especially). It seals porosity and saves topcoat paint.
Latex or acrylic? "Latex PVA" is cheaper, for ceilings and low-traffic rooms; "acrylic" (also water-based) is washable, ideal for kitchens, bathrooms and high-traffic areas.
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How much paint for a room
Leftover paint at the end of the job? Money down the drain. Run short halfway through? Back to the shop you go, brush in hand. This calculator estimates how many litres you need to cover an area, whether walls or ceiling, starting from the measurements you enter.
The math includes the number of coats and the coverage per litre printed on the can. You also subtract the area of doors and windows, which nobody paints. The result lands far closer to what you'll actually use than the rough guess you'd get from the raw wall footage.
Everything is handled right here in the browser. Enter the measurements, check how many litres to grab, and only then head to the shop, sparing yourself an extra trip and some cash on the project.