Paint Coverage Calculator
Estimate paint required for rooms, walls, or custom surfaces using coats, coverage rate, wastage, and can size.
How to Calculate Paint Required
A paint coverage calculator estimates paint quantity by first computing the paintable area, multiplying by the number of coats, and then dividing by your paint’s coverage rate (area per liter or per gallon). Adding a small wastage percentage helps account for touch-ups, roller loss, spillage, and uneven surfaces.
Paint Coverage Explained
Coverage varies by paint type, surface texture, and application method. Smooth interior walls often cover more area per unit than rough masonry or exterior surfaces. Always use the coverage information printed on the paint can when possible.
Why Multiple Coats Matter
Two coats are common for good color depth and uniform finish, especially when changing colors. More coats increase the adjusted area and therefore increase paint required.
FAQ
iHow much paint do I need for a room?
Calculate wall area (and ceiling if included), subtract openings, multiply by coats, then divide by coverage. Add wastage for safety.
How many square feet does a gallon cover?
Many paints cover around 300–400 ft² per gallon on smooth walls, but it varies. Check your paint label for the best estimate.
How many coats of paint are needed?
Two coats are common for an even finish. Dark-to-light changes, stains, or rough surfaces may require additional coats.
How do I calculate wall area?
Wall area equals width × height. For multiple walls, multiply by the number of walls, then subtract openings if applicable.
Should I include ceiling in paint calculation?
If you plan to paint the ceiling, include it. Ceiling area is room length × room width.
Disclaimer
This calculator provides an estimate only. Real paint usage depends on surface condition, paint type, primer, application method, and waste. Always verify with your paint supplier and allow a small safety margin.