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paintClassic tool

Paint Calculator

Estimate how much paint you need for walls, ceilings and exterior surfaces before buying supplies.

Use this paint calculator to estimate how much paint you need before starting a room refresh, ceiling job, office repaint or exterior project. The estimate factors in total surface size, deductions for doors and windows, the number of coats and an extra margin for touch-ups, waste and porous surfaces.

Enter the size of the area you plan to paint, subtract the sections that stay untouched, choose the number of coats and adjust the coverage rate to match the paint can you are considering. That gives you a faster way to plan purchases, reduce leftover paint and avoid running short in the middle of the job.

The result shows paintable area, adjusted coverage after coats, total paint in liters and gallons and a simple purchase suggestion based on common container sizes. It works well for small repairs, apartment painting, house renovations and quick budget checks before you go to the store.

Many interior paints cover around 350 to 400 square feet per gallon, but the product label should always guide the final estimate.

SummaryFill in the fields to estimate paint quantity.
Paintable area—
Adjusted area—
Total in liters—
Total in gallons—
Purchase suggestionAdjust the values to build a purchase suggestion.
Formula used—

Use clear inputs to get a more useful result.