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Calcimator

Paint Coverage Calculator

Calculate how much paint you need for your room. Estimate gallons and quarts based on room dimensions and coverage.

Inputs

ft
ft
ft
sq ft

Results

Total Area to Paint

472 sq ft

Gallons Needed

2.7 gal

Gallons to Buy

3 gal

Wall Area352 sq ft
Ceiling Area120 sq ft
How to Use This Calculator
  1. Enter the room length, width, and ceiling height in feet.
  2. Set the coverage per gallon from the paint label (typically 350–400 sq ft per gallon).
  3. Enter the number of coats — 2 is standard for most interior paints.
  4. Read the total area to paint (walls + ceiling), exact gallons needed, and gallons to buy rounded up.
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Formula

Gallons = (Total Area × Coats) / Coverage per Gallon

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