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Paint Coverage Calculator

Estimate how much paint you need. Calculate the gallons of paint required for your walls, ceiling, and trim for any room in your house.

How to use this calculator

Figure out exactly how much paint you'll need for your next project. Enter your room's dimensions and the number of coats you plan to apply. We'll automatically subtract standard-sized areas for doors and windows. Need help measuring? Check our handy guide.

Details & Coats

Check this box to include the ceiling area in the calculation.

Understanding Your Results with HomeCalc Pro

The HomeCalc Pro paint calculator estimates the total amount of paint you'll need in gallons or liters. This figure is based on your room's dimensions and includes an important "waste factor" to ensure you don't run out mid-project.

Why is a Waste Factor Important?

No painting project uses exactly the amount of paint calculated from raw square footage. A waste factor, typically 10-15%, accounts for:

  • Paint lost in the roller or tray.
  • Paint wasted on masking tape and drop cloths.
  • The need to make cuts around trim, windows, and doors.
  • Potential mistakes or the need for an extra touch-up coat in certain spots.

Frequently Asked Questions

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