Paint Coverage Calculator
Calculate how much paint you need for walls and ceilings
About this calculator
The Paint Coverage Calculator helps you determine exactly how much paint you need for your walls and ceilings, preventing costly overbuying or project delays from running short. Simply input your room dimensions, and the calculator accounts for doors, windows, and multiple coats to provide accurate paint quantity estimates. This tool saves money, reduces waste, and ensures you purchase the right amount of paint for any interior or exterior painting project.
How to use
Enter the length, width, and height of each wall or ceiling you plan to paint. Input the number of doors and windows to subtract their areas from the total coverage needed. Specify how many coats you'll apply, then the calculator will display the total square footage and recommended paint quantity in gallons.
Frequently asked questions
How much area does one gallon of paint typically cover?
One gallon of paint generally covers 350-400 square feet with one coat, though coverage varies by paint type and surface texture.
Should I account for primer when calculating paint needs?
Yes, if using primer, calculate it separately as primer coverage rates differ from paint and may require different quantities.
How do I handle rooms with vaulted or angled ceilings?
For complex ceiling shapes, measure the actual surface area or break it into simpler geometric shapes and calculate each section separately.