DIY Home Improvement Calculators

Paint rollers and paint cans

Understanding Your Paint Project

Our Paint Calculator simplifies estimating how much paint you'll need for your walls and ceilings. Just input the total area you plan to paint and the number of coats you intend to apply. The calculator uses a standard coverage rate to give you an accurate estimate, helping you avoid overbuying or running out mid-project.

Painting Tips for a Perfect Finish:

Paint Calculator FAQs:

What is a typical paint coverage rate?
Most standard paints cover approximately 350-400 square feet per gallon (or 10-12 square meters per liter) for a single coat on a smooth surface. Our calculator uses a conservative estimate to ensure you have enough.
Why do I need multiple coats of paint?
Multiple coats improve color richness, hide imperfections, and increase the durability and longevity of your paint job. Often, a primer plus two topcoats is recommended, especially when changing colors significantly.
How do I account for doors and windows?
For best accuracy, measure the total wall area first, then measure the area of any large openings (doors, windows, large built-ins) and subtract them from your total. The calculator assumes you'll paint the entire input area.
What if I'm painting a ceiling too?
Simply calculate the ceiling area (length x width) and add it to your total wall area before inputting it into the calculator. Treat ceilings as another wall for estimation purposes.