Paint Calculator
Calculate how much paint you need for a room based on wall dimensions.
100% Client-Side
What is Paint Calculator?
A paint calculator estimates how much paint you need to cover walls, ceilings, or other surfaces based on the area to be painted and the coverage rate of your chosen paint. It factors in doors, windows, and the number of coats needed.
How to Use
- Enter the room dimensions (length, width, and wall height)
- Subtract the area of doors and windows
- Set the number of coats (2 is standard)
- View the total gallons needed and the estimated cost
Formula
Gallons Needed = (Total Wall Area - Unpainted Area) x Number of Coats / Coverage per Gallon
Frequently Asked Questions
- How much area does a gallon of paint cover?
- One gallon covers approximately 350-400 square feet per coat on smooth surfaces. Rough or textured surfaces absorb more paint and reduce coverage.
- How many coats of paint do I need?
- Two coats is standard for most color changes. You may need only one coat for touch-ups or same-color refreshes, and three coats when covering dark colors with light ones.
- Should I buy extra paint?
- Yes, buy 10-15% more than calculated. You'll need it for touch-ups, and paint from the same batch ensures consistent color. Store leftover paint properly for future touch-ups.