Paint guides
Short, practical guides to help you work out how much paint to buy.
- Paint calculator
Enter your room size and get the gallons to buy, with the math shown.
- How to measure a room for paint
The measurements you need, a diagram, a worked example and tips for odd shapes.
- How much paint you need for common room sizes
A table of gallons for room sizes from 10 × 10 to 20 × 20 feet.
- How many coats of paint do you need?
When one coat is enough, when to prime, and how coats change what you buy.
- How much does a gallon of paint cover?
Typical coverage for walls, ceilings and primer, and how to read the can.
- Methodology, assumptions and sources
The formulas, default values and sources behind every result.