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Free interior painting tool
Paint Calculator
A professional wall paint estimator for every room.
Enter your room's dimensions and we'll calculate exactly how much paint and primer to buy, how many cans you need, and what it will cost — accounting for doors, windows, waste, and coats.
Accurate to the gallon
No sign-up required
Works for any unit system
Your paint estimate
Based on the dimensions and settings you entered above.
Fill in your room details and click Calculate paint to see your personalized estimate.
Smart recommendations
Buying guide
Which paint finish should you choose?
Every finish behaves differently under light, wear, and cleaning. Here's how the six most common finishes compare.
| Finish | Best use | Advantages | Disadvantages | Cleaning | Durability |
|---|
Room by room
Recommended finish for each room
A quick reference so you can match the finish to how the room is actually used.
Painting knowledge base
Everything you need to paint with confidence
Practical, experience-based guidance to go along with your estimate.
FAQ
Frequently asked questions
Planning more than paint?
Explore our other room-planning guides to finish the project from floor to ceiling.