Popular calculators
Enter dimensions below for walls, ceiling, fence, deck, or wallpaper — coats, waste, and coverage from your paint can, with a copyable shopping list.
Behr Paint Calculator Canada
Free paint calculator for Canadian DIY — enter room size, coats, and label coverage for gallons to buy (Behr or any brand).
Rooms
Project settings
Default 10% for touch-ups
Project guides
View allPrimer, wall repair, prep checklists, and step-by-step painting — then use the calculator above for gallons.
How it works
- 1. Measure roomsEnter length, width, and ceiling height in feet and inches for each rectangular room.
- 2. Set product & coatsPick paint or stain (fence, house exterior, deck), adjust coats, coverage from your can, and openings if needed.
- 3. Buy with confidenceWe calculate gallons (and quarts) and let you copy a shopping list for the paint counter.
Paint, stain & wallpaper
Use the calculator above for paint and stain. For wallpaper rolls, pattern repeat, and accent walls, try our wallpaper calculator or read our wallpaper roll guide.
FAQ
How much paint do I need for a room?
Enter room size in how much Behr paint do I need (or below on this page). Formula: wall area = 2 × ceiling height × (length + width); multiply by coats, add waste, divide by sq ft/gallon on the can. A 12×12 with 8 ft ceilings is about 2–3 gallons for two coats.
How many sq ft does a gallon of paint cover?
Most interior latex covers 350–400 sq ft per gallon on smooth walls. Behr Premium Plus Interior often lists up to 400 sq ft/gallon — enter that label number in the Behr paint coverage calculator for gallons to buy.
Is there a Behr paint calculator?
Yes — this homepage is the free Behr paint calculator for Canada. Enter room size below. For “how much Behr paint do I need” as a focused shopping list, open that tool; for coverage-only math, use the Behr paint coverage calculator.
How much Behr paint do I need for a 12×12 room?
About 2–3 gallons for walls with two coats when Behr lists ~400 sq ft/gallon. Open how much Behr paint do I need and enter your exact dimensions and can label.
Does this work for fence or deck stain?
Yes. Choose fence stain, house exterior stain, or deck stain. Fence uses run length × panel height; deck uses length × width; house stain uses building footprint and wall height.
Can I calculate multiple rooms?
Yes. Add up to five rooms and the calculator totals paintable area and gallons for the whole project.