Planning a painting project can be exciting — but knowing exactly how much paint you need can make or break your budget and efficiency. Too little, and you risk running out mid-project. Too much, and you’re left with unnecessary leftovers. So, how much paint do you really need?
1. Measure Your Room
Start with the basics: measure the length and height of each wall. Then add those together to calculate the total square footage.
Formula:
(Wall Length × Height) × Number of Walls = Total Surface Area in sq. ft.
Don’t forget to subtract:
Windows
Doors
Built-ins or cabinets
2. The General Rule of Thumb
One gallon of paint typically covers 350–400 square feet with one coat.
So, if your room totals 800 square feet, you’ll need:
2 gallons for one coat
4 gallons for two coats
✅ Tip: Always plan for at least two coats for best coverage — especially if changing colours drastically.
3. Consider Paint Type & Surface
Different paints and surfaces can affect coverage:
Textured walls require more paint
Darker colours often need more coats
Primed or previously painted walls use less
Need help picking the right paint? Browse our paint collections to explore high-quality options tailored for any surface.
4. Use a Paint Calculator
Want to save time? Use Randalls' expert advice and tools — or connect with our in-store team for a free paint estimate based on your room dimensions. Our Services page details how we can assist you from planning to finish.
5. Need a Painter or Advice?
If you're unsure, consult our pros:
📞 Contact Us for personal help or a custom quote.
Final Thoughts
Understanding how much paint you need saves time, money, and frustration. Whether you’re tackling a small bedroom or a full home makeover, planning properly is key.
Still unsure?
Let our knowledgeable team at Randalls Paint & Décor guide you to the perfect amount of paint and the right tools.