How much paint you will need for your home

There's no easy way to know the exact amount of paint you'll need when it comes to painting your home, but there are plenty of ways to make the estimation. Before we get to that, here's a list of things you'll need when you start painting!


  • Sand paper - to even out rough textures and smooth down walls.
  • Mild soap and water - to clean your walls
  • Newspaper (or tarp if you have it) - to protect your floors and your furniture
  • Painter's tape - perfect for covering areas you don't want painted, a must-have for those painting patterns. 
  • Aluminium foil - use it to cover skirting, doorknobs, switches and small fixed items you don't want covered in paint.
  • Paint tray - Well. Duh.
  • Roller brush - you can attach it to a bamboo pole if you can't be bothered to climb on a ladder. We know we can't.
  • Angled brush - great for tighter corners and small edges
  • small flat brush - use it to paint small areas around the edges of your room or at the edges of your painter's tape.
  • Primer - Extremely important! This is what ensures that you'll need less coats and that your paint goes on evenly. Some paints come with primer mixed into the paint colour but check the packaging for that information.
  • Colour - the best part! Give your room a makeover with some brand new colours.

It's time for some math. There's actually an exact formula for estimating how much paint you'll need. But some things you should take note of are this:

  • High quality paint requires few coats of paint 
  • If you need to paint your doors, trim and frames, about 10% of your total paint is enough to keep you covered.
  • Paint tins usually include information on the area a litre of the paint can cover.

1 Gallon = 3.8 Litres
1 Gallon of paint can cover 350sqf
1 Litre of paint can cover 12 - 13sqm

Find your wall area (in square feet):
Total length of walls X Height of wall = Xsqf

Subtract the area of your doors (Dsqf) and windows (Wsqf)
Xsqf - (Dsqf + Wsqf)

Divide this sum by 350sqf and you'll get the number of gallons to purchase.
Xsqf - (Dsqf + Wsqf) / 350 = YGallons

And you're done!

But if you, like us, are too lazy, just use the many online estimators available for use: