Paint for a 18 × 20 room

3.2 gal

Walls of a 18 × 20 room, 8 ft high, 2 coats, 350 ft²/gal

Paint by wall height

Height	Wall ft² (1 door, 2 windows)	1 coat (gal)	2 coats	2 coats + ceiling
8 ft walls	558	1.6	3.2	5.2
9 ft walls	634	1.8	3.6	5.7
10 ft walls	710	2.0	4.1	6.1

Your exact room

Room length (ft)

Room width (ft)

Wall height (ft)

Doors

Windows

Coats

Paint the ceiling too?

Coverage per gallon (ft²)

Price per gallon ($)

FAQ

How much paint for a 18x20 room?

With 8 ft walls, one door and two windows the walls are about 558 ft². Two coats need about 3.2 gallons - buy 4. Including the ceiling: about 5.2 gallons.

X Facebook Reddit WhatsApp LinkedIn

Embed this free calculator on your site (copy & paste):

<iframe src="https://buildtally.pages.dev/paint/18x20-room/?embed=1" width="100%" height="640" style="border:1px solid #ddd;border-radius:12px" loading="lazy" title="BuildTally calculator"></iframe><p style="font-size:13px">Calculator by <a href="https://buildtally.pages.dev/paint/18x20-room/">BuildTally</a></p>

Free calculator by BuildTally

Paint for a 18 × 20 room

Paint by wall height

Your exact room

FAQ

Other room sizes