Will One Gallon of Paint Cover a Bedroom?

Short answer: sometimes. One gallon covers 350–400 square feet of wall area, which is enough for a small bedroom's walls at one coat — but not for two coats on a standard 10×12 room.

This guide breaks down exactly what one gallon can cover, how to check your room, and how to avoid the classic mid-project "we ran out of paint" disaster.

What One Gallon Covers

Paint Type	Coverage Per Gallon
Premium interior wall paint	400 sq ft (1 coat)
Standard interior wall paint	350 sq ft (1 coat)
Economy interior wall paint	300 sq ft (1 coat)
Primer	250 sq ft
Ceiling paint	350 sq ft

These are for smooth, previously-painted walls. Textured walls, bare drywall, and dark-to-light color changes will all reduce coverage.

How to Check Your Bedroom

Step 1 — Measure Wall Area

Wall area = (Length + Width) × 2 × Wall Height

Example: (10 + 12) × 2 × 8 = 352 sq ft

Step 2 — Subtract Doors and Windows

Door ≈ 20 sq ft, window ≈ 15 sq ft.

352 − 20 − 15 = 317 sq ft

Step 3 — Compare to Coverage

317 sq ft ÷ 350 sq ft per gallon = 0.9 gallons for ONE coat

Two coats? You'll need 1.8 gallons — so one gallon is not enough for a standard bedroom.

Check your exact numbers with our Paint Calculator.

When One Gallon IS Enough

Small bedroom (10×10 or smaller) with one coat
Walls partially covered by wainscoting or paneling
Touch-up painting where only 1–2 walls need work
Very light color over the same light color, one coat acceptable
Accent wall painting (one wall only)

When You Need More Than One Gallon

Standard or master bedroom with 2 coats → 2 gallons
Dark-to-light color change → 2 gallons + 1 primer
Textured or porous walls → 2 gallons
Ceiling included → add 1 gallon
Trim included → add 1 quart

Bedroom Size vs Paint Needed

Bedroom Size	Wall Area	1 Coat	2 Coats
8×10	~288 sq ft	1 gal	2 gal
10×10	~320 sq ft	1 gal	2 gal
10×12	~352 sq ft	1 gal (barely)	2 gal
12×12	~384 sq ft	1–2 gal	2 gal
12×16	~448 sq ft	2 gal	2.5 gal
15×20	~560 sq ft	2 gal	3 gal