How Much Paint Do I Need for a Bathroom? (2026 Guide)

Bathrooms are small, but that doesn't mean painting is simple. High humidity, moisture damage, and tile-heavy walls change how much paint you need — and which finish you should buy.

This guide gives you a precise bathroom paint estimate, plus the finish and primer recommendations that actually hold up in wet environments.

Quick Answer: About 1 Gallon Per Bathroom

For a typical 5×8 ft bathroom with 8-ft ceilings:

Walls (2 coats): ~1 gallon
Ceiling (2 coats): ~0.5 gallon
Trim/door/vanity: ~1 quart

If your bathroom has wainscoting, tile halfway up the wall, or a large shower surround, you'll need even less — sometimes just a half gallon for the visible wall area.

Formula for Bathroom Wall Area

Step 1 — Measure the Total Wall Area

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

Example: (5 + 8) × 2 × 8 = 208 sq ft

Step 2 — Subtract Non-Paintable Areas

Feature	Area to Subtract
Standard door	~20 sq ft
Window	~15 sq ft
Mirror (typical)	~6 sq ft
Tub/shower surround (tile)	~35 sq ft
Wainscoting/tile (half wall)	~30 sq ft

208 − 20 (door) − 15 (window) − 35 (tub surround) = 138 sq ft

Step 3 — Divide by Coverage

1 gallon ≈ 350 sq ft per coat.

138 ÷ 350 = 0.4 gallons per coat → 0.8 gallons for two coats.

Round up: 1 gallon.

Use our Paint Calculator for bathroom-specific measurements.

Best Paint Finish for Bathrooms

Moisture is the enemy in bathrooms. Your finish choice matters more here than in any other room.

Finish	Best For	Moisture Resistance
Flat / Matte	Ceilings only	Low
Eggshell	Walls in low-humidity baths	Medium
Satin	Standard bathrooms	High ✓
Semi-gloss	Trim, doors, high-humidity baths	Highest ✓
Gloss	Trim only — too shiny for walls	Highest

Recommended: Satin for walls, semi-gloss for trim.

Do You Need Bathroom-Specific Paint?

Many brands sell "bathroom paint" — but the real requirement is:

Mildew-resistant additives
Moisture-resistant finish (satin or semi-gloss)
Mold-inhibiting primer if the room has had mold issues

Regular satin paint with a mildew-resistant primer works just as well and costs less.

Primer — Yes or No?

Primer is strongly recommended in bathrooms if:

You're painting over new drywall or patched walls
There's any existing mold or water stains (treat first, then prime)
You're switching from a dark color
The previous paint is peeling or glossy

Use a mold-inhibiting primer for best results. Budget 1 quart to 0.5 gallon.

Bathroom Painting Checklist

✅ Remove fixtures, mirrors, and towel bars
✅ Clean walls with a mild detergent + water
✅ Repair cracks and caulk gaps
✅ Sand glossy surfaces lightly
✅ Apply primer (1 coat)
✅ Paint walls (2 coats, satin finish)
✅ Paint ceiling (1–2 coats, flat or bathroom ceiling paint)
✅ Paint trim (2 coats, semi-gloss)
✅ Reinstall fixtures after 24 hours

Cost Estimate

Item	Cost
1 gal satin wall paint	$30–$60
1 qt ceiling paint	$10–$20
1 qt semi-gloss trim paint	$15–$25
Primer	$15–$30
Supplies (tape, rollers, brushes)	$25–$40
Total DIY	$95–$175