How Much Paint Do I Need for a 3-Bedroom House in 2026? Full Calculator Guide + Cost Breakdown
By Paint Pro Calc Team
A complete room-by-room guide to calculating paint for a full 3-bedroom house, with real cost breakdowns for the US, UK, Australia, and New Zealand.
How Much Paint Do I Need for a 3-Bedroom House in 2026?
Painting an entire house is one of the biggest cosmetic projects a homeowner or contractor takes on. Get the quantities wrong and you're either making multiple hardware store trips or storing a garage full of leftover paint.
This guide walks through every room in a typical 3-bedroom house, calculates the exact paint needed, and gives you real cost breakdowns for the US, UK, Australia, and New Zealand.
What's in a Typical 3-Bedroom House?
For this guide, we'll use a standard 3-bedroom home layout:
| Room | Dimensions |
|---|---|
| Bedroom 1 (master) | 4.5m × 4m |
| Bedroom 2 | 3.5m × 3.5m |
| Bedroom 3 | 3m × 3m |
| Living room | 6m × 4.5m |
| Kitchen | 4m × 3.5m |
| Bathroom | 2.5m × 2m |
| Hallway & landing | 8m × 1.2m |
All rooms have 2.4m ceilings. We're calculating walls only (add 15–20% if you're doing ceilings too).
Room-by-Room Paint Calculation
Bedroom 1 (Master) — 4.5m × 4m
Perimeter = (4.5 + 4) × 2 = 17m Wall area = 17 × 2.4 = 40.8m² Deduct 1 door + 1 window = −3m² Net area = 37.8m² 2 coats ÷ 11 m²/L = 6.9L → buy 8L
Bedroom 2 — 3.5m × 3.5m
Net area after deductions ≈ 28m² 2 coats → 5.1L → buy 6L
Bedroom 3 — 3m × 3m
Net area ≈ 23m² 2 coats → 4.2L → buy 5L
Living Room — 6m × 4.5m
Perimeter = (6 + 4.5) × 2 = 21m Wall area = 21 × 2.4 = 50.4m² Deduct 1 door + 2 windows = −5.4m² Net area = 45m² 2 coats → 8.2L → buy 10L
Kitchen — 4m × 3.5m
Net area ≈ 28m² (heavier deductions for cabinetry areas) 2 coats → 5.1L → buy 6L
Bathroom — 2.5m × 2m
Net area ≈ 18m² (tile areas deducted) 2 coats → 3.3L → buy 4L
Hallway & Landing — 8m long
Net area ≈ 28m² 2 coats → 5.1L → buy 6L
Total Paint Required
| Area | Paint Needed |
|---|---|
| All bedrooms | ~19L |
| Living room | ~10L |
| Kitchen | ~6L |
| Bathroom | ~4L |
| Hallway & landing | ~6L |
| Total (walls only) | ~45L |
| With 10% buffer | ~50L |
If you're painting ceilings too, add approximately 15–20L more, bringing the total to 65–70L for the full interior.
Cost Breakdown by Country (2026 Prices)
🇺🇸 United States
- Mid-range interior paint: $15–$25/L
- 50L total: $750–$1,250 materials
- Labour (DIY): Free | Professional: $1,500–$3,000
- Total professional job: $2,250–$4,250
🇬🇧 United Kingdom
- Mid-range interior paint: £8–£15/L
- 50L total: £400–£750 materials
- Professional labour: £800–£1,800
- Total professional job: £1,200–£2,550
🇦🇺 Australia
- Mid-range interior paint: $12–$20/L (AUD)
- 50L total: $600–$1,000 materials
- Professional labour: $1,200–$2,500 AUD
- Total: $1,800–$3,500 AUD
🇳🇿 New Zealand
- Mid-range interior paint: $14–$22/L (NZD)
- 50L total: $700–$1,100 materials
- Professional labour: $1,500–$2,800 NZD
- Total: $2,200–$3,900 NZD
💡 Pro tip: These ranges vary significantly by brand, finish, and region. Always get at least 2 quotes from local painters.
Factors That Change Your Paint Quantity
1. Paint finish type Matte/flat finishes have slightly higher coverage than gloss. If you're using semi-gloss for kitchens and bathrooms, expect 10–15% less coverage per litre.
2. Wall colour change Going from dark to light (or light to dark) usually requires an extra coat. Add 50% more paint for dramatic colour changes.
3. New plaster or drywall Fresh plaster is highly absorbent. You'll need a diluted first coat (mist coat) that soaks in. Budget an extra 20–30% paint for new plaster.
4. Textured walls Stippled or heavily textured walls absorb significantly more paint. Add 20–30% to your estimate.
5. Quality of paint Premium paints (like Dulux Weathershield, Benjamin Moore Aura, or Resene X-200) often cover better in fewer coats, saving money overall despite higher upfront cost.
How to Save Money on a Whole-House Paint Job
- Buy in bulk — most paint retailers offer discounts at 20L+
- Stick to one colour — fewer trips to the store, no leftover quarter-tins
- Use the right primer — good primer means fewer finish coats needed
- Calculate accurately — use Paint Pro Calc to avoid over-ordering
- Do prep work yourself — filling holes, sanding, and taping is time-consuming but you can DIY it
Use the Free Paint Calculator
Don't want to do all this math manually? Paint Pro Calc handles every calculation automatically — including deductions for doors and windows, coverage rates by paint type, cost estimates, and suggested quote prices.
→ Calculate Your House Paint Free
For Contractors: Quote the Whole Job Professionally
If you're quoting a 3-bedroom house for a client, accuracy is everything. Under-quote and you lose profit. Over-quote and you lose the job.
Paint Pro Calc Pro gives you:
- Room-by-room project builder — calculate each room separately
- PDF quote generator — branded, professional, ready to email
- Profit tracker — see your actual margin vs your quote
- Client records — store all contact details and job history
At $2.99/month, it pays for itself on your very first quote.
Summary
A typical 3-bedroom house requires 45–50 litres of paint for walls only, or 65–70 litres including ceilings. Costs range from $1,200 to $4,250 USD for a professionally painted interior, depending on your location, paint quality, and labour rates.
Use Paint Pro Calc to get an accurate estimate for your specific home — it takes less than 2 minutes and it's completely free.