How Much Paint Do You Need for a Whole House?
Painting a whole house interior is the largest paint project most homeowners ever undertake. The total paint quantity depends on the number of rooms, ceiling height, and how many surfaces you are painting. A typical 1,500 square foot home with 3 bedrooms, 2 bathrooms, a kitchen, living room, and hallways has approximately 3,000 to 3,500 square feet of paintable wall area across all rooms. At 400 square feet per gallon with two coats, that equals 15 to 17 gallons for walls only.
A larger 2,500 square foot home with 4 bedrooms and open-plan living areas has approximately 5,000 to 5,500 square feet of paintable wall area — requiring 25 to 28 gallons for two coats on walls. If you are also painting ceilings, add 30 to 40% more paint to cover all horizontal surfaces.
The most accurate way to calculate whole house paint is to add each room individually in the calculator above. Enter the dimensions of each room, check the surfaces you are painting, and the calculator totals the paint needed across all rooms automatically.
Whole House Paint Calculator — Reference Table
| House Size | Bedrooms | Walls Only | Walls + Ceilings |
|---|---|---|---|
| 800 sq ft | 1–2 bed | 8–10 gal | 11–14 gal |
| 1,000 sq ft | 2 bed | 10–13 gal | 14–18 gal |
| 1,500 sq ft | 3 bed | 15–18 gal | 20–25 gal |
| 2,000 sq ft | 3–4 bed | 18–22 gal | 25–30 gal |
| 2,500 sq ft | 4 bed | 25–28 gal | 33–38 gal |
| 3,000 sq ft | 4–5 bed | 28–34 gal | 38–46 gal |
How to Save Money Painting a Whole House
Buying paint in 5-gallon buckets instead of individual gallons saves 15 to 20% on paint costs for whole house projects. Most paint brands offer 5-gallon buckets at a significant discount per gallon compared to single gallons. For a 15 to 20 gallon whole house project, buying four 5-gallon buckets saves $40 to $80 over buying individual gallons.
Using the same colour throughout the entire house is the most cost-effective approach — one large quantity at a bulk discount rather than many small quantities. A single neutral colour like Sherwin-Williams Agreeable Gray or Benjamin Moore Simply White in one 5-gallon bucket covers the entire house and creates a cohesive unified look.
Best Paint Colours for a Whole House
When painting a whole house in one colour, warm neutrals are the safest and most universally appealing choice. They work with any furniture style, look good in both natural and artificial light, and appeal to the widest range of buyers if you are painting before selling.
Sherwin-Williams Agreeable Gray (SW 7029) is the most popular whole-house colour in the US — a warm greige that flatters every room. Benjamin Moore Pale Oak (OC-20) is a warm beige with pink undertones that looks sophisticated throughout an entire home. Sherwin-Williams Accessible Beige (SW 7036) is slightly warmer than Agreeable Gray and works beautifully in homes with warm wood floors and furniture.
For a whole house white, Benjamin Moore White Dove (OC-17) and Sherwin-Williams Alabaster (SW 7008) are the two most popular choices — both warm whites that avoid the clinical coldness of pure bright white.
What Order to Paint Rooms When Painting a Whole House
Paint rooms in this order to minimise disruption and maximise efficiency. Start with the rooms furthest from the front door and work toward the exit so you never paint yourself into a corner. Bedrooms and bathrooms first, then hallways, then kitchen, then living and dining rooms last.
Within each room, always paint in this order: ceiling first, then walls, then trim and doors last. This way any ceiling drips get covered by wall paint, and any wall paint on trim gets cleaned up when you paint the trim.
Tips for Painting a Whole House
Buy all paint at once. Paint colour can vary between batches — known as lot variation. Buy all your paint in a single purchase to ensure consistent colour throughout the house.
Box your paint. Pour all cans of the same colour into a large bucket and mix together before painting. This eliminates any subtle colour differences between cans.
Use the same finish throughout common areas. Use eggshell or satin for all common areas — living room, hallways, dining room. Use semi-gloss for bathrooms and kitchen. This simplifies buying and creates visual consistency.
Label each room's paint. Keep a small labelled sample jar from each room's paint for future touch-ups. Touch-up paint that is stored correctly lasts 5 to 10 years.
Rent a paint sprayer for large projects. A paint sprayer covers whole house interiors significantly faster than rolling. Rent one for the day for around $60 to $80 — the time saved on a whole house project is worth it.
Related Paint Calculators
- Bedroom Paint Calculator →
- Living Room Paint Calculator →
- Kitchen Paint Calculator →
- Bathroom Paint Calculator →
- Exterior Paint Calculator →
- Primer Calculator →
- Free Paint Calculator →
Frequently Asked Questions
How much paint do I need to paint a whole house interior?
A typical 1,500 sq ft home needs 15 to 20 gallons for two coats on all walls. A larger 2,500 sq ft home needs 25 to 30 gallons. Use the calculator above and add each room separately for a precise total.
How long does it take to paint a whole house interior?
A professional crew of two takes 3 to 4 days for a 1,500 sq ft home. A single DIY painter takes 7 to 10 days working weekends. Factor in at least 4 hours drying time between coats.
How much does it cost to paint a whole house interior?
Professional painting costs $3,500 to $7,000 for a 1,500 sq ft home including labour and materials. DIY costs $300 to $800 in paint and supplies for the same size home.
Should I use the same colour throughout the whole house?
One neutral throughout creates a cohesive open feel and simplifies buying. Different colours per room creates character. A popular approach is one neutral for common areas and bolder accents in bedrooms.
What order should I paint rooms in a whole house?
Bedrooms and bathrooms first, then hallways, then kitchen, then living and dining rooms last. Within each room: ceiling first, then walls, then trim and doors.
How many gallons for a 2000 sq ft house interior?
A 2,000 sq ft home needs 18 to 22 gallons for two coats on all interior walls. Add 4 to 6 gallons for ceilings and 2 to 3 gallons for trim and doors. Buy in 5-gallon buckets to save money.