House Paint Estimator – Calculate Paint for Your Entire Home
Repainting your whole house? Our free estimator calculates paint quantities for every room inside and out — so you buy exactly what you need.
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How to Estimate Paint for a Whole House
Estimating paint for an entire house — interior or exterior — requires calculating every room and surface systematically. Work through each room individually using our calculator, then add the totals. For a rough whole-house estimate, use the average room count and standard dimensions in the table below.
Don't forget exterior surfaces if you're painting outside. Exterior walls are often larger and rougher, requiring 6–10 m²/L coverage instead of the interior standard of 10–12 m²/L.
Whole House Paint Estimate by House Size
| House Size | Wall Area (approx) | Interior Paint (2 coats) | Exterior Paint (2 coats) |
|---|---|---|---|
| 1-bedroom apartment | 150–200 m² | 30–40 litres | N/A |
| 2-bedroom house | 250–350 m² | 50–70 litres | 40–60 litres |
| 3-bedroom house | 350–480 m² | 70–96 litres | 55–90 litres |
| 4-bedroom house | 480–650 m² | 96–130 litres | 80–120 litres |
| 5+ bedroom / large | 650 m²+ | 130+ litres | 100+ litres |
Room-by-Room Interior Paint Breakdown
Bedrooms (× 3)
Average ~35 m² per bedroom. 3 bedrooms = 105 m². Two coats at 10 m²/L = 21 litres. Add master bedroom at ~42 m² = 8.4 litres. Total bedrooms: ~29 litres.
Living & Dining
Large open area ~55 m². Two coats at 10 m²/L = 11 litres.
Kitchen
~20 m² paintable area. Two coats = 4 litres. Use satin or semi-gloss.
Bathrooms (× 2)
~18 m² each = 36 m² total. Two coats = 7.2 litres. Use moisture-resistant paint.
Hallways & Stairs
~30 m². Two coats of durable scrubbable paint = 6 litres.
House Painting Tips
Calculate each room separately for the most accurate whole-house estimate
Add 10–15% buffer to the total for touch-ups, waste, and missed spots
Order all paint at the same time from the same batch for colour consistency
Consider the season — don't paint exteriors in temperatures below 10°C
Use the same base colour across multiple rooms to simplify purchasing and reduce cost
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