Exterior Paint Calculator
Exterior painting requires different paint coverage rates than interior projects because surfaces like brick, stucco, and rough wood absorb more paint. Our exterior paint calculator accounts for the surface type to give you an accurate estimate of both paint and primer requirements.
Exterior Dimensions
Surface Type
Wall area
1,400 sq ft
Paint needed
11.20 gallons
2 coats
Primer needed
4.00 gallons
Total Paint + Primer
15.20 gallons
Surface: Brick · Buy extra for porous surfaces
Exterior paint coverage varies significantly by surface porosity and condition. Always buy 15-20% extra for exterior projects, especially on brick and stucco.
Exterior painting requires different paint coverage rates than interior projects because surfaces like brick, stucco, and rough wood absorb more paint. Our exterior paint calculator accounts for the surface type to give you an accurate estimate of both paint and primer requirements.
How to Use This Calculator
- 1.Enter the exterior wall dimensions (length, width, and height).
- 2.Select the surface type: Brick, Wood, Stucco, or Metal — each has a different coverage rate.
- 3.Set the number of coats (2 coats recommended for exterior durability).
- 4.The calculator shows paint volume, primer volume, and the combined total.
Exterior Paint Coverage by Surface Type
Exterior wall area = 2 × (Length + Width) × Height. Coverage rates vary by surface: Brick absorbs more paint, covering only 250 sq ft/gal (6 sq m/litre). Wood covers 350 sq ft/gal (9 sq m/litre). Stucco is the most porous, covering just 200 sq ft/gal (5 sq m/litre). Metal surfaces are smooth, covering 400 sq ft/gal (10 sq m/litre). Paint Volume = (Wall Area × Coats) ÷ Surface Coverage Rate. Primer Volume = Wall Area ÷ Primer Coverage (350 sq ft/gal or 9 sq m/litre).
Frequently Asked Questions
How much paint do I need for a brick exterior?
Brick is highly porous and covers only about 250 sq ft per gallon. For a house with 2,000 sq ft of exterior wall and 2 coats, you need approximately 16 gallons of paint plus 6 gallons of primer. Always buy extra — brick varies in porosity.
Do I need primer for exterior painting?
Yes, primer is essential for exterior surfaces. It seals the surface, improves paint adhesion, and extends the paint lifespan. This is especially important for bare brick, stucco, and wood. The calculator includes a separate primer estimate based on 350 sq ft per gallon coverage.
What is the best paint for stucco exteriors?
Elastomeric paint is ideal for stucco because it fills hairline cracks and flexes with temperature changes. Stucco covers only 200 sq ft per gallon due to its texture and porosity, so plan for significantly more paint than smooth surfaces.
How long does exterior paint last?
Quality exterior paint lasts 7-15 years depending on climate, surface preparation, and sun exposure. Brick and stucco tend to hold paint longer than wood, which can expand and contract with moisture. Using a quality primer extends lifespan by 2-3 years.
Last updated: 2026-10-06
Disclaimer: This calculator provides an estimate based on standard paint coverage rates. Actual coverage varies by surface texture, paint brand, application method, and environmental conditions. Always buy 10-15% extra paint for touch-ups and re-verify coverage rates on your paint can label.