Auto Paint Calculator

Car paint coverage calculation ensures you buy the right amount of paint for a complete, professional-quality finish — whether for spot repair, panel repainting, or a full-car respray.

Coverage Formula:

Paint Needed (oz) = Total Surface Area (sq ft) / Coverage Rate (sq ft/oz) × Number of Coats

Vehicle surface area benchmarks:

• Compact car (e.g., Honda Civic): ~175–200 sq ft
• Mid-size sedan (e.g., Camry): ~200–230 sq ft
• Full-size truck (e.g., F-150): ~260–300 sq ft
• SUV/Minivan: ~240–280 sq ft

Coverage rates by paint type (per wet coat):

Standard coat counts:

• Base coat: 2–3 coats
• Clear coat: 2–3 coats
• Primer (if repainting bare metal): 2–3 coats

The figures above are for un-reduced paint straight from the can. In practice base coat is thinned with reducer (often close to 1:1) before it sprays, so the ready-to-spray volume you actually load into the gun is roughly double the raw-paint number. This calculator skips the area math and works from typical ready-to-spray volumes by vehicle size, which is what you buy and mix.

Worked example — full repaint of a mid-size sedan (2 base + 2 clear): Base coat: 1.2 quarts per coat × 2 = 2.4 quarts Clear coat: 1.2 quarts per coat × 2 = 2.4 quarts Subtotal: 4.8 quarts, and with 15% for waste and overspray, about 5.5 quarts ready to spray. That reconciles with the raw-paint math above once you account for reduction.

Tips for accurate measurement:

• Multiply the square footage of each panel individually and sum them
• Doors, hood, roof, trunk lid, and quarter panels are the main areas
• Deep, dark colors (black, dark red) often require an extra base coat for uniform coverage
• Metallic and pearl finishes require careful flash time between coats — rushing causes mottling