Paint Coverage Calculator
Calculate gallons of wall paint, trim paint, and primer for single or multi-room jobs. Adjusts for surface type, application method, and number of coats — with a material cost estimate for bidding.
Rooms
344 sq ft walls
Paint Prices (for cost estimate)
Results — 1 Room
Wall + Ceiling Area
344
sq ft
Wall Paint
2
gallons
Trim Paint
1
gallon
Primer
0
not needed
Material Shopping List
Pro Tips
- Buy by the 5-gallon bucket when you need 3+ gallons of the same color — typically saves 15-20% vs individual gallons.
- Add 10% for touch-upson production jobs where you'll return for final punch. Keep a labeled quart of each color for warranty callbacks.
- Ceiling paintis formulated thicker than wall paint to reduce drips. Don't substitute wall paint on ceilings — it splatters more and shows roller marks.
How to Use This Calculator
Add each room in the job, enter dimensions and openings. Select the surface type (this affects coverage rate and whether primer is needed). Choose your application method — spraying uses 15-25% more paint due to overspray. Toggle trim and crown molding if you're painting those too. Enter your paint prices per gallon for an accurate cost estimate.
Formula Used
Wall Area = 2 × (L + W) × H - (Doors × 21 sq ft) - (Windows × 15 sq ft). Trim Area = baseboard linear ft × 4in + casing linear ft × 3.5in. Paint Gallons = (Area × Coats × Method Multiplier) / Coverage Rate.
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Disclaimer
This calculator is for estimation purposes only. Results may vary based on local conditions, materials, and building codes. Always consult a licensed professional before making decisions based on these calculations. MyContractorTools is not responsible for any errors or omissions.