Paint Cost Calculator
Calculate total paint cost for your room including gallons needed.
Last updated: June 13, 2026
Calculator
Results
How to Use This Calculator
- 1Enter room length and width.
- 2Enter ceiling height.
- 3Enter paint price per gallon.
- 4Enter number of coats.
- 5View gallons needed and total cost.
Formula Explanation
Paint coverage is approximately 350 sq ft per gallon. Wall area is calculated from perimeter and height, minus 15% for windows/doors.
Variables:
Worked Examples
14×12 ft room, 8ft ceilings, $35/gal, 2 coats
- 1. Wall area = 2×(14+12)×8 = 416 sq ft
- 2. Adjusted (85%): 354 sq ft
- 3. With 2 coats: 707 sq ft
- 4. Gallons = 707/350 = 2.02 → 3 gallons
Why Use This Calculator
- Know exactly how much paint to buy.
- Budget accurately for your project.
- Avoid multiple trips to the store.
- Accounts for windows and doors.
Tips & Best Practices
- One gallon of paint covers approximately 350-400 sq ft on smooth surfaces.
- Textured walls and dark-to-light color changes may need 3 coats.
- Buy all paint from the same batch for consistent color.
- Keep leftover paint for touch-ups — label cans with room and date.
Common Mistakes to Avoid
❌ Buying too little paint and running out mid-wall.
✅ Always round up to the next full gallon. It's better to have leftover paint for future touch-ups than to run out and risk color mismatch.
❌ Not accounting for the number of coats.
✅ Most paint jobs need 2 coats. Going from dark to light may require a primer plus 2 coats.
Frequently Asked Questions
How much does a gallon of paint cover?
How much does it cost to paint a room?
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<iframe src="https://redicalc.com/embed/home/paint-cost-calculator" width="100%" height="600" style="border:none;border-radius:12px;box-shadow:0 1px 3px rgba(0,0,0,0.1);" title="Paint Cost Calculator — RediCalc.com" loading="lazy" allowtransparency="true"></iframe>Disclaimer: This calculator is provided for informational and educational purposes only. Results are estimates and should not be used as a substitute for professional advice. RediCalc.com makes no guarantees regarding the accuracy, completeness, or suitability of any calculations. Always consult a qualified professional before making financial, health, construction, or other important decisions.
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