Use this calculator to estimate the amount of paint you'll need for your room and the approximate cost. Accurate measurements will help you avoid buying too much or too little paint.
(Typical: 300-400 sq ft/gallon per coat)
Obstructions (Doors & Windows)
Enter the number and average dimensions of doors and windows to subtract their area from the total.
Cost Estimation
Your Paint Estimate:
Enter your details and click "Calculate" to see your estimate.
Understanding Your Paint Needs: A Comprehensive Guide
Painting a room can dramatically transform its look and feel, but accurately estimating the amount of paint required is crucial for a smooth project. Buying too little means inconvenient trips back to the store, while buying too much leads to wasted money and storage issues. Our Paint Estimate Calculator is designed to simplify this process, providing you with a precise estimate based on your room's specific dimensions and other key factors.
How the Paint Estimate Calculator Works
Our calculator takes into account several variables to give you the most accurate estimate:
Room Dimensions: You'll input the length, width, and height of your room in feet. The calculator uses these to determine the total square footage of your walls.
Number of Paint Coats: Most painting projects require at least two coats for optimal coverage and color depth. The calculator multiplies the paintable area by the number of coats you plan to apply.
Paint Coverage (sq ft per gallon): This is a critical factor. Paint cans typically specify the coverage rate, usually ranging from 300 to 400 square feet per gallon for a single coat. Factors like paint quality, color, and wall surface texture can influence this. A rougher surface or a drastic color change (e.g., dark to light) might require more paint or a lower coverage rate.
Obstructions (Doors & Windows): To avoid overestimating, the calculator allows you to subtract the area of doors and windows. You'll input the number and average dimensions of these features.
Cost Per Gallon: For a complete budget, you can enter the average cost of your chosen paint per gallon. This helps you estimate the total material cost for your project.
Key Factors Influencing Paint Quantity
Surface Condition: Porous surfaces (like new drywall or unprimed plaster) will absorb more paint than previously painted, smooth surfaces. You might need an extra coat or a primer.
Color Change: Painting a light color over a dark one, or vice-versa, often requires more coats to achieve full opacity and true color.
Paint Quality: Higher quality paints often offer better coverage per coat, potentially reducing the number of coats needed.
Application Method: Spraying paint typically uses more paint than rolling or brushing, as some paint is lost to overspray.
Tips for a Successful Painting Project
Measure Twice: Double-check all your room dimensions, door, and window measurements to ensure accuracy.
Consider Primer: If you're painting new drywall, making a significant color change, or dealing with stains, a good quality primer can improve adhesion, coverage, and the final look, potentially reducing the number of topcoats needed.
Buy a Little Extra: It's always a good idea to buy slightly more paint than the calculator suggests (e.g., an extra quart or half-gallon if your estimate is close to a full gallon). This ensures you have enough for touch-ups later and avoids color matching issues if you run out mid-project.
Ventilate Properly: Ensure good airflow in the room while painting and drying to help with fumes and drying time.
Prepare the Surface: Clean walls, fill holes, sand rough spots, and tape off trim for a professional finish.
By using this calculator and following these tips, you'll be well-prepared to tackle your next painting project with confidence and efficiency!