Paint Estimator

The Paint Estimator is designed to make calculations simple, fast, and reliable.

Key Benefits:

• Fast and accurate computation

• 100% free with no sign-up required

• Private and secure calculations handled directly in your browser.

To use the Paint Estimator, enter your Unit System, Total Room Length / Perimeter, Wall Height and other values. The calculator instantly computes Total Wall Area, Net Paintable Area and more. Results update in real time as you change any input — no submit button needed.

How to Use This Calculator

Enter your Unit System — choose from Imperial (feet, inches), Metric (meters), Total Room Length / Perimeter (e.g. 40 in feet / meters), Wall Height (e.g. 9 in feet / meters), Number of Doors (e.g. 2 in doors), Number of Windows (e.g. 4 in windows), Number of Paint Coats — choose from 1 Coat, 2 Coats (Recommended), 3 Coats, Paint Coverage per Gallon (e.g. 350 in sq ft / gal), and Price per Gallon Paint (e.g. 45 in ). Measure twice before entering dimensions — small measurement errors scale up significantly in material estimates.

The Formula

The Paint Estimator uses standard formulas to compute accurate results based on your inputs. Simply enter your values and get instant answers.

Worked Example

For example, enter your values into the input fields above to calculate the exact Paint Estimator result automatically.

Understanding Your Result

Standard interior latex paint covers 350–400 sq ft per gallon for a single coat on smooth surfaces; add 20–25% for textured or porous surfaces. Two-coat applications are standard for full color changes; deep colors may need three coats. Subtract 20 sq ft per standard door and 15 sq ft per window. Paint quantities round up to the nearest full gallon — partial gallons are not returnable at most retailers.