How to Use the Paint Coverage Calculator
This calculator is designed to provide immediate answers without manual arithmetic or confusing steps. Simply input your values into the fields above; results update automatically as you adjust numbers. You can also customize your currency and tax preferences using the region selector in the header.
Formula & Calculation Method
Wall Area = 2 × (Length + Width) × Height; Paintable Area = Wall Area - (Doors + Windows); Gallons = (Paintable Area × Coats) ÷ 350 sq ft/gal
Our algorithms strictly follow standard international accounting, scientific, and engineering formulas to ensure 100% precision.
Frequently Asked Questions
How much wall area does 1 gallon or 1 liter of paint cover?
One US gallon covers approximately 350 to 400 square feet (32-37 sq meters) for one coat. 1 liter covers roughly 10-12 sq meters.
Do I always need two coats of paint?
Two coats are strongly recommended for durability, uniform sheen, and proper color depth, especially when painting over darker colors or fresh drywall.