Paint Coverage Calculator

What is this calculator?

A paint coverage calculator answers the reverse question from a paint quantity calculator: how much wall area can a known amount of paint cover? Homeowners use it when they already have leftover paint, a partial can, or a fixed number of gallons and want to know whether it can cover a closet, accent wall, bedroom, or touch-up project.

How does this calculator work?

Step 1: enter the amount of paint available. Step 2: choose or enter the coverage rate per gallon or per liter. Step 3: the calculator multiplies paint quantity by coverage and shows the approximate surface area for one coat.

Formula

Example Calculation

Example: A homeowner has 1.5 gallons left from a living room project. If the paint covers 350 sq ft per gallon, coverage area = 1.5 x 350 = 525 sq ft for one coat. For two coats, plan around 262 sq ft of finished wall coverage before texture or touch-up loss.

Common Mistakes

• Using one-coat coverage for a two-coat repaint.
• Assuming old paint will cover patched or porous surfaces evenly.
• Ignoring how much paint has dried on the rim, tray, or roller.
• Using exterior paint coverage for an interior wall or the reverse.
• Forgetting that dark-to-light color changes may need primer or another coat.

Frequently Asked Questions