Should I subtract doors and windows?

For a more precise estimate, subtract door and window area from total wall area before dividing by coverage.

Paint Calculator

Estimate the amount of paint needed based on wall area and typical paint coverage, including a second coat.

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Results

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Formula

Gallons = (Perimeter × Height × Coats) / Coverage per Gallon

How to Estimate Materials for Any Home Project

The volume and area math behind concrete, paint, flooring, and tile estimates — with real project numbers.

Planning a Home Renovation: Estimating Materials Before You Get a Quote

A walkthrough of estimating flooring, tile, and paint quantities for a renovation project before contacting a contractor.

Concrete Calculator

Calculate how much concrete you need for a slab, in cubic yards.

Flooring Calculator

Calculate how many boxes of flooring you need for a room.

Gravel Calculator

Calculate how many tons of gravel you need for a driveway or path.

Roofing Calculator

Estimate the number of roofing squares and shingle bundles needed.

Brick Calculator

Estimate how many bricks you need for a wall.

Fence Calculator

Calculate how many fence posts and panels you need for a perimeter.