How to use it
- Enter the total wall length in feet.
- Enter the wall height in feet.
- Enter the number of coats you plan to apply.
- Read the gallons needed and total wall area results.
Your paint project starts with two numbers: how much surface you’ll cover and how many coats you plan. This calculator takes the wall length, height, and coat count you enter, then instantly shows the total square‑foot area and the gallons of paint required based on standard coverage. Knowing the exact gallons helps you avoid extra trips to the store, reduces waste, and keeps your budget on track. The wall area figure lets you verify measurements, while the gallons result tells you how many containers to order. No guesswork, no hidden fees—just a clear, actionable estimate you can trust before you buy a single can. If you’re painting multiple rooms, simply repeat the steps for each space and add the results for a full‑home estimate. The tool also works for ceilings or exterior trim, as long as you input the correct dimensions and coat count.
Pro tips
- Add about 10% extra paint for waste and touch‑ups.
- Round up the gallon result to the nearest whole gallon before ordering.
- Purchase one extra gallon for future repairs or small areas.
- Measure around windows and doors, then subtract their area from the total.
Real-life examples
- Homeowner repainting a living room and wants to know exact paint quantity.
- DIY landlord estimating paint for a rental turnover to stay within budget.
- Contractor preparing a bid for a small office remodel and needs a quick material estimate.
Case study
Sara wanted to repaint her 12‑ft by 10‑ft bedroom with two coats. Using the calculator, she saw she needed 1.2 gallons and ordered two one‑gallon cans, saving a trip back to the store and staying within budget.