Paint Calculator
Estimate how much paint you need for a room, wall, or makeover, including doors, windows, coats, and coverage.
Paint Estimation
This calculator auto-updates when values change.
Paintable area
349 sq ft
Total coverage
698 sq ft
Exact need
1.99 gallons
Suggested purchase
2 gallons
Disclaimer: This property and construction calculator provides an estimate only. Actual material requirements can vary based on site conditions, product specifications, installation method, waste, and local building requirements. Confirm quantities with your contractor or supplier before ordering.
About This Paint Calculator
This paint calculator estimates paintable area and suggested paint purchase quantity for rooms and feature walls.
It accounts for room dimensions, doors, windows, number of coats, and the coverage rate listed on your paint can.
How to Use This Calculator
- 1
Choose full room or single wall
Use full room for all four walls or single wall for a feature wall.
- 2
Enter dimensions
Add length, width, and height in feet.
- 3
Subtract openings
Enter doors and windows so their average area is deducted.
- 4
Set coats and coverage
Use your paint label coverage and number of coats to estimate gallons to buy.
Frequently Asked Questions
How much paint do I need for a 12x12 room?v
A typical 12x12 room with 8-foot walls and two coats often needs about 2 gallons, depending on doors, windows, and paint coverage.
Does this include the ceiling?v
No. This calculator estimates wall paint only unless you include ceiling area manually.
Should I buy extra paint?v
Yes. Rounding up helps cover touch-ups, roller loss, surface texture, and small measurement differences.