🎨 Paint Calculator

What is Paint Calculator?

Paint Calculator tells you exactly how much paint you need for any room. Enter the room dimensions, count of doors and windows, and the number of coats — it estimates the paintable wall area and gallons required.

How to Use Paint Calculator

1. Enter room length, width, and ceiling height
2. Count the doors and windows in the room
3. Choose how many coats you plan to apply
4. See the paintable area and gallons of paint needed

Why Use Our Paint Calculator?

• No more buying too much or too little paint
• Accounts for doors, windows, and number of coats
• Shows both gallons and liters
• Saves money on a DIY painting project

Common Use Cases

• Painting a bedroom or living room
• Planning a repaint with multiple coats
• Estimating paint for a landlord or contractor

Worked Example

Enter a 12×14 ft bedroom with 8 ft ceilings, one door, one window, and two coats. The tool computes 416 sq ft of wall area, subtracts the 36 sq ft of openings, and returns 380 sq ft of paintable area needing about 2.17 gallons (8.2 liters). Buy to that figure instead of guessing: at roughly 350 sq ft of coverage per gallon per coat, a two-coat job on that room needs just over two gallons, so a third can stays unopened for touch-ups later.

Frequently Asked Questions

• How much area does a gallon cover?▾
  A standard gallon covers about 350 sq ft with one coat. Your total accounts for doors, windows, and the number of coats.
• Do I include the ceiling in the estimate?▾
  This calculator estimates wall area from length, width, and ceiling height, then subtracts doors and windows. If you are painting the ceiling too, add the room's floor area as a separate calculation and include it in your gallon total.
• Why do doors and windows reduce the amount?▾
  You are not painting those surfaces, so their area is subtracted from the wall total before converting to gallons. Count standard interior doors and double-hung windows as you measure them for the most accurate result.