Paint Calculator

Calculate how much paint you need for your room or project with coverage rates, door/window deductions, and cost estimates.

Room Dimensions

OR enter total wall area directly
Enter the combined area of all walls you want to paint

Openings to Subtract

Doors Default: 21 sq ft (7' x 3')
Windows Default: 15 sq ft (5' x 3')

Paint Type & Coverage

Select a paint finish to set the coverage rate, or enter a custom value

Typical range: 300-400 sq ft per gallon

Number of Coats

Most projects need 2 coats. Use 3 for covering dark colors or high-traffic areas.

Price Estimate (Optional)

$

Paint Calculation Results

Gallons to Buy
0 gallons
Rounded up from 0.00 gallons
Total Wall Area
0
sq ft
Openings Subtracted
0
sq ft
Paintable Area
0
sq ft
Gallons Needed
0.00
exact

Alternatively: 0 quarts (4 quarts = 1 gallon)

Paint Reference Guide

Coverage by Paint Type

Finish Coverage Best For
Flat/Matte 400 sq ft/gal Ceilings, low-traffic
Eggshell 375 sq ft/gal Living rooms, bedrooms
Satin 350 sq ft/gal Family rooms, hallways
Semi-Gloss 325 sq ft/gal Kitchens, bathrooms
Gloss 300 sq ft/gal Trim, doors, cabinets

When to Use Primer

  • Painting new, unpainted drywall
  • Covering dark colors with light paint
  • Painting over stains or water damage
  • Switching from oil-based to latex paint
  • Painting over glossy or slick surfaces
  • Covering strong odors (smoke, pets)

Estimating Tips

  • Add 10% extra for waste, touch-ups, and uneven surfaces
  • Textured walls use 15-25% more paint
  • Porous surfaces (bare wood, plaster) need more paint
  • Dark-to-light color changes may need 3+ coats
  • Keep leftover paint for future touch-ups
  • One gallon typically covers a 10x10 ft room (1 coat)