Calculate Paint Needed
Enter room dimensions and paint specifications to calculate gallons required.
Paint Calculation Results
Total Paintable Area
After subtracting doors/windows
0 sq ft
Gallons Needed
Total gallons required
0 gallons
Quarts Needed
For touch-ups
0 quarts
Paint Cans to Buy
Recommended purchase
0
Paint Types Recommendation
Walls
Eggshell or Satin finish
0 gal
Ceiling
Flat white
0 gal
Trim
Semi-gloss
0 gal
Cost Estimate
$
$
Paint Cost:
$0.00
Primer Cost:
$0.00
Estimated Total:
$0.00
Paint Calculator Guide: Professional Painting Tips
Proper paint estimation prevents wasted money and multiple trips to the store. This guide covers everything from surface preparation to finish selection.
Paint Coverage by Surface Type
| Surface Type | Coverage per Gallon | Primer Needed | Notes |
|---|---|---|---|
| Smooth Drywall | 350-400 sq ft | Yes, on new drywall | Best coverage, easiest to paint |
| Textured Drywall | 300-350 sq ft | Recommended | Texture absorbs more paint |
| Brick/Concrete | 250-300 sq ft | Required | Use masonry primer first |
| Unfinished Wood | 200-250 sq ft | Required | Oil-based primer recommended |
| Previously Painted | 350-400 sq ft | Depends on color change | Clean and sand lightly |
When to Use Primer
- Always prime: New drywall, unpainted wood, stained surfaces
- Recommended: Changing from dark to light colors, covering stains
- Optional: Repainting similar colors on clean, painted surfaces
- Special primers: Stain-blocking (for water marks), bonding (for glossy surfaces)
Paint Finish Guide
- Flat/Matte: No sheen, hides imperfections, not washable - use on ceilings
- Eggshell: Low sheen, washable, hides imperfections - ideal for walls
- Satin: Soft sheen, very washable - good for bathrooms, kitchens
- Semi-Gloss: Shiny, very durable and washable - perfect for trim, doors
- Gloss: Very shiny, shows imperfections - use on furniture, cabinets
Frequently Asked Questions
How do I calculate paint for multiple rooms?
Calculate each room separately, then add totals. Different rooms may need different paint types (e.g., bathroom vs bedroom).
Should I buy paint by gallon or quart?
Gallons are cheaper per ounce. Buy quarts only for small areas (< 100 sq ft) or for trim paint. Always buy extra for touch-ups.