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Paint Calculator 🎨
Quickly estimate how much paint you need for any room, accounting for doors, windows, and multiple coats. Get results in gallons or liters with smart coverage estimates.
Paint Calculator 🎨
Room Paint Planning
Room Dimensions
Length × Width × Height
Doors
Auto-subtracted
Windows
Auto-subtracted
Coats
1-5 layers
About Paint Calculator 🎨
Paint Your Room with Precision
Enter your room dimensions, doors, and windows to instantly calculate the exact amount of paint you need. The Paint Calculator helps homeowners, painters, and DIY enthusiasts avoid waste and ensure perfect coverage with accurate gallon and liter estimates.
Smart Area Calculation
Automatically calculates wall area and subtracts doors and windows for accurate coverage.
Multi-Coat Support
Account for primer and multiple finish coats to get the total paint quantity needed.
Dual Unit System
Get results in both US gallons/quarts and metric liters for any paint brand.
How to Use the Paint Calculator
Enter the length, width, and height of your room in feet or meters. Specify the number of doors and windows to subtract their area from the total wall surface. Select how many coats you plan to apply (typically 2 for best coverage). The calculator uses industry-standard coverage rates to estimate the gallons or liters of paint you'll need.
Professional Painting Tips
- Always buy 10-15% extra paint to account for touch-ups, uneven surfaces, and future repairs.
- Primer coats may require different coverage rates than finish coats—check manufacturer specifications.
- Textured walls, porous surfaces, and dark-to-light color changes may need additional paint.
- Keep paint from the same batch to ensure consistent color matching across all walls.
Paint Coverage Reference
| Paint Type | Coverage (per gallon) | Coverage (per liter) | Best For |
|---|---|---|---|
| Primer | 300-350 sq ft | 8-10 m² | New drywall, stain blocking, dark-to-light changes |
| Interior Paint (Flat/Matte) | 350-400 sq ft | 10-12 m² | Ceilings, low-traffic areas, bedrooms |
| Interior Paint (Satin/Eggshell) | 350-400 sq ft | 10-12 m² | Living rooms, dining rooms, hallways |
| Interior Paint (Semi-gloss/Gloss) | 300-350 sq ft | 8-10 m² | Kitchens, bathrooms, trim, doors |
Reference this content, page, or tool as:
"Paint Calculator 🎨" at https://MiniWebtool.com/paint-calculator/ from MiniWebtool, https://MiniWebtool.com/
by miniwebtool team. Updated: Oct 16, 2025