paint ক্যালকুলেটর
Estimate how much paint you need based on room dimensions and number of coats.
এই ক্যালকুলেটর কীভাবে ব্যবহার করবেন
- Room Length (ft) লিখুন
- Room Width (ft) লিখুন
- Wall Height (ft) লিখুন
- Number of Coats লিখুন
- গণনা করুন বোতামে ক্লিক করুন
- ক্যালকুলেটরের নিচে প্রদর্শিত ফলাফলটি পড়ুন
How to Calculate Paint Coverage
Standard interior paint covers approximately 350–400 sq ft per gallon (one coat). To find the area to paint: measure the perimeter of the room × ceiling height for walls, then subtract doors (~20 sq ft each) and windows (~15 sq ft each).
Example: a 12 × 14 ft room with 9 ft ceilings, 1 door, 2 windows: Perimeter = (12+14) × 2 = 52 ft. Wall area = 52 × 9 = 468 sq ft. Subtract 20 + 30 = 50 sq ft → 418 sq ft. At 400 sq ft/gallon, you need slightly over 1 gallon for one coat. For two coats: 2+ gallons.
Primer, Paint Types, and Finishes
Primer: Use when painting over fresh drywall, dark colors, or stains. Dramatically improves coverage and adhesion — one coat of primer + one coat of paint often beats two coats of paint alone.
Finishes: Flat/matte (hides imperfections, not washable — bedrooms); Eggshell (slight sheen, washable — living rooms); Satin (more sheen, very washable — hallways, kids rooms); Semi-gloss (high sheen, moisture resistant — bathrooms, kitchens, trim); Gloss (maximum durability — doors, furniture).
Pro Painting Tips
Always buy slightly more than calculated — nothing is worse than running out mid-wall. Paint can be stored for 2+ years sealed. Use the same batch (same lot number) for consistent color. Work top to bottom: ceiling first, then walls, then trim. Cut in (brush along edges) before rolling. Allow proper drying time between coats (typically 2–4 hours for latex, 24 hours for oil-based).
সর্বশেষ আপডেট: March 2026
Frequently Asked Questions
How many coats of paint do I need?
Two coats is standard for most paint jobs. One coat may suffice when repainting the same color. Three coats may be needed when painting white over a dark color or when dramatic color change. Primer counts as one of your coats if using paint+primer in one.
Latex vs oil-based paint: which should I use?
Latex (water-based): easy cleanup, fast drying, low VOC, flexible — best for walls, ceilings, and most interior surfaces. Oil-based: harder, more durable, slower drying, strong odor — best for high-traffic surfaces, metal, and exterior wood.
How do I calculate ceiling paint?
Simply measure the room dimensions: Length × Width = ceiling area in sq ft. A 12 × 14 ft room has a 168 sq ft ceiling. Divide by coverage (350–400 sq ft/gallon) = ~0.4–0.5 gallons. One gallon is usually plenty for an average room ceiling with one coat.