Paint Calculator
Estimate exact gallons needed for walls, ceilings and trim. Save money and avoid waste.
Paint Calculation Results
Enter dimensions to calculate paint requirements.
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How to Use the Paint Calculator
This tool helps you estimate the exact amount of paint needed for your project:
- Select Surface Type: Choose between walls, ceiling or trim
- Enter Dimensions: Input length, width and height
- Add Openings: Include doors and windows to subtract from total area
- Calculate: Get exact gallons needed based on surface type
Paint Coverage Guide
| Surface Type | Sq. Ft. per Gallon | Notes |
|---|---|---|
| Walls (smooth) | 350-400 sq. ft. | Standard interior walls |
| Walls (textured) | 300-350 sq. ft. | Orange peel, knockdown, etc. |
| Ceilings | 250-300 sq. ft. | May require more coats |
| Trim/Doors | 200-250 sq. ft. | Detailed surfaces require more paint |
Why Calculate Paint Quantity?
- ✅ Save Money: Buy only what you need
- ✅ Reduce Waste: Avoid leftover paint
- ✅ Better Planning: Complete project in one go
- ✅ Accurate Budgeting: Know costs before starting
- ✅ Environmental Impact: Reduce chemical waste
People Also Search For
How much paint do I need for a 12x12 room?
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For a 12x12 room with 8-foot ceilings, you'll need approximately 1.5-2 gallons for walls with two coats. This includes painting the walls but not the ceiling or trim.
How to calculate paint for multiple rooms?
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Calculate each room separately using our calculator, then add the results together. Remember to account for different surface types and colors that might require separate paint batches.
Does ceiling paint cover better than wall paint?
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Ceiling paint is typically thicker and more viscous to prevent drips. It often has better coverage per gallon but may require specialized application techniques.
How much extra paint should I buy for touch-ups?
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It's recommended to keep 10-15% extra paint for future touch-ups. Store it in a sealed container away from temperature extremes.
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