Stop losing money on underestimated jobs. This calculator includes the hidden costs that eat into contractor profits.
Total floor area of rooms to paint
Our professional wall paint calculator uses industry-standard formulas to provide accurate painting estimates:
Several factors can impact your final painting quote:
| Room Type | Size (sq ft) | DIY Cost | Professional Cost | Time (hours) |
|---|---|---|---|---|
| Bedroom | 12x12 | $150-250 | $400-800 | 4-6 |
| Living Room | 15x20 | $300-400 | $800-1,600 | 8-10 |
| Kitchen | 10x12 | $150-200 | $350-700 | 3-5 |
| Bathroom | 8x10 | $100-150 | $250-500 | 2-4 |
| Whole House Interior | 2,000 | $1,200-2,000 | $3,000-8,000 | 24-40 |
| Exterior House | 2,500 | $1,500-2,500 | $3,000-7,000 | 20-35 |
Most calculators use 1990s coverage rates (400 sqft/gallon) when modern paints actually cover 320-350 sqft. They ignore waste factors, multiple coats, and primer needs. Result: you buy less paint than the job needs and end up short. This calculator uses real, current coverage rates and adds a waste factor automatically.
They measure floor area instead of WALL area. A 20x30 room isn’t 600 sqft of walls - it’s 800+ sqft (perimeter x height). Miss this and you’re short 6 gallons of paint, plus labor costs explode when you have to return. Our calculator prevents this costly amateur mistake automatically.
Professional presentation. A scribbled estimate on notebook paper vs. a detailed breakdown showing prep work, materials, labor, and timeline. Psychology: detailed estimates appear more valuable. Our calculator creates professional breakdowns that justify premium pricing.
Underestimate the gallons on a job and you can run out mid-project. If the color has to be re-matched or the batch changes, you lose time and money going back for more. Don't guess. This calculator includes a 15% waste factor automatically so you order enough the first time.
Painting estimate examples vary due to: paint quality ($15-100/gallon), labor rates ($20-75/hour), prep work requirements, surface conditions, accessibility, timeline, and contractor overhead. Premium services include better warranties and insurance.