Learn how much paint you need — and how to apply it well
Start with the calculation, then get the tools and techniques that make the job look right the first time.
How to Choose Paint Finish
Flat, eggshell, satin, semi-gloss — which sheen goes on walls, ceilings, and trim.
When Do I Need Primer?
New drywall, stains, color changes — and how primer affects gallons.
How to Calculate Paint
Step-by-step formula: wall area, doors, windows, coats, and coverage rates.
Paint Coverage Rates
Sq ft per gallon by paint type — the numbers our calculators use.
Painting Supplies Checklist
What to buy after you know your gallon count — brushes, rollers, tape, and more.
Tools You Need to Paint
Rollers, brushes, tape, drop cloths, and what is optional vs essential.
Painting Techniques
Prep, cutting in, rolling, coats, and drying times for a pro-looking finish.
Paint Types & Coverage Database
Technical coverage rates, dry times, and specs by paint type.
Paint Calculator FAQ
Common questions about gallons, coats, ceilings, and coverage.
Ready to get your gallon count?
Use the free calculator, then optionally email yourself an advanced recommendation with product options.
Open Quick Calculator