GUIDE CATEGORY
Painting & Walls guides
Paint, primer, drywall and wallpaper: how to measure walls and ceilings and how much to buy.
Guide
Estimating Ceiling and Trim Paint
Estimate ceiling paint for flat and sloped ceilings and trim paint for baseboards, casings and doors. Linear-foot method, worked room example, whole-house approach and metric units.
Guide
How Much Paint Do You Need for a Room? A Step-by-Step Method
Calculate wall paint for any room - measure, subtract doors and windows, multiply by coats and divide by coverage. Worked 12 x 14 ft example, room-size table and metric conversions.
Guide
Primer and Number of Coats: How to Plan Your Paint Job
When you need primer and when you can skip it, how many coats each situation takes, primer coverage, and a worked new-drywall example with gallons for primer and paint.
Calculators for these projects
- Paint Calculator →Calculate paint for walls and ceilings. Subtract doors and windows, adjust coats and coverage, and compare whole gallons with gallons plus quarts.
- Baseboard & Trim Calculator →Turn room size into linear feet of baseboard, minus door openings, plus a cutting allowance, then count whole 8, 12 or 16 ft boards.