Tools in This Collection
Flooring Calculator
Calculate flooring materials for hardwood, laminate, vinyl, or tile with waste factor
Tile Calculator
Calculate tile count, grout, and adhesive for any room layout
Carpet Calculator
Calculate carpet square footage, padding, and seam placement
Paint Calculator
Calculate gallons of paint needed per coat for walls and ceilings
Wallpaper Calculator
Calculate rolls of wallpaper needed with pattern repeat
Drywall Calculator
Calculate drywall sheets, screws, and joint compound for any room
Baseboard Calculator
Calculate linear footage of baseboard trim by room perimeter
Crown Molding Calculator
Calculate crown molding length and corner angles for any room
Subfloor Calculator
Calculate OSB or plywood sheets, fasteners, and adhesive for subfloor
Rug Size Calculator
Find the right rug size for your room and furniture layout
Epoxy Resin Calculator
Calculate epoxy resin quantities for floors, countertops, and coatings
Plan Your Flooring and Interior Materials Project
Interior material projects fail at the ordering stage — not the installation stage. Buying too little flooring mid-project means scrambling to match dye lots from the same production run. Buying too much ties up hundreds of dollars in returns you may not be able to make. These calculators give you accurate material counts before you walk into a showroom.
The Right Calculator Workflow for Common Projects
Start with the Subfloor Calculator for new construction or replacement subfloor — it estimates OSB or plywood sheets, fasteners, and adhesive before your finish floor goes in. Then use the Flooring Calculator for your finish material — hardwood, laminate, vinyl plank, or tile. It accounts for waste factor, box coverage, and installation pattern. For tile work, the Tile Calculator handles grout joint width and layout direction separately.
For wall work in the same room, the Paint Calculator converts wall area to gallons per coat. Planning to add shiplap or board-and-batten? Use the specific material calculator before painting — the wall finish goes after the paneling. The Drywall Calculator estimates sheets and fasteners before you frame out rooms or finish a basement.
Trim, Molding, and Finish Materials
Trim work is often underestimated. The Baseboard Calculator and Crown Molding Calculator calculate linear footage by room perimeter and account for corner angles. Both let you specify room dimensions and doorway subtractions to get accurate linear feet before ordering.
For carpet installation, the Carpet Calculator handles seam placement and pad separately. Rug sizing for furnished rooms uses the Rug Size Calculator to match standard rug dimensions to furniture layouts — important for choosing between a 5×8 and an 8×10 without measuring the room yourself.
Coverage Rates by Material Type
Paint coverage: one gallon covers approximately 350–400 sq ft per coat on smooth surfaces. Standard drywall sheets are 4×8 (32 sq ft). Flooring box coverage varies: hardwood 18–22 sq ft/box, laminate 20–28 sq ft/box, luxury vinyl plank 24–28 sq ft/box. Always use the waste factor fields in each calculator — 10% for straight-lay patterns, 15% for diagonal cuts, 20% for herringbone or complex layouts. Ordering correct amounts upfront saves return-trip time and ensures matching material from the same production batch.
Frequently Asked Questions
How do I calculate how much flooring I need for a room with irregular shapes?
Break the room into rectangles, calculate each section separately using the Flooring Calculator, then add the results. Always add 10–15% waste factor for cuts at walls and obstacles. For diagonal or herringbone patterns, use 15–20% waste since angled cuts produce more offcuts.
How much waste factor should I add when ordering flooring or tile?
Use 10% for straight-lay flooring and rectangular tile on simple rooms, 15% for diagonal patterns or rooms with lots of corners, and 20% for herringbone or complex layouts. For tile with large format tiles (18×18 or bigger), add an extra 5% because large cuts create more waste.
How many gallons of paint do I need for a room?
One gallon covers approximately 350–400 sq ft per coat on smooth drywall. Measure your wall area (perimeter × wall height), subtract door and window openings, then divide by 350 and round up. For new drywall or dark colors, plan for two coats — the Paint Calculator handles this automatically.
Do I need to start with a subfloor calculator before ordering finish flooring?
Yes, if you are doing new construction or replacing a damaged subfloor. The subfloor goes in first and must be correct before any finish floor material is installed. Use the Subfloor Calculator for OSB or plywood sheet counts, then use the Flooring Calculator once the subfloor is complete.