Flooring Calculator
Calculate flooring material needed for one or more rooms. Set waste factor and cost per square foot for a complete estimate.
Quick Answer
Multiply room length by width to get square footage. Add 10% for waste on standard installs or 15% for diagonal patterns. A 12x10 room needs 120 sq ft of flooring, or 132 sq ft with 10% waste (about 7 boxes at 20 sqft/box).
Flooring Estimate
About This Tool
The Flooring Calculator determines how much flooring material you need for one or more rooms. It accounts for waste from cuts and mistakes, calculates total cost at your specified price per square foot, and estimates the number of boxes you need to purchase. Getting the right amount of flooring before starting your project avoids the frustration of running short (and potentially getting a different dye lot) or the waste of buying too much.
Why Waste Factor Matters
Every flooring installation produces waste. When you cut a plank to fit at the end of a row, the remaining piece may be too short to start the next row. Rooms have closets, doorways, and angled walls that create odd cuts. Some planks may arrive damaged in the box. The standard 10% waste factor covers these scenarios for a simple rectangular room. If you are installing a diagonal or herringbone pattern, increase to 15% because these patterns create more angled cuts with less reusable offcuts. For L-shaped rooms or rooms with many obstacles, 15-20% is safer.
Types of Flooring
Laminate flooring is the most affordable option at $1-$5 per square foot. It consists of a photographic image layer over fiberboard and clicks together as a floating floor. Luxury vinyl plank (LVP) costs $2-$7 per square foot and is waterproof, making it suitable for kitchens, bathrooms, and basements. Engineered hardwood ($3-$10/sqft) has a real wood veneer over plywood layers and provides the look of hardwood with better moisture resistance. Solid hardwood ($5-$15/sqft) is the premium option that can be sanded and refinished multiple times over its 50-100 year lifespan.
Measuring Irregular Rooms
For rooms that are not rectangular, break them into rectangles and measure each section separately. An L-shaped room becomes two rectangles. A room with a bay window can be measured as a rectangle plus a triangle (length times width divided by 2 for the triangular part). For closets, measure their floor area and add it to the room total. This calculator lets you add multiple rooms to handle these situations. When in doubt, measure each distinct section as its own room entry and let the calculator add them up.
Installation Tips
Acclimate your flooring in the room where it will be installed for at least 48 hours before installation. This allows the material to adjust to the room's temperature and humidity, preventing gaps or buckling after installation. Always leave a 1/4-inch expansion gap around all walls and fixed objects (this will be covered by baseboards). Start your first row along the longest, most visible wall. Stagger end joints by at least 6 inches between adjacent rows for structural strength and a more natural appearance. Use a tapping block and pull bar to avoid damaging plank edges during installation.