Flooring Calculator
Calculate how much flooring material you need for any room.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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Request a ToolHow to Use the Flooring Calculator
This calculator takes your room dimensions and gives you the exact amount of flooring material to buy, including waste. Follow these steps to get an accurate estimate:
- Enter the room length and width in feet. Measure to the longest points in each direction. For L-shaped or irregular rooms, break the space into rectangles and add the results together.
- Set a waste factor. The default is 10%, which covers cuts, mistakes, and future repairs. For rooms with diagonal or herringbone patterns, use 15%. For simple straight-lay installations in a rectangular room, 5-7% may be sufficient.
- Enter the square feet per box. Check the flooring box or product listing for this number. Hardwood planks, laminate, and luxury vinyl tile (LVT) are typically sold in boxes covering 15-25 sq ft. The default is 20 sq ft/box.
- Add a price per square foot (optional). Enter the cost of the flooring material to get an estimated total cost. This covers material only, not labor or underlayment.
Results update instantly as you type. Use the Share button to generate a pre-filled link to send to a contractor or store associate, or Copy to paste the result into a notes app or message.
About the Flooring Calculator
Buying flooring requires calculating more than the raw room area. Every installation produces off-cuts from fitting around walls, doorways, and obstacles. Those offcuts cannot be reused, so you must account for them upfront. The waste factor is a percentage added on top of the measured area to cover this material loss.
A 10% waste factor is the industry-standard recommendation for most straight-lay hardwood, laminate, and LVT installations. Pattern matching (like wood grain or tile grout lines) and diagonal layouts increase cuts and waste, pushing the recommended factor to 15% or higher. Buying slightly too much is far better than running short, since flooring materials can be discontinued or dye-lot variations can make reorders visible.
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Frequently Asked Questions
How much extra flooring should I buy for waste?
The standard recommendation is 10% extra for most installations. Use 5-7% for a simple rectangular room with straight-lay planks and no pattern matching. Use 15% for diagonal or herringbone layouts, rooms with many corners or obstacles, or patterned tile where you need to align grout lines. Buying a little extra also gives you material for future repairs if a plank is damaged.
How do I measure an L-shaped or irregular room?
Divide the room into rectangles. Measure each rectangle separately, calculate the area of each (length times width), then add them together. Enter that total into the length field with a width of 1, or split the calculation across two uses of this tool and add the box counts. When in doubt, it is better to slightly overestimate each section than to undercount.
What does "sq ft per box" mean and where do I find it?
Flooring is sold in boxes that contain enough planks or tiles to cover a specific area. This coverage is listed on the box or in the product specifications online, usually as "coverage" or "sq ft per carton." Common ranges are 15-25 sq ft for hardwood and laminate, and 10-20 sq ft for ceramic tile. Always use the exact number from your specific product to get an accurate box count.
Does the cost estimate include installation labor?
No. The cost estimate covers flooring material only, based on the price per square foot you enter. It does not include labor, underlayment, adhesive, transition strips, baseboards, or disposal of old flooring. Professional installation typically adds $2-$8 per square foot depending on material type and region. Get quotes from local contractors for a complete project budget.