Everyday Tools
Flooring Calculator
Work out how much flooring to order for a rectangular room, including extra for cuts and mistakes, in square feet, square yards and boxes.
Calculation inputs
Measure the room at its widest points. Box coverage is printed on the carton.
Results
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Complete the fields and select Calculate to show results here.
Estimates only. Confirm pattern and cutting allowances with the product instructions.
About this calculator
This tool works out how much flooring to order for a rectangular room, adding an allowance for cuts and mistakes. It gives the answer in square feet, square yards and full boxes so you can compare it with how the product is sold.
How the calculation works
- Room area = length × width
- Area needed = room area × (1 + waste % ÷ 100)
- Square yards = square feet ÷ 9
- Boxes = area needed ÷ sq ft per box, rounded up
Notes and assumptions
Carpet is often sold by the square yard, while plank, tile and laminate are usually sold by the box.
For L-shaped rooms, split the floor into rectangles, run each one and add the results.
How it works in plain English
Flooring covers a flat surface, so the starting point is the room's area: its length multiplied by its width, both in feet. That figure is exactly the floor you can see, with no allowance for anything going wrong.
In practice some material is always lost. Planks and tiles must be trimmed at the walls, around doorways and at the end of every row, and a few pieces arrive damaged or get cut wrong. The waste percentage adds that buffer on top of the room area. Around 10 percent suits a simple straight lay in a rectangular room, while diagonal layouts, herringbone patterns and rooms with many corners often need 15 percent or more.
Next, the padded area is divided by the coverage of one box, which is printed on the carton. Because you cannot buy part of a box, the count is rounded up to the next whole number. The tool also converts square feet to square yards by dividing by nine, since carpet and some sheet flooring are priced that way. If you enter a price per square foot, it multiplies that by the area the boxes actually cover, giving a material cost for the order.
The formula
- Room area = length × width
- Area needed = room area × (1 + waste % ÷ 100)
- Square yards = square feet ÷ 9
- Boxes = area needed ÷ sq ft per box, rounded up
Worked example
Suppose a living room measures 14 feet by 12 feet and you are laying laminate planks straight, with a 10 percent waste allowance. Each box of the chosen laminate covers 20 square feet.
The room area is 14 × 12, which is 168 square feet. Adding 10 percent gives 168 × 1.10, or 184.8 square feet of material needed. Dividing by nine shows this equals about 20.53 square yards.
Dividing 184.8 by 20 square feet per box gives 9.24 boxes. Since partial boxes are not sold, you would order 10 boxes, which together cover 200 square feet. At $3 per square foot, that order would cost about $600 before underlayment, trim and tools.
Common waste allowances by layout
| Layout or room type | Typical waste allowance |
|---|---|
| Straight lay, simple rectangle | 5–10% |
| Straight lay, many corners or closets | 10–15% |
| Diagonal lay | 15% |
| Herringbone or chevron | 15–20% |
| Large-format tile | 10–15% |
Source: general guidance found in flooring manufacturers' installation instructions; follow the figure given for your specific product.
Frequently asked questions
How do I measure a room that is not a rectangle?
Split the floor into simple rectangles, such as the main room plus an alcove, and measure each one separately. Run each rectangle through the tool, or add their areas together and enter the total as one room by using the combined length with a width of one. Adding all the pieces gives the full floor area.
Why does flooring need a waste allowance?
Every row ends with a cut piece, and edges around doorframes, vents and walls need trimming. Some offcuts are too short to reuse, and a few pieces may be chipped or warped in the box. The allowance makes sure you have enough to finish without a second trip, which also avoids colour differences between production batches.
What is the difference between square feet and square yards?
One square yard is a square three feet on each side, so it contains nine square feet. Carpet and some vinyl rolls are often priced per square yard, while hardwood, laminate and tile are usually priced per square foot. Dividing square feet by nine converts between the two so you can compare quotes fairly.
Should I keep leftover boxes?
Keeping one unopened box is a good habit. If a board is damaged later, you will have an exact match from the same production run. Shades and textures can vary noticeably between batches, and some products are discontinued after a few years, which makes finding identical replacements difficult.
Helpful next steps
- Paint Calculator — Work out how much paint the same room's walls need.
- Area Converter — Convert square feet to square meters or square yards for carton coverage.
- Length Converter — Switch room measurements between feet, inches and meters.
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