Stair Calculator
Steps, risers, stringer.
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Home & Garden
Flooring Calculator
Enter room size and waste to get the square footage and boxes of flooring to buy.
Boxes needed
—
Rounded up.
| Floor area | — |
|---|---|
| With waste | — |
| Total to buy | — |
| Boxes | — |
Show our math
Enter your figures above to see the step-by-step working.
Everything computed client-sideEverything computed client-side — nothing leaves this page
How the Flooring Calculator Works
Work out the floor area by multiplying length by width, then add a waste allowance — usually 10% for straight layouts and up to 15% for diagonal or patterned installs, to cover cuts, mistakes and future repairs. Divide by the square footage each box covers (printed on the label) and round up to whole boxes.
It works for laminate, vinyl, hardwood and tile. For rooms that aren’t rectangular, split them into rectangles, calculate each, and add the areas together before applying waste.
boxes = ceil(area × (1 + waste) ÷ coverage per box)
Frequently Asked Questions
How much flooring do I need?
Multiply room length by width for the area, add about 10% waste, then divide by the coverage per box and round up.
How much waste should I add?
About 10% for straight layouts, 15% for diagonal or patterned floors. More for lots of cuts around obstacles.
How do I measure an irregular room?
Break it into rectangles, calculate each area, add them, then apply the waste percentage to the total.
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