Hardwood Flooring Calculator
Use this free hardwood flooring calculator to find exactly how much flooring to buy for your room: enter the length and width, add a waste allowance for cuts and mistakes, and optionally enter the price per square foot to get a total cost estimate. Results update instantly as you type.
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Measure the room in feet. Results update as you type.
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How to use this calculator
Measure the room's length and width in feet and enter them — measure the longest points of the floor, and for L-shaped rooms, split the area into two rectangles and use the calculator for each. Enter your waste allowance (10% is the standard default for straight-lay installs) and, if you want a budget number, the price per square foot from your flooring store.
Results recalculate instantly as you type, or press Calculate to recompute on demand. The tool shows your room's area, the square footage to buy including waste, and — when a price is entered — an estimated material cost. No sign-up, no downloads, and it works on any phone or computer.
How it works
The math is simple and honest. First, room area = length × width in square feet. Then, square feet to buy = room area × (1 + waste % ÷ 100) — the waste allowance covers end cuts, boards that don't fit, and a small buffer for repairs later. If you enter a price, estimated total cost = square feet to buy × cost per sq ft.
For example, a 12 × 15 ft room is 180 sq ft; with a 10% waste allowance you should buy 180 × 1.10 = 198 sq ft. If the flooring costs $8 per sq ft, the estimated material cost is 198 × $8 = $1,584.
The waste figure is an estimate: use 10% for straight installs and 15–20% for diagonal or patterned layouts. The cost figure is a material-only estimate — it does not include labor, underlayment, trim, stairs, or tax, so confirm final numbers with your supplier or installer.
Frequently asked questions
How much hardwood flooring do I need?
Measure the room's length and width in feet, multiply them to get the square footage, then add a waste allowance (usually 10%). For example, a 12 × 15 ft room is 180 sq ft; with 10% waste you should buy 198 sq ft. This calculator does that math for you instantly.
What waste percentage should I use for hardwood flooring?
For most straight-lay installations, 10% waste is the standard allowance and covers end cuts, mistakes, and future repairs. If you install on a diagonal or in a pattern like herringbone, use 15–20% instead, since angled cuts waste more material.
How is the flooring cost estimated?
The cost estimate multiplies the square footage to buy (room area plus waste) by the price per square foot you enter. It covers material only — labor, underlayment, trim, and taxes are not included, so treat it as a budget estimate, not a final quote.
Do I need to measure in square feet or square yards?
Hardwood flooring is priced and sold by the square foot, so measure in feet. If you only know the area in square yards, multiply by 9 to convert to square feet before entering it into the calculator.