Flooring Calculator
Estimate how much flooring material to buy for your rooms, with a built-in waste allowance for cuts and mistakes.
Result
Enter your numbers to see the estimate.
How this calculator works
Flooring is sold by the square foot (or square meter), but you should never buy the exact amount your room measures. Cutting boards or tiles to fit around corners, doorways and edges always creates offcuts you can't use, so contractors and flooring retailers recommend adding a waste allowance — typically 10% for most materials.
This calculator multiplies your room's length and width to get the base area, multiplies by the number of rooms you're flooring with the same material, then adds your chosen waste percentage to give you a realistic purchase quantity. Straight-lay patterns can often get away with 5-7% waste, while diagonal layouts, herringbone patterns or rooms with lots of angles and alcoves may need 15% or more.
The material you choose changes a few practical details, even though the area math stays the same: hardwood and laminate are usually sold by the box (check the box coverage in sq ft), carpet is typically sold by the roll width, and tile is sold by the piece or by the box — see our dedicated tile calculator for exact tile counts.
Example: A 15 ft × 12 ft living room (180 sq ft) with 10% waste needs about 198 sq ft of flooring material.
How it works
Enter your measurements or costs
Fill in the room size, materials or costs for your project. No sign-up required.
Adjust the settings
Choose your units, waste percentage and any project-specific options.
Get your estimate instantly
See your results calculated instantly, right in your browser.
Frequently asked questions
How much flooring should I buy?
Measure your room's area in square feet, then add a waste allowance — typically 10% — to cover cuts, mistakes and pattern matching. This calculator does that math for you.
What waste percentage should I use for flooring?
10% is a safe default for most rectangular rooms. Use 5-7% for very simple, straight-lay rooms, and 15%+ for diagonal layouts or rooms with many corners.
Does the flooring type change how much I need?
The area calculation is the same regardless of material, but purchase units differ — hardwood and laminate are sold by the box, carpet by the roll, and tile by the piece. Check your product's coverage per box or roll.
Should I measure each room separately?
For best accuracy, measure each room and add them together, especially if rooms are irregular shapes. This calculator lets you multiply one room size by a room count if your rooms are similar in size.
Can I use these calculators on my phone?
Yes, all HomeCalc calculators are fully responsive and work on phones, tablets and desktops.