Flooring Calculator

Calculate flooring square footage with waste factor and estimated cost.

Room Shape

Length (ft)

Width (ft)

Waste % (recommended 10%)

Price per sq ft ($ optional)

DIY difficulty

ModerateTypical time: 1–2 weekends

›Subfloor must be flat and dry — fixing it adds time
›Cutting around door frames and obstacles is tricky
›Transitions between rooms need to be planned carefully

Must-have tools

Flooring nailer or click-lock spacersMiter sawTapping block and pull barMoisture meter

How to calculate flooring for any room

For a rectangular room, enter the length and width in feet. The calculator gives you square footage plus the waste factor.
For an L-shaped room, use the two-rectangle option: measure each section separately and add them together.
Set your waste percentage. Straight-lay floors need 5–10%; diagonal or herringbone patterns need 15–20% extra.
Enter the price per square foot to get a total material estimate. Don't forget to add underlayment, adhesive, and transition strips to your budget.

Common uses

Estimating hardwood, LVP, or laminate for a new install
Calculating tile or carpet square footage for a remodel
Getting a material cost estimate before calling a contractor

Frequently asked questions

How much extra flooring should I buy?

Buy 10% extra for straight installations and 15% for diagonal or pattern layouts. Keeping a few spare planks lets you patch damaged boards years later with a matching batch.

How do I measure an L-shaped or irregular room?

Break it into rectangles. Measure each rectangle separately, calculate the square footage of each, then add them together. Add your waste percentage on top of the total.

Should I measure in feet or meters?

Use whatever your flooring is sold in. Most North American products are priced per square foot; European products are often priced per square meter. The calculator handles both.

How do I calculate flooring for a room with a closet?

Measure the closet as its own rectangle and add it to the main room area before applying your waste factor. Don't skip it — closets need flooring and continuity matters.

What waste factor should I use for herringbone flooring?

Use 20–25% for herringbone or any diagonal pattern. The angle cuts create significant off-cut waste that a straight-lay 10% factor can't cover.

Common mistakes to avoid

✕Measuring the room rectangle instead of the actual floor — closets and alcoves are easily missed. Measure the real floor area.
✕Using too small a waste factor for diagonal patterns — 10% works for straight lay only. Diagonal installs need 15–20% extra.
✕Ordering a second batch to top off — a second production run may be visibly different even from the same product line.
✕Not keeping spare planks — buy 5–10% extra from the same dye lot. A single damaged plank years later may be impossible to match.

Tile Calculator

Calculate tiles needed with grout gap and waste factor. Works for any tile size.

Paint Calculator

Calculate gallons of paint needed for any room, including doors and windows.

Board Feet Calculator

Calculate board feet and lumber cost from thickness, width, and length.

Not sure whether to DIY this project?

Read our project-by-project guide on when to hire a contractor vs. do it yourself.

Read the guide →

About this calculator

Calculate the total area of your floor in square feet or meters. Supports rectangular and L-shaped rooms. Includes a customizable waste percentage and optional cost estimator.

All results are estimates. Verify quantities with your local supplier and confirm measurements before purchasing materials. Requirements vary by region and project type.

← All Calculators

Runs entirely in your browser - no data is sent anywhere