Flooring Area Calculator - Instant Square Footage Results

Flooring Area Calculator

A flooring area calculator finds how much floor space a room covers, in square feet or square meters, by multiplying the room's length by its width. The result tells a person how much tile, wood, carpet, laminate, or vinyl to buy for a project.

How to calculate flooring area

Flooring area calculation uses the formula for the area of a rectangle: multiply length by width.

$\text{Area} = \text{Length} \times \text{Width}$

This works because a rectangle can be divided into equal rows of unit squares. The number of rows equals the width, and the number of squares in each row equals the length, so the total count of squares equals length times width.

Example in feet

A living room measures 12 feet long and 10 feet wide.

$12 \text{ ft} \times 10 \text{ ft} = 120 \text{ square feet (sq ft)}$

Example in meters

A room measures 4 meters long and 3 meters wide.

$4 \text{ m} \times 3 \text{ m} = 12 \text{ square meters (sq m)}$

The formula assumes a perfectly rectangular room. Real rooms sometimes have walls that are not quite square. For most home projects this small difference does not matter, because installers add extra material anyway (see the waste factor section below).

Units of measurement

Flooring area is usually given in one of two units:

• Square feet (sq ft) — the standard unit in the United States and parts of Canada.
• Square meters (sq m) — the standard unit in most other countries.

Retailers in the US price flooring by the square foot. Retailers in most other countries price it by the square meter. To compare prices between the two, use these conversion factors:

• 1 square meter = 10.764 square feet
• 1 square foot = 0.0929 square meters

For example, tile priced at 45 per square meter costs about 4.18 per square foot (45 ÷ 10.764 ≈ 4.18).

How to use the flooring area calculator

1. Enter the room's length.
2. Enter the room's width.
3. Choose feet or meters from the unit menu.
4. The area appears immediately and updates as the numbers change; there is no separate button to press.
5. Use the copy button to copy the result.

A diagram next to the result shows the room's shape in proportion to its length and width. This makes it easier to notice a mistyped number, such as entering 120 feet instead of 12 feet.

Measuring a room accurately

• Use a metal tape measure. Cloth tapes stretch over time and give a slightly wrong reading.
• Measure to the nearest 1/8 inch or nearest millimeter. That level of care is enough for most flooring jobs.
• Measure the length at both ends of the room and in the middle, since walls are not always perfectly parallel. Use the largest of the three numbers.
• Measure wall to wall, not baseboard to baseboard. Flooring needs to run under the baseboards.
• For a room that is not a simple rectangle, split it into two or more rectangles and add their areas together.

Adding a waste factor

The calculated area is the minimum amount of material needed. Installers order more than that, because some material is cut away and wasted. How much extra depends on the installation pattern:

For example, a 200 sq ft room installed in a straight pattern with 10% waste needs about 220 sq ft of material.

Calculating an L-shaped room

Most calculators, including this one, multiply one length by one width, so they only work directly on a rectangle. A room shaped like the letter L can be measured by splitting it into two rectangles and adding the results.

Example: An L-shaped living and dining room has a living area of 15 ft × 12 ft (180 sq ft) and a dining area of 10 ft × 8 ft (80 sq ft).

$180 \text{ sq ft} + 80 \text{ sq ft} = 260 \text{ sq ft}$

The same method works for a bay window, an alcove, or any other space made of rectangular sections: measure each rectangle, calculate its area, and add the areas together.

Subtracting fixed features

Whether to subtract a fixture from the total depends on whether it is permanent.

Usually subtracted: kitchen islands bolted to the subfloor, built-in bathtubs and shower bases, structural columns, and floor-to-ceiling built-in cabinets.

Usually not subtracted: refrigerators, stoves, and other appliances that can be moved; freestanding furniture; and toilets, since installers commonly run flooring underneath them so the next toilet can be swapped in easily.

Example: A kitchen measures 15 ft × 12 ft (180 sq ft) and has a built-in island measuring 4 ft × 3 ft (12 sq ft).

$180 \text{ sq ft} - 12 \text{ sq ft} = 168 \text{ sq ft}$

Material quantities by flooring type

Square footage is the starting point for an order, but different materials are sold in different units.

• Hardwood comes in boxes that typically cover 20–25 sq ft each.
• Tile is sold by the piece or by the box, and usually needs more waste allowance than other materials because cut pieces are often unusable elsewhere.
• Carpet is sold from rolls that are usually 12 or 15 feet wide, so the room's dimension across the roll affects how much is needed.
• Laminate and vinyl plank boxes typically cover 20–35 sq ft each.
• Subflooring sheets are commonly 4 ft × 8 ft (32 sq ft) each and are ordered to cover the area edge to edge, without a waste factor.

Frequently asked questions

How do I calculate flooring area for an L-shaped room?

Split the room into two or more rectangles, calculate the area of each one, and add them together. For example, a 10 ft × 12 ft section (120 sq ft) plus an 8 ft × 6 ft section (48 sq ft) totals 168 sq ft.

How do I convert square feet to square meters?

Multiply the square footage by 0.0929. A 200 sq ft room equals about 18.6 square meters. To convert the other way, multiply square meters by 10.764.

How much extra flooring should I buy for waste?

Between 5% and 20% extra, depending on the installation pattern. Straight installations typically need 5–10% extra, diagonal installations about 15%, and herringbone or chevron patterns 15–20%.

Should I include closets when measuring for flooring?

Include a closet if the same flooring will be installed there. Measure it as its own rectangle and add its area to the room's total.

Do baseboards need to be subtracted from the measurement?

No. Measure from wall surface to wall surface. Flooring extends under where the baseboards will sit, so the small gap covered by a baseboard is not subtracted.

Can this calculator be used for subflooring?

Yes. Subflooring covers the same area as the finished floor. It is usually ordered in 4 ft × 8 ft (32 sq ft) sheets, rounded up to the nearest whole sheet.