# Square Footage Calculator: Rooms and Whole Homes

> Measure up to six rooms in feet or metres, get the total area, the price per square foot and the flooring or tile you need with waste included

Three rooms of 14 by 12, 12 by 10 and 10 by 9 feet add up to 378 square feet, or 35.12 square metres. Enter your own room sizes below, in feet or metres, and you'll get the total area and how much material to buy.

## How is the area worked out?

For each rectangular room the calculator multiplies length by width, then adds up to six rooms and shows the sum in square feet and square metres. Metres convert at 10.7639 square feet for each square metre. Here are the default rooms.

| Room | Size in feet | Area in sq ft |
| --- | --- | --- |
| Room 1 | 14 by 12 | 168 |
| Room 2 | 12 by 10 | 120 |
| Room 3 | 10 by 9 | 90 |
| Total |  | 378 |

## What does the price per square foot tell me?

The total is 378 square feet. Say a home with this floor area is listed at $650,000. That's $1,719.58 a square foot, a handy way to compare listings of different sizes. Now suppose you want new flooring at $4.50 a square foot, with 10% extra for cuts and waste.

You'd buy 415.8 square feet, and the material costs $1,871. Read the same default numbers as metres instead and the total becomes 378 square metres, or 4,068.8 square feet, with a material cost of $20,140. A tenfold gap from one setting. Choose the unit before you type anything.

## How do I measure a room that isn't a plain rectangle?

Split it. Take an L-shaped living area: a main part of 14 by 12 feet plus a nook of 6 by 5 feet. Enter them as two rows, 168 and 30 square feet, for 198 in all. If you'd squared it off at 14 by 17 you'd have got 238 square feet, which is 40 more than the room really has. At $4.50 a square foot, that mistake costs you an extra $180 of flooring before waste.

Measure wall to wall at the floor, write each length down as you go, and do it twice. A cheap tape and a few minutes beat a return trip to the store, and a few bucks of wasted material.

## Where do measuring mistakes creep in?

Write the numbers down before you enter them, since every error carries through to the price and the material cost. A tape that's off by a few inches on a 14 foot wall doesn't look like much, but with six rooms added together the total visibly drifts.

The most common slip is a mixed unit, one room in feet and the next in metres. Every room must use the setting at the top. Another is treating an L-shaped room as one rectangle, which overstates the area, as the example above shows.

The tool covers only what you type. It ignores closets, stairs, wall thickness and any rule about what counts as living area when a home is listed, and a seller, an appraiser and a builder may each measure differently. Use the total for planning, and ask for a formal measurement before you buy or sign a contract. Then set the area against nearby sales in the [home value calculator](https://tax-services.ca/calculators/real-estate/home-value-calculator).

## Where this information comes from

The only constant is the conversion of 10.7639 square feet per square metre. Everything else comes from the sizes, price and cost you enter. The 10% waste is just a default, so change it to suit your material and layout, and ask the supplier what they advise. Nothing here comes from a government body or a real estate board, and we have no connection with either.

Once you know the area, price the project against your monthly plan with the [budget calculator](https://tax-services.ca/calculators/savings-budget/budget-calculator). And if the space belongs to a place you plan to buy, the [down payment calculator](https://tax-services.ca/calculators/mortgage/down-payment) works out the cash you need.

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Source: https://tax-services.ca/calculators/real-estate/square-footage-calculator
Last updated: 2026-10-10
Independent information site. Not affiliated with the CRA. No services, no guarantee of accuracy. See https://tax-services.ca/disclaimer