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.
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. Break it into two rectangles and give each its own row.
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.
Where the numbers come 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. And if the space belongs to a place you plan to buy, the down payment calculator works out the cash you need.
Frequently asked questions
How do I find a room's area in square feet?
Multiply length by width in feet. A room of 14 by 12 feet is 168 square feet.
How many square feet fit in a square metre?
One square metre is 10.7639 square feet, and the calculator does the conversion when you choose metres.
How do I measure an L-shaped room?
Cut it into two rectangles, work out each area and enter both as separate rooms.
How much extra flooring should I order?
The default is 10% for cuts and waste, so the 378 square feet of the default rooms become 415.8 square feet to order.
What is the price per square foot?
The home's price divided by its area. At $650,000 and 378 square feet, that's $1,719.58.
Sources and updates
Updated: . How we check rates · Editorial team · Updates
Estimate only. These figures are a planning estimate, not tax, legal or accounting advice. Tax-Services.ca is an independent publisher: we don't prepare or file tax returns, and we don't offer tax, legal or accounting services. We have no connection with the Canada Revenue Agency, Revenu Québec or any provincial government. Your real amounts depend on details this tool cannot see, so confirm them with an official source or a qualified professional before you act.