Square Footage Calculator — Room and Floor Area
Type length and width. Get square feet, square yards, square meters, and an optional cost line.
- Square feet
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- Square inches
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- Square yards
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- Square meters
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- Square cm
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What is square footage calculator?
Square footage is the universal unit of measure for rooms, floors, yards, and rectangular surfaces in the US. The formula is simple — length × width, with both measurements in feet — but in practice you might measure in inches, meters, yards, or centimeters, and you might want the answer in any of those squared units. This calculator does the unit math: type length and width in whichever unit you have, and read the area in five different units at once.
The optional cost overlay handles the most common follow-up question — “what will this floor cost?” Toggle the checkbox, type the price per square foot from your flooring vendor, and the total cost line appears below the area. The cost is materials-only; budget an extra 5–10 % for waste cuts and add any installation, underlayment, or delivery fees the vendor quotes separately.
Privacy is straightforward: the calculation runs entirely in your browser. The values you type never leave your device. The only saved state is your unit preference and the cost-toggle state, both in localStorage so the tool remembers your last setup next visit.
When to use a square footage calculator
- Buying flooring or tile — total area + cost — Most flooring is priced by the square foot. Type the room's length and width, switch the unit to ft if you measured in feet, and read the area. Toggle the cost overlay, type the $/sqft from the product page, and the total cost line appears underneath.
- Measuring a yard or driveway in mixed units — You measured in feet and your contractor quoted in square yards. Type the feet, read all five outputs at once: sqft, sqin, sqyd, sqm, sqcm. The unit you typed determines the conversion baseline.
- Cross-checking a listing — A real-estate listing claims 'over 250 sqft' for a room. Measure the room (in feet, inches, meters, whatever), type the dimensions, and confirm — or call out the listing.
How to use the Square Footage Calculator — Room and Floor Area
- Pick the unit you measured in — Choose ft, in, yd, m, or cm in the segmented control. The choice determines how the calculator interprets your length and width — switching it does not convert numbers you already typed.
- Type length and width — Both values must be positive. Decimals are fine (e.g., 10.5). The area appears as soon as both fields are filled.
- Read the area in all five units — The headline shows square feet. The stats list shows sqft, sqin, sqyd, sqm, sqcm — useful when you're moving between systems.
- (Optional) Include cost per square foot — Tick the 'Include cost' checkbox to reveal a $/sqft input. Type the rate from your product page, and the total cost line appears under the area. The cost toggle state and unit preference both persist across visits.
Worked examples
10 ft × 12 ft (small bedroom)
Input: Length 10 ft, Width 12 ft
Output: Area = 120 sqft (= 17280 sqin, 13.3333 sqyd, 11.1484 sqm)36 in × 48 in (small rug)
Input: Length 36 in, Width 48 in, Unit in
Output: Area = 12 sqft (= 1728 sqin, 1.3333 sqyd)1728 sqin = 12 sqft — the in-to-ft conversion is 144 sqin per sqft.
3 m × 4 m with cost @ $5.50/sqft
Input: Length 3 m, Width 4 m, cost toggle on, rate 5.50
Output: Area ≈ 129.1669 sqft. Total cost ≈ $710.4212 sqm ≈ 129.1669 sqft — the conversion is 10.7639 sqft/sqm.
Frequently asked questions
How do I calculate square footage?
10 ft × 12 ft = 120 sqft. If you measured in inches, divide the result by 144 (because 12 in × 12 in = 144 sqin per sqft). The calculator handles the unit math for you so you only type the raw measurements.How many square feet are in a square yard?
How many square feet are in a square meter?
1 / 0.09290304). Going the other way, multiply sqft by 0.09290304 to get sqm.Does this calculator only work for rectangular rooms?
length × width for a single rectangle. For an L-shaped room, divide it into two rectangles, compute each, and sum the sqft. For circular areas, use our circle area calculator. For triangles, use the triangle calculator.What if my measurements are in feet and inches together?
10' 6" = 10 + 6/12 = 10.5 ft. Then type 10.5 in the length field with the unit set to ft.How accurate is the cost estimate?
Are my numbers stored or sent anywhere?
localStorage.