Square Footage CalculatorFree online other calculator — instant results, no sign-up
Area in square feet and meters.
About the Square Footage Calculator
The Square Footage Calculator determines the surface area of a rectangular space in both square feet and square meters, along with estimated project material or installation costs. It is commonly used by homeowners, contractors, flooring installers, and painters to estimate coverage and budget for renovations.
- Length
- The length of the rectangular area in feet, typically entered as a positive number.
- Width
- The width of the rectangular area in feet, typically entered as a positive number.
- Price per sq ft (optional)
- The unit cost per square foot in dollars, such as flooring or paint material cost; defaults to 0.
Formula and method
Area (ft²) = Length × Width Area (m²) = Area (ft²) × 0.092903 Total Cost = Area (ft²) × Price per sq ft
- LengthDimension of the room or surface along its length (feet)
- WidthDimension of the room or surface along its width (feet)
- Area (ft²)Calculated surface area in square feet
- Area (m²)Surface area converted to square meters using 0.092903 m² per sq ft
- Price per sq ftCost per square foot in dollars
- Total CostEstimated total cost in dollars
The tool multiplies length by width to compute the area in square feet, rounded to two decimal places. It then converts that area to square meters by multiplying by 0.092903. Finally, it multiplies the square footage by the optional unit price to yield the estimated total cost.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Length12 ft
- Width15 ft
- Price per sq ft (optional)0 $
Results
- Area180 ft²
- In m²16.72
- Cost$0.00
How to use the Square Footage Calculator
- 1Enter the length and width of the space in feet.
- 2Optionally enter the price per square foot in dollars.
- 3Multiply length by width to calculate the total square footage.
- 4Review the resulting area in square feet, equivalent square meters, and total estimated cost.
Reading your result
The primary result shows the total surface area in square feet (ft²) alongside its metric equivalent in square meters (m²). If a unit price is provided, the cost output reflects the baseline expenditure for materials or labor covering that exact area.
Limitations
The calculation assumes a single flat, rectangular plane and does not account for irregular shapes, alcoves, or cutouts. It also does not factor in waste allowances (typically 10% to 15% for tiles or hardwood), labor surcharges, or minimum order minimums.
Common questions
How do I measure an L-shaped room?+
Divide the room into two separate rectangular sections, calculate the square footage of each section independently, and add the two totals together.
How much extra material should I buy beyond the calculated square footage?+
For flooring, tile, and drywall projects, it is standard practice to purchase an extra 10% to 15% to account for cutting waste, pattern matching, and future repairs.
How do I convert inches to feet before entering the dimensions?+
Divide the number of inches by 12. For example, a measurement of 10 feet 6 inches equals 10 + (6 / 12), which is 10.5 feet.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
Further reading
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Results are estimates for informational purposes and are not financial, medical or legal advice.