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Square Footage Calculator

Calculate the square footage of rectangular areas. Enter width, length, and quantity for multi-room projects — results update instantly with unit conversion.

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How Square Footage Works

Square footage measures the area of a flat surface. For a rectangle, the formula is simple:

Area = Width × Length

If you’re calculating flooring for multiple rooms of the same size, multiply by the number of rooms:

Total Area = Width × Length × Quantity

How to Use the Calculator

  1. Select your unit — feet, meters, inches, or another option from the dropdown.
  2. Enter the width — one side of the rectangular area.
  3. Enter the length — the adjacent side.
  4. Set the quantity — defaults to 1; increase if you have multiple rectangles of the same size.

The total area and per-rectangle area appear immediately as you type.

Practical Examples

ProjectWidthLengthQuantityTotal Area
Living room floor15 ft20 ft1300 ft²
Bedroom flooring × 312 ft14 ft3504 ft²
Kitchen backsplash10 ft2 ft120 ft²
Patio pavers5 m4 m120 m²
Office carpet tiles18 in18 in49 ft²

Unit Conversion

The calculator converts dimensions automatically when you switch units. Common conversions:

  • 1 ft = 12 in = 0.3048 m
  • 1 m ≈ 3.28084 ft
  • 1 yd = 3 ft
  • 1 cm = 0.0328084 ft

Area units scale by the square of the conversion factor. For example, 1 m² ≈ 10.764 ft².

Sources

Frequently Asked Questions

How do I calculate square footage?

Multiply width by length: Area = w × l. For multiple rooms of the same size, multiply by the quantity. The calculator does this automatically — just enter your dimensions and the result appears instantly.

What units can I use?

The calculator supports feet (ft), meters (m), inches (in), yards (yd), centimeters (cm), and millimeters (mm). The area is shown in the corresponding square unit (ft², m², etc.). Changing the unit converts all entered values automatically.

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

Break the room into smaller rectangles, calculate each one separately, and add the results. For L-shaped rooms, treat each leg as its own rectangle. For triangular or curved areas, you'll need different formulas.

What is the difference between square footage and square meters?

Square footage uses imperial units (feet), while square meters are metric. 1 square meter ≈ 10.764 square feet. The calculator handles both — just select your preferred unit from the dropdown.