Square Footage Calculator
Calculate area in square feet from length and width — useful for flooring, paint, and materials.
Fill in the required fields to see your result.
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This is the total area of the rectangular space you entered.
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How Square Footage Is Calculated
Square footage for a rectangular space is simply length multiplied by width, both measured in feet.
How to Calculate Square Footage
Area = Length × Width.
Square Footage Calculator Formula
- Area (sq ft) = Length (ft) × Width (ft)
Does This Work for Non-Rectangular Rooms?
Not directly — for L-shaped or irregular rooms, split the space into rectangular sections, calculate each separately, and add the results together. This calculator supports rectangular areas only.
Square Footage Examples
A 14 ft × 18 ft room: 14 × 18 = 252 square feet.
Common Square Footage Calculation Mistakes
Measuring in inches without converting to feet first, which inflates the result by a factor of 144. Treating an L-shaped or irregular room as a single rectangle instead of splitting it into sections. Confusing square footage (area) with linear footage (a length measurement) when reading material quotes that specify one or the other.
How to Use This Calculator
Enter the length and width of a rectangular space in feet.
Formula & Methodology
Area = Length × Width. This supports rectangular spaces only.
Example: a 12 ft × 15 ft room
12 × 15 = 180 square feet.
Supports rectangular areas only — for L-shaped, circular, or other irregular spaces, split the area into rectangles and add the results together, or use a shape-specific calculator.
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Frequently Asked Questions
- How is square footage calculated?
- Length multiplied by width, both measured in feet, giving the area in square feet.
- Does this work for non-rectangular rooms?
- Not directly — for L-shaped or irregular rooms, split the space into rectangular sections, calculate each separately, and add the results together.
- What is this useful for?
- Estimating material needs for flooring, paint, tile, or carpet, or for general room-size reference.
Last updated 7/17/2026