How to Use the Square Footage Calculator
Calculating square footage is a fundamental skill for home improvement, real estate, and gardening projects. Whether you're ordering new hardwood flooring, measuring a room for paint, or planning a landscape design, our tool provides instant, accurate results for three common shapes.
- 1
Choose Your Shape: Select from Rectangle (for most rooms), Circle (for round patios or fire pits), or Triangle.
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Input Dimensions: Enter your measurements in feet. The calculator updates automatically as you type.
- 3
Get Results: View your total area in both square feet (US standard) and square meters (metric standard).
Manual Calculation Formulas
If you prefer to calculate by hand, use these standard geometric formulas:
Length × Width π × Radius² 0.5 × Base × Height Common Square Footage FAQ
How do I measure an L-shaped room?
The easiest way is to divide the room into two smaller rectangles. Calculate the square footage for each rectangle separately and then add the two results together.
Should I buy extra material for waste?
Yes. For flooring or tile projects, it is standard practice to purchase 10% more material than your actual square footage to account for cuts, breakage, and waste.
How do I convert square feet to square yards?
To convert square feet to square yards, divide your total square footage by 9. This is particularly useful for carpet and some landscaping materials.