Square Footage Calculator โ Measure Area in Square Feet Instantly
Free square footage calculator for rooms; properties; and flooring. Calculate area from length and width in feet; inches; or meters.
Calculating square footage is essential for home improvement projects; real estate listings; and material purchases. Whether you are measuring a room for new flooring; estimating paint coverage; or determining property size; accurate square footage calculations save time and money. This calculator handles rectangular; circular; and irregular shapes with unit conversions built in.
How do I calculate square footage?
For rectangular spaces; multiply length by width in feet. For example; a 15 x 20 foot room is 300 square feet. For irregular shapes; divide the area into rectangles; calculate each separately; then add them together. For circular areas; use the formula pi x radius squared.
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How to Use This Calculator
Enter your values in the fields above and the calculator will compute results instantly as you type. You can adjust any input to compare different scenarios. All calculations happen in your browser โ no data is sent to any server and nothing is stored. Use the share buttons below the results to save or send your calculations via WhatsApp, Twitter, or by copying the link. For related calculations, check the suggested tools in the "What to calculate next" section below.
Key Information
| Parameter | Details |
|---|---|
| Standard Room Size | 12 x 12 ft = 144 sq ft |
| Conversion Factor | 1 sq meter = 10.764 sq ft |
| Flooring Waste Factor | Add 10% for waste and cuts |
| Paint Coverage | 1 gallon covers ~350-400 sq ft |
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Use Calculator NowFrequently Asked Questions
How do I calculate square footage?
For rectangular spaces; multiply length by width in feet. For example; a 15 x 20 foot room is 300 square feet. For irregular shapes; divide the area into rectangles; calculate each separately; then add them together. For circular areas; use the formula pi x radius squared.
How many square feet is a typical house?
The median US home size is approximately 2;300 square feet. A small apartment ranges from 400-800 sq ft; a starter home is 1;000-1;500 sq ft; and a large family home is 2;500-4;000 sq ft. Square footage typically includes all heated living space but excludes garages; porches; and unfinished basements.
How do I convert square feet to square meters?
Divide square feet by 10.764 to get square meters. For example; 500 sq ft / 10.764 = 46.45 sq meters. To convert the other direction; multiply square meters by 10.764. This conversion is important when dealing with international property listings or building specifications.
Are these calculators free to use?
Yes, all calculators on CalcCorp are completely free โ no registration, no login, no hidden charges. Results are calculated instantly in your browser and we do not store any of your data.
How accurate are these calculations?
Our calculators use standard financial formulas updated with the latest tax rates, interest rates, and government policies for 2026. Results are accurate for planning purposes but should be verified with a professional for final decisions.
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Last updated: March 2026