Square Footage Calculator

Shape

Length

Width

Frequently Asked Questions

For a rectangle: length × width. For a triangle: (base × height) ÷ 2. For a circle: π × radius². Make sure all measurements are in feet before calculating.

A 10×10 room is 100 square feet. Multiply length by width: 10 × 10 = 100 sq ft.

Break the room into rectangles. Calculate each rectangle's area separately and add them together. You can also subtract areas for alcoves or columns.

1 square yard = 9 square feet. Divide your square footage by 9 to get square yards.

Calculate the square footage of the room, then add 10% for waste and cuts. For example, a 200 sq ft room needs about 220 sq ft of flooring material.

About the Sq Ft Calculator

This free sq ft calculator helps you get accurate results instantly without needing to work through the math manually. Whether you need a quick estimate or a precise figure, having a reliable tool on hand saves time and reduces errors compared to manual calculation.

How to Use This Calculator

Enter your values in the input fields above. Each field is labeled to guide you.
Double-check your inputs — results are only as accurate as the numbers you enter.
Click the Calculate button to see your result instantly.
Use the result for your planning, budgeting, or decision-making.

Why Accurate Calculations Matter

Small errors in math calculations can compound into significant problems. A 1% miscalculation in a budget or measurement can translate to hundreds or thousands of dollars in wasted resources, or result in having to redo work entirely. This calculator uses the standard formulas and methods to give you reliable results you can trust.

Tips for Getting the Best Results

Use consistent units throughout (all in feet, all in dollars, etc.)
For estimates, add a 10% buffer to account for real-world variables
Save your result by taking a screenshot or writing it down before closing the page
For decisions involving significant money or safety, verify results with a qualified professional

Frequently Asked Questions

Is this calculator free? Yes — completely free with no account, login, or payment required. Use it as many times as you need.

How accurate are the results? This calculator uses the standard formulas for sq ft calculations. Results are accurate for typical use cases. For specialized or high-stakes applications, consult a professional.

Does it work on mobile? Yes. This calculator is fully responsive and works on smartphones, tablets, and desktops.