Square Footage Calculator

To measure a standard rectangular room using this easy-to-use online tool, select Rectangle / Square as the area shape. Choose your input unit (e.g., feet), then enter the room Length and Width. This intuitive interface allows you to determine the precise surface size quickly. Leave Quantity as 1 if you’re only calculating one room. Click Calculate Area, and the calculator will display the total square footage.

Yes. This handy feature makes it efficient to compute totals for larger properties. If you have several identical spaces (for example, 3 bedrooms with the same dimensions), enter the Length and Width for one room, then set Quantity to the number of identical rooms. The calculator multiplies the single area by the quantity to simplify the process and shows your total square footage.

For a renovation project like flooring, choose Rectangle / Square and enter the floor’s Length and Width. If your room layout includes extra areas like closets or alcoves, treat each one as a separate rectangle, calculate their areas, and add them together. To ensure a precise result and avoid running short on materials, use the Cost & Waste option and set Waste Percentage to at least 10%, or 15% for diagonal or complex tile patterns.

First, add the lengths of all the walls you plan to paint to find the total perimeter of the room. Enter this perimeter as Length and the ceiling height as Width in Rectangle mode. Subtract about 20 sq ft for each door and 15 sq ft for each window to determine the exact paintable surface for your home. As a general rule, 1 gallon of paint covers about 350–400 sq ft, so divide your final wall area by that coverage to estimate how many gallons you need.

Most yards aren’t perfect rectangles. To design your landscape accurately, break the space into smaller basic shapes such as rectangles, triangles, circles, or borders. Use the Shape dropdown to visualize and calculate each section separately:

• Rectangles for straight sections of lawn.
• Triangles for angled corners.
• Circles for round flower beds or tree bases.
• Rectangle Border for paths around a house or pool.

Add all individual areas together to get the total landscaping square footage.

These modes are specific applications for different shapes:

• Rectangle Border calculates the area of a rectangular frame, such as a path around a rectangular pool or patio. It uses the formula Total Area - Inner Area.
• Ring (Annulus) is a customizable option for circular borders, like a circular path around a tree or fountain. It uses Area = π(R² - r²), where R is the outer radius and r is the inner radius.

You can choose the input unit that matches your measurement, such as feet, meters, or yards. The calculator performs a reliable conversion using standard rates, for example:

• 1 square foot = 144 square inches
• 1 square yard = 9 square feet
• 1 square meter ≈ 10.764 square feet
• 1 acre = 43,560 square feet
• 1 hectare ≈ 2.471 acres (~107,639 sq ft)

This helps you easily switch between units for different projects or supplier requirements.

The calculator applies well-known geometry formulas to compute accurate results, such as:

• Rectangle / Square: Area = L × W
• Circle: Area = π × r²
• Triangle: Area = ½ × B × H
• Trapezoid: Area = ½(a + b) × h
• Parallelogram: Area = b × h
• Ellipse: Area = π × a × b
• Rhombus: Area = ½ × d&sub1; × d&sub2;
• Border: Total Area - Inner Area
• Ring (Annulus): Area = π(R² - r²)

These formulas ensure accuracy whether you’re working with simple or more complex shapes.

If you want to estimate project cost, enable “Add Cost & Waste Calculation (Optional)”. Then:

1. Find the base area.
2. Add the selected waste percentage.
3. Multiply by the cost per unit.
4. View the adjusted square footage and the estimated total cost.

This gives you a detailed and realistic view of how much material and budget you’ll need to plan effectively.

Yes, this user-friendly square footage calculator is suitable for both DIY homeowners and professionals (contractors, painters, landscapers). Whether you are working from a blueprint or measuring on-site, its interactive features support multiple shapes, unit conversions, and cost/waste estimates to help you:

• Prepare accurate material lists.
• Avoid under-ordering or over-ordering.
• Create clear, data-based quotes for clients.