Area Calculator

What Is an Area Calculator?

An area calculator is a tool that computes the total surface of a two-dimensional space by multiplying its length by its width. It is used for measuring rooms, properties, land plots, construction sites, gardens, and any rectangular or square space. Area is expressed in square units such as square feet, square meters, square yards, acres, or hectares depending on the scale and region.

This calculator handles two tasks: calculating area from length and width dimensions, and converting existing area measurements between different units. Whether you need to know how many square meters are in 850 square feet, or you need to find the area of a 20 by 15 foot room, this tool gives you instant results and conversions across all common area units. For 3D shapes such as boxes, cylinders, spheres, and pyramids, use the dedicated surface area calculator.

How to Calculate Area

Rectangle and Square Area

The most common area calculation is for rectangular and square spaces. The formula is:

For a room that is 20 feet long and 15 feet wide, the area is 20 × 15 = 300 square feet. For a square room where length and width are equal, such as 12 × 12 feet, the area is 144 square feet. The same formula applies in any unit: meters, yards, or any other linear measurement.

Circle Area

For circular spaces such as round rooms, pools, or plots of land, the formula uses the radius:

A circular room with a radius of 10 feet has an area of 3.14159 × 100 = 314.16 square feet. For a dedicated tool that calculates radius, diameter, circumference, and area from any one value, use our circle calculator.

Triangle Area

Triangular spaces such as pitched roof sections or irregular land plots use the following formula:

A triangular garden with a base of 30 feet and a height of 20 feet has an area of (30 × 20) ÷ 2 = 300 square feet. The height must be perpendicular to the base for an accurate result.

Area Unit Conversions

For a broader reference covering length, weight, volume, and temperature alongside area, see the full unit conversion chart.

Square Feet to Square Meters

Square feet and square meters are the two most commonly used area units worldwide. The United States uses square feet, while most other countries use square meters. To convert square feet to square meters, divide by 10.764:

For example, 360 sq ft ÷ 10.764 = 33.45 sq m. And 850 sq ft ÷ 10.764 = 78.97 sq m.

Square Meters to Square Feet

To convert square meters to square feet, multiply by 10.764:

For example, 1 sq m = 10.764 sq ft. A 50 sq m apartment equals 538.2 sq ft, which is a compact but functional studio apartment by US standards.

Acres to Square Feet

Acres are used primarily for land measurement in the United States, United Kingdom, and several other countries. One acre equals exactly 43,560 square feet:

A half-acre lot is 21,780 sq ft. A quarter-acre lot, common in suburban neighborhoods, is 10,890 sq ft. Use the convert mode in the calculator to convert any acreage value to square feet, square meters, or hectares.

Common Area Conversions Table

What Is 1 Square Meter?

One square meter is a square with sides measuring exactly 1 meter (3.281 feet) on each side. It equals 10.764 square feet, which is approximately the size of a small bathroom floor tile section or a large exercise mat. Visualizing 1 square meter helps when reading property listings in countries that use the metric system.

In practical terms, a standard queen-size bed occupies roughly 3.6 square meters (about 38 sq ft). A standard parking space is approximately 15 square meters (about 161 sq ft). A studio apartment in a major city might be 25 to 35 square meters (270 to 376 sq ft). When comparing properties across US and European listings, use the Convert Area tab above to switch between sq ft and sq m instantly.

Common Room Sizes in Square Feet

Understanding typical room sizes helps you interpret floor plans, estimate flooring materials, and compare properties. Use the meeting room size calculator for more detailed commercial space planning.

Bedroom Sizes

A small bedroom is typically 70 to 100 sq ft (6.5 to 9.3 sq m), large enough for a twin bed and minimal furniture. A standard bedroom ranges from 100 to 150 sq ft (9.3 to 13.9 sq m) and comfortably fits a queen bed, dresser, and desk. A large master bedroom is 200 to 300 sq ft (18.6 to 27.9 sq m) and can include a king bed, sitting area, and walk-in closet access.

Living Room Sizes

A small living room is typically 130 to 170 sq ft (12 to 15.8 sq m), suitable for a sofa and coffee table. A standard living room is 200 to 300 sq ft (18.6 to 27.9 sq m), which comfortably fits a full sofa arrangement, TV area, and walkways. A large open-plan living and dining area can be 400 to 600 sq ft (37.2 to 55.7 sq m) or more in higher-end homes.

Office Spaces

A private office for one person typically requires 100 to 150 sq ft (9.3 to 13.9 sq m). A small team workspace for 4 to 6 people ranges from 400 to 700 sq ft (37.2 to 65 sq m). A conference room for 8 to 10 people typically needs 250 to 400 sq ft (23.2 to 37.2 sq m). Open-plan offices allocate approximately 75 to 100 sq ft per person in modern coworking environments. For detailed meeting room planning, visit the meeting room size calculator.

Frequently Asked Questions