How do you calculate area?

Area is calculated with a formula specific to the shape: length times width for a rectangle, pi times radius squared for a circle, half of base times height for a triangle, and so on. This page's calculator applies the right formula automatically once you pick a shape.

What is the formula for the area of a circle?

The area of a circle is pi multiplied by the radius squared, written A = πr². A circle with a 5 m radius has an area of about 78.54 m².

What is the formula for the area of a triangle?

With a known base and height, area equals half of base times height, A = ½bh. With only three side lengths, Heron's formula is used instead: A = √[s(s−a)(s−b)(s−c)], where s is half the perimeter.

How many square feet are in an acre?

One acre equals 43,560 square feet.

How many square meters are in a hectare?

One hectare equals exactly 10,000 square meters, or a 100 m by 100 m square.

How do I convert square meters to square feet?

Multiply the square meter value by about 10.7639. For example, 50 square meters equals roughly 538.2 square feet.

How do I convert acres to hectares?

Multiply the acre value by about 0.404686. For example, 10 acres equals about 4.05 hectares.

What is the difference between an acre and a hectare?

A hectare (10,000 m²) is larger than an acre (about 4,047 m²) by roughly 2.47 times. Acres are common in the US and UK; hectares are the metric standard used almost everywhere else.

How do I find the area of an irregular shape?

Split the irregular shape into regular shapes such as rectangles and triangles, calculate each area separately, then add them together.

What is the area of a trapezoid?

The area of a trapezoid is half the sum of its two parallel sides multiplied by its height, A = ½(a+b)h.

How do you find the area of a regular polygon?

For a regular polygon with n sides of length s, area equals (n × s²) divided by (4 × tan(π/n)).

What units should I use for area?

Use square meters or square feet for rooms and buildings, acres or hectares for land and farms, and square kilometers or square miles for large regions.

Does this calculator work for land measurement?

Yes. Enter the plot's dimensions in the shape calculator, then switch the result to acres or hectares in the converter tab.

Is this area calculator free to use?

Yes, it is completely free, requires no registration, and runs entirely in your browser with no usage limits.

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Area Conversion

9 shapes · 11 area units

Area Calculator & Converter

Work out the area of a room, plot, or shape from its dimensions, then convert the result into square meters, square feet, acres, hectares and eight other units — all calculated instantly in your browser.

9Shape formulas

11Area units

0msServer round-trips

Measurement unit

24m²

A = l × w = 6 × 4 = 24 m²

From

m²

To

ft²

10.76391042ft²

ft² = m² × 10.76391042

Runs locally, no data sent Standard NIST/BIPM factors Free, no sign-up

Area formulas for every shape

The exact formula behind each calculation above, with a short note on when you'd use it.

Quick conversion table

Common values for your selected units in the converter above, updated automatically.

Square Meter	Square Foot

Area unit reference

What each unit means, where it's defined, and what it's typically used to measure.

More converters from ConvertGPT

Working across other units too? These are the ones people pair with area most often.

Frequently asked questions

Straight answers to the questions people ask most about calculating and converting area.

All calculations and conversions run locally in your browser using standard NIST/BIPM conversion factors. No data is sent anywhere.

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