Area Calculator

Calculate the area of common geometric shapes quickly and accurately. Enter the required measurements and choose your preferred unit.

▼ Enter the measurements and click Calculate

Rectangle

Length (l)

Width (w)

Area —

Triangle

Side 1 (a)

Side 2 (b)

Side 3 (c)

Area —

Trapezoid

Base 1 (b₁)

Base 2 (b₂)

Height (h)

Area —

Circle

Radius (r)

Area —

Sector

Radius (r)

Angle (θ)

Area —

Ellipse

Semi-major Axis (a)

Semi-minor Axis (b)

Area —

Parallelogram

Base (b)

Height (h)

Area —

What Is Area?

Area is the amount of space covered by a two-dimensional shape or surface. It is commonly measured in square units, such as square meters, square feet, square centimeters, acres, and hectares.

Area Formulas

Rectangle: Area = Length × Width

Triangle: Area = √[s(s − a)(s − b)(s − c)]

Trapezoid: Area = ½ × (Base₁ + Base₂) × Height

Circle: Area = π × r²

Sector: Area = (θ / 360) × π × r²

Ellipse: Area = π × a × b

Parallelogram: Area = Base × Height

Common Area Units

Unit	Equivalent in Square Meters
Square meter (m²)	1
Square centimeter (cm²)	0.0001
Square foot (ft²)	0.092903
Square yard (yd²)	0.836127
Acre	4,046.856
Hectare	10,000
Square kilometer (km²)	1,000,000

Frequently Asked Questions

How do I calculate the area of a rectangle?

Multiply the length by the width. The result is the area in square units.

What is the area formula for a circle?

The area of a circle is calculated using π × r², where r is the radius.

What units can I use?

You can enter measurements in meters, centimeters, feet, inches, or yards. The calculator converts the measurements before calculating the area.

Disclaimer

This calculator is provided for general mathematical and educational purposes. While we aim to provide accurate results, SmartMyTools does not guarantee that the results are suitable for professional engineering, construction, surveying, or other specialized applications.