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Area of a Sector Calculator


Introduction to Area of a Sector

Area of a sector is the number of square in order to fill a sector of a circle. The area of sector is proportional to the central angle.

Area of a sector calculator

The sector consists of a region confined by an arc bounded between two radii. If its central angle is bigger, the area of the sector will also be larger accordingly.

Area of Sector formula in Central Angle

Area of sector is used to measure the central angle (θ) in degrees. As, the area of a circle=r2 and the angle of a full circle = 360°

Thus, the formula of the area of a sector of a circle is:

$$\frac{\text{Area of Sector}}{\text{Area of Circle}}\;=\;\frac{Central\;Angle}{360°}$$


$$\text{Area of Sector}\;=\;\frac{0}{360°} * πr^2 $$

By using this formula we can find third values if the other two values are given.

Area of Sector formula in Radian

To measure the angle of a circle in radians, the area of a sector of a circle is



$$\text{Area of Sector}\;=\;\frac{θ}{2π} * πr^2 $$

$$\text{Area of Sector}\;=\;\frac{1}{2} * θr^2 $$

Semicircle Area formula

To know the area of the half of a circle, this formula will be applicable.

$$\text{Semicircle area}\;=\;\frac{πr^2}{2} $$

Divide the area of the circle by 2.

Quadrant Area formula

To know the area of a quarter of a circle, this formula will be applied.

$$\text{Quadrant area}\;=\;\frac{πr^2}{4} $$

Before using area of a sector calculator, you need to learn how to find area of shaded region. For this purpose you may visit tutorial of area of a sector, it will provide you best method to calculate it.

How to find the area of the shaded region?

In the first figure, shaded area covers half the circle. So the area will be ½ multiplied by πr2. In the 2nd figure, the area of the shaded part will be ¼ πr2.

Introduction to area of sector

In the last figure the angle is 30 degrees so area of the sector will be 30/360. In this equation, πr2 is the area of the circle whereas 30/360 tells us how much of the circle is covered.

The area of sector will be θ/360° * πr2. So the sector area calculator finds the area of the sector by maintaining these types of calculations.

Learn how to calculate trapezoid area for further strengthen your concepts related to area & surface.

What is Area of Sector Calculator?

Sometimes it becomes difficult to get sector area manually on paper. Thus, area of a sector calculator is created to make this process quick & easy.

Our area of a sector calculator can be used to find sector area of a pizza, dress, land or whatever you want. Apart from that it is helpful in mathematical geometry problems etc.

How to use Area of a Sector Calculator?

Our area of a sector calculator is flexible and reliable. You can get your required area of the section by just putting radius value and angle. Click on "Calculate" button to get results instantly.

How to use area of a sector calculator

You can also use our other math related calculators like area formula rectangle calculator for learning & practice on run time.

Hopefully you've liked our sector area calculator. Please provide your valuable feedback so that we could improve further.

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Shaun Murphy

Last updated: September 09, 2020

I'm graduated in biomedical and electrical engineering. Specialization in sports and medical topics but will gladly tackle everything you throw at him. He is a sailor, hiker, and motorcyclist in his free time.

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