Angular Size Calculator

Angular Size Calculator to calculate the angle, distance, and size of objects. Accurate tool for all your angular size calculations.

Do you want to solve for:
or or

Angles will be input (or shown) as:
or or

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What is Angular Size?

Angular size refers to the apparent size of an object as seen from a particular point of observation. It is commonly measured in degrees and is a fundamental concept in fields such as astronomy, photography, and engineering. Angular size is crucial for understanding how large or small an object appears in relation to its actual size.

The Basic Formula

To calculate the angular size, you can use the following formula:

Angular Size (in degrees) = \(\frac{Actual Size}{Distance}\)

How to Use an Angular Size Calculator

Now that you grasp the importance of angular size, let’s discuss how to use an Angular Size Calculator effectively:

Step 1: Select Input

Select Do you want to solve for (like; Angle, Distance, and Size) and Select Angles will be input (or shown) as (like; Degrees, Minutes, and Seconds)

Step 2: Input Distance

Next, input the distance between you and the object. For astronomers, this might be the distance from Earth to a celestial body, while photographers may use the distance from the camera to the subject.

Step 3: Input Actual Size

Begin by entering the actual size of the object you are interested in. This could be the diameter of a planet, the height of a building, or any other dimension you want to calculate the angular size for.

Step 4: Calculate Angular Size

Hit the calculate button, and the Angular Size Calculator will provide you with the angular size of the object in degrees.

Practical Applications

Now that we understand the basic concept of angular size, let’s explore some practical applications:

  • Astronomy: Angular size plays a significant role in astronomy, where it helps astronomers measure the apparent size of celestial objects such as stars, planets, and galaxies. This information is essential for understanding the universe’s vastness and the relative distances between celestial bodies.
  • Photography: Photographers use angular size to determine the field of view of a camera lens. It helps in choosing the right lens for capturing subjects at varying distances and sizes, ensuring that the desired composition is achieved.
  • Architecture and Engineering: In the fields of architecture and engineering, angular size is used to assess how structures and objects will appear from different viewpoints. This aids in the planning and design of buildings and infrastructure.

In conclusion, understanding angular size is crucial in various fields, from astronomy to photography and engineering. The Angular Size Calculator simplifies complex calculations, making it a valuable tool for professionals and enthusiasts alike. By knowing how to use this tool effectively, you can gain valuable insights into the apparent size of objects and enhance your decision-making processes.


Is the angular size the same as the actual size?

No, angular size refers to how large or small an object appears from a specific viewpoint, while actual size represents the object’s physical dimensions.

Can I use the Angular Size Calculator for everyday measurements?

Yes, you can use the Angular Size Calculator for any object as long as you know its actual size and the distance from which you are observing it.

Why is angular size important in photography?

Photographers use angular size to choose the right lens and framing for their shots, ensuring that they accurately capture the subject’s size and distance.

In this digital age, understanding angular size and having access to tools like the Angular Size Calculator can significantly enhance our ability to perceive and work with the world around us. Whether you’re a stargazer, a photographer, or an engineer, this fundamental concept can prove invaluable in your endeavors.