# Screen Size Calculator Explained

Last updated: March 06, 2024

## What is a screen size calculator?

A screen size calculator is an online tool or app designed to help you determine the dimensions and screen area of a TV, monitor, or projector based on the screen diagonal, width, height, aspect ratio, or screen resolution.

Understanding the dimensions of your screen is crucial in choosing the ideal TV or display for your home or office. Calculating the screen area can also help compare actual screen space between different sizes and aspect ratios.

In most cases, to use our calculator, you only need to know the screen diagonal of your TV or monitor, as most have a standard 16:9 aspect ratio. However, it's important to note that our calculator is designed to work with any aspect ratio that you may encounter.

If you're unsure about the right size for your TV screen, look at our Ideal TV Size Calculator. It will help you find the perfect size based on the distance between the screen and where you will be sitting. In addition, our TV Distance Calculator can tell you the optimal distance for sitting from the screen.

## Standard TV Size and Dimensions

Here is the TV size and dimensions cheat sheet you can reference to find the screen width, height, and area of a standard 16:9 TV, projector, and monitor.

## Screen Size Formulas

Here are the formulas used in our screen size calculator. You can use them to calculate and verify information about a TV, projector, or monitor.

### 1. Find Screen Diagonal

There are several ways to determine a screen diagonal based on your information. If you know the screen's physical width and height, use the formula below.

diagonal = √(width2 + height2)
$${diagonal} = \sqrt{width^2 + height^2}$$

### 2. Find Aspect Ratio

The screen aspect ratio is the proportion between the width and height of a TV, projector, or monitor. Three possible pairs of width and height can be used to determine the screen aspect ratio.

1. Aspect ratio - The regular TV has a standard 16:9 aspect ratio, which means that the screen contains 16 units horizontally for every nine units vertically.
2. Screen resolution - The number of pixels plotted throughout the screen horizontally and vertically. It is often written as width x height (e.g., 1920 x 1080).
3. Screen dimensions - The actual screen width and height can be obtained by measuring or consulting the specs sheet.

Regardless of which pair of width and height you have, the same value can be obtained using the following formula.

AR = width / height
$${AR} = \frac{width}{height}$$

### 3. Find Screen Width

There are two approaches to finding the screen width based on the screen information.

Formula 1

If you know the screen aspect ratio and height, use the following formula:

width = height * AR
$${width} = {height}\times{AR}$$

Formula 2

If you know the screen aspect ratio and diagonal, use the following formula:

width = AR_width * (diagonal / √(AR_width2 + AR_height2))
$${width} = width_{AR} \times \frac{diagonal}{\sqrt{width_{AR}^2 + height_{AR}^2}}$$

### 4. Find Screen Height

There are two approaches to finding the screen height based on the screen information.

Formula 1

If you know the screen aspect ratio and width, use the following formula:

height = width / AR
$${height} = \frac{width}{AR}$$

Formula 2

If you know the screen aspect ratio and diagonal, use the following formula:

height = AR_height * (diagonal / √(AR_width2 + AR_height2))
$${height} = height_{AR} \times \frac{diagonal}{\sqrt{width_{AR}^2 + height_{AR}^2}}$$

### 5. Find Screen Area

Since all the screens are rectangles, we can use the area of a rectangle formula as below:

area = width * height
$${area} = width \times height$$

## User Guide

This guide provides step-by-step instructions for using our calculator.

### How to use the screen size calculator?

Select an aspect ratio and enter a dimension to calculate.

Our calculator is straightforward to use. Finding the screen dimensions and area is just two clicks away.

• Step 1: Select an aspect ratio from the presets.
• Step 2: Enter one of the screen dimensions you know.

Everything else will be calculated instantly and automatically.

### Custom aspect ratio

If your screen aspect ratio isn't available from the presets, you can enter it yourself by clicking on the Custom button, which will show two text boxes where you can enter the ratio.

Enter a custom aspect ratio.

### Reset all fields

To quickly clear all your input, use the trash bin icon next to the Screen dimensions card.

Click the trash bin button to clear all inputs.

### Change units

Our calculator offers multiple units. When you change a unit, the value of the corresponding field is automatically calculated. You can change the measurement unit by clicking the drop-down next to the dimension you want to change.

Select the drop-down to change the unit.

## Screen Size Calculator App

Our screen size calculator is an accurate and reliable tool that can quickly determine the dimensions of any screen or media, whether it's your TV, computer monitor, photo, or video. Our calculator can find the diagonal, width, height, and area by providing the aspect ratio and one of the dimensions.

App availability

You can use the calculator for free as a PWA web app online or install it locally on any modern operating system, including Android, iOS, Windows 11/10, and macOS.

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