Screen Size Calculator

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.

Screen dimensions of a 55-inch screen — Screen dimensions of a 55-inch TV.

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.

Size	Width	Height	Area
32"	27.89" 70.84 cm	15.69" 39.85 cm	437.55 in² 2,822.93 cm²
40"	34.86" 88.55 cm	19.61" 49.81 cm	683.68 in² 4,410.83 cm²
43"	37.48" 95.19 cm	21.08" 53.55 cm	790.08 in² 5,097.26 cm²
50"	43.58" 110.69 cm	24.51" 62.26 cm	1,068.25 in² 6,891.92 cm²
55"	47.94" 121.76 cm	26.96" 68.49 cm	1,292.58 in² 8,339.22 cm²
60"	52.29" 132.83 cm	29.42" 74.72 cm	1,538.28 in² 9,924.36 cm²
65"	56.65" 143.9 cm	31.87" 80.94 cm	1,805.34 in² 11,647.34 cm²
70"	61.01" 154.97 cm	34.32" 87.17 cm	2,093.77 in² 13,508.16 cm²
75"	65.37" 166.04 cm	36.77" 93.39 cm	2,403.56 in² 15,506.81 cm²
80"	69.73" 177.1 cm	39.22" 99.62 cm	2,734.72 in² 17,643.31 cm²
85"	74.08" 188.17 cm	41.67" 105.85 cm	3,087.24 in² 19,917.64 cm²
98"	85.41" 216.95 cm	48.05" 122.04 cm	4,103.79 in² 26,475.99 cm²

Table of standard TV sizes and areas in inches and centimeters.

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.

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.
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).
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.

Table of contents:

How to use the screen size calculator?
Custom aspect ratio
Reset all fields
Change units

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.

When you enter both values, the screen preview will help you visualize your input and verification.

Reset all fields

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

Reset all the fields in Screen Size Calculator

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.