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Free Display Calculator

Screen Size Calculator

Calculate the exact width, height, screen area, aspect ratio, and pixel density of a TV, monitor, laptop, tablet, or other display using its diagonal screen size.

Enter Screen Details

Provide the diagonal size and aspect ratio.

Optional - for PPI

Your Screen Dimensions

Calculated from the entered screen specifications.

27"
Width
23.53 in
59.77 cm
Height
13.24 in
33.63 cm
Screen Area
311.55 in²
2,010 cm²
Aspect Ratio
16:9
Width : Height
Pixel Density
108.79 PPI
Based on 2560 × 1440 resolution
Screen sizes advertised by manufacturers usually refer to the diagonal measurement, not the screen width.

Instant Results

Get screen width, height, area, and pixel density immediately from a few simple measurements.

Multiple Measurements

View your screen dimensions in both inches and centimeters without manually converting units.

Works for Any Display

Calculate dimensions for televisions, computer monitors, laptops, tablets, and other displays.

Screen Measurement Guide

What Is a Screen Size Calculator?

Understand the actual dimensions behind a display's advertised diagonal size.

A Screen Size Calculator helps you determine the physical width and height of a display from its diagonal measurement and aspect ratio. This is useful because televisions, monitors, laptops, and other displays are normally marketed according to their diagonal size.

For example, two displays can both have a 27-inch diagonal but have different widths and heights if they use different aspect ratios. A 16:9 display will have different dimensions from a 21:9 ultrawide monitor even when their diagonal measurement is the same.

Why Screen Dimensions Matter

Knowing the actual screen dimensions is useful when planning a desk setup, buying a television stand, comparing monitors, checking whether a display fits into a specific space, or evaluating different aspect ratios.

  • Check whether a monitor fits on your desk.
  • Compare standard and ultrawide displays.
  • Estimate the visible screen area.
  • Convert screen measurements between inches and centimeters.
  • Calculate pixel density when screen resolution is known.
Simple Process

How the Screen Size Calculator Works

Calculate your display dimensions in three easy steps.

1

Enter Diagonal Size

Enter the advertised diagonal measurement of your screen and choose inches or centimeters.

2

Select Aspect Ratio

Choose a common ratio such as 16:9, 16:10, 21:9, or enter your own custom screen ratio.

3

View Screen Dimensions

The calculator instantly provides width, height, screen area, and PPI when resolution is entered.

Calculation Method

Screen Size Calculation Formula

Screen dimensions are calculated using the diagonal measurement and the selected aspect ratio.

If a display has an aspect ratio represented by W:H, the calculator uses the ratio values together with the diagonal length to calculate the physical width and height.

Width Formula

Width = Diagonal × W ÷ √(W² + H²)

Height Formula

Height = Diagonal × H ÷ √(W² + H²)

What Is PPI?

PPI stands for pixels per inch. It measures how densely pixels are packed into a display. A higher PPI generally means individual pixels are smaller and the image can appear sharper when viewed from the same distance.

To calculate PPI, enter the screen's horizontal and vertical resolution. The calculator determines the diagonal pixel count and divides it by the physical diagonal size in inches.

Common Questions

Frequently Asked Questions

Helpful answers about screen size, dimensions, aspect ratios, and resolution.

Screen size is normally measured diagonally from one visible corner of the display to the opposite visible corner. The bezel around the display is generally not included.

A 27-inch screen with a 16:9 aspect ratio is approximately 23.53 inches wide and 13.24 inches high. These measurements refer to the screen itself and do not include the monitor bezel.

No. The advertised screen size normally refers to the visible display panel measured diagonally. The physical width and height of the complete television or monitor can be larger because of bezels, frames, and stands.

A 16:9 aspect ratio means the screen has 16 units of width for every 9 units of height. It is one of the most common aspect ratios for televisions, monitors, and video content.

Screen size describes the physical diagonal measurement of a display, while resolution describes the number of pixels displayed horizontally and vertically, such as 1920 × 1080.

Yes. Select 21:9 for a typical ultrawide display or 32:9 for a super ultrawide monitor. You can also choose the custom option and enter any width-to-height ratio you need.

Suitable pixel density depends on screen size, resolution, viewing distance, and personal preference. Higher PPI generally creates finer details because more pixels are packed into each inch of the display.