Desktop computer monitors are available in sizes ranging from 13 to 43 inches. Some users may utilize their TV as a monitor, with screen sizes of 55 inches or more. Laptop screens generally range from 11.6 to 17 inches. While technology plays a role, generally speaking, the larger the monitor size, the higher the cost. Laptops are a bit different as features and portability weigh more heavily as far as price is concerned. For desktops, laptops, smartphones, and tablets, the monitor or screen is measured from the top-left corner to the bottom-right corner, in inches.

To determine the size of your desktop monitor, laptop screen, smartphone screen, or tablet screen, click a link below.

This page is for finding the physical size of a monitor or screen and not the screen resolution. To determine what resolution your monitor is currently set to, see: How to view or change the screen resolution of a monitor.

Desktop computer monitor - measure screen

The size of a desktop computer monitor is determined by physically measuring the screen. Using a measuring tape, start at the top-left corner and pull it diagonally to the bottom-right corner. Be sure to only measure the screen; do not include the bezel (the plastic edge) around the screen.

  • Desktop computer monitor - measure screen.
  • Desktop computer monitor - model number.
  • Laptop screen - measure screen.
  • Laptop screen - review specifications.
  • Smartphone or tablet screen - measure screen.
  • Smartphone or tablet screen - review specifications.

Desktop computer monitor - model number

The model number of the monitor includes the size of the monitor in it. For example, an Acer 20-inch screen could have a model number of S201HL. The “20” after the “S” is the size of the monitor. In general, a model number starts with one or two letters, followed by numbers. The first two numbers after the letters usually represent the size of the monitor. If you’re still unsure, a quick online search of the model number can provide you with the exact size.

Laptop screen - measure screen

The size of a laptop computer monitor is determined by physically measuring the screen. Using a measuring tape, start at the top-left corner and pull it diagonally to the bottom-right corner. Be sure to only measure the screen; do not include the bezel (the plastic edge) around the screen.

Laptop screen - review specifications

The specifications for a laptop include the size of the laptop screen. Check the laptop’s specifications for a section labeled “Screen,” “Display,” or similar. The screen size is listed in that section, in inches. If you’re still unsure, a quick online search of the laptop’s model number provides you the exact size.

Smartphone or tablet screen - measure screen

The size of a smartphone and tablet screen is determined by physically measuring the screen. Using a measuring tape, start at the top-left corner and measure diagonally down to the bottom-right corner. Only measure the screen; do not include the bezel (the plastic, metal, or glass edge), if any, around the screen.

Smartphone or tablet screen - review specifications

The specifications for a smartphone and tablet include the size of the screen. Check the specifications for a section labeled “Screen,” “Display,” or similar. The screen size is listed in that section, in inches. If you’re still unsure, a quick online search of the smartphone or tablet model number provides you the exact size.

  • How to view or change the screen resolution of a monitor.
  • Monitor, LCD, and display help and support.