Screen Size & PPI Calculator

Screen Size and PPI Calculator Guide

This screen size and PPI calculator uses a display's pixel resolution and diagonal size to estimate pixel density, physical width and height, pixel pitch, aspect ratio, megapixels, and total pixel count.

It is useful for monitors, laptops, televisions, phones, tablets, and other displays when you know the native resolution and diagonal screen size.

What Is PPI?

PPI means pixels per inch. It describes how densely pixels are packed into a display.

A higher PPI means more pixels are contained within each physical inch of the screen.

The diagonal pixel count is calculated from the horizontal and vertical resolution using the Pythagorean theorem.

Example: 27-Inch 1440p Monitor

A 27-inch monitor with a resolution of 2560 × 1440 has approximately 108.79 pixels per inch.

Screen Size Calculator

Screen size is normally advertised using the diagonal measurement rather than the screen's physical width or height.

If you know the diagonal size and the display's aspect ratio, the physical width and height can be calculated.

This calculator determines the aspect ratio from the pixel resolution and then calculates the screen dimensions while preserving those proportions.

How Wide Is a 27-Inch Monitor?

The width of a 27-inch display depends on its aspect ratio. A 27-inch 16:9 screen is approximately 23.53 inches wide and 13.24 inches high, excluding the bezel.

A display with the same diagonal but a different aspect ratio will have different physical width and height.

How Wide Is a 24-Inch Monitor?

A 24-inch 16:9 display is approximately 20.92 inches wide and 11.77 inches high, excluding the frame or bezel.

Use the calculator above with the monitor's actual resolution and diagonal size for a more precise result.

How Wide Is a 32-Inch Monitor?

A 32-inch 16:9 display is approximately 27.89 inches wide and 15.69 inches high, excluding the bezel.

Ultrawide displays with the same diagonal will generally be wider and shorter because of their different aspect ratios.

What Is Pixel Density?

Pixel density is another name for the concentration of pixels on a display. For screens, it is usually expressed as pixels per inch.

Two displays can have the same resolution but very different pixel densities if their physical sizes differ.

Resolution vs Screen Size

Resolution and physical screen size describe different things.

Resolution describes the number of pixels on the screen, such as 1920 × 1080 or 3840 × 2160. Screen size describes the physical diagonal measurement, such as 24 inches or 32 inches.

PPI connects those two measurements by describing how densely the pixels are packed into the available physical space.

Common Display Resolutions

Monitor PPI Calculator

To calculate the PPI of a monitor, enter the display's native horizontal and vertical resolution along with its advertised diagonal screen size.

For example, common combinations include:

What Is Pixel Pitch?

Pixel pitch is the physical distance between adjacent pixels. It is commonly expressed in millimeters.

Higher PPI corresponds to a smaller pixel pitch because more pixels are packed into each inch.

What Is Aspect Ratio?

Aspect ratio describes the proportional relationship between screen width and screen height.

A resolution of 1920 × 1080 simplifies to a 16:9 aspect ratio. A resolution of 1920 × 1200 simplifies to 16:10.

How Are Megapixels Calculated?

Megapixels describe the total number of pixels in millions.

For example, 2560 × 1440 contains 3,686,400 pixels, or approximately 3.69 megapixels.

Is Higher PPI Always Better?

Higher pixel density can make text, images, and interface elements appear sharper at the same viewing distance, but PPI is only one characteristic of a display.

Resolution, panel technology, color performance, refresh rate, response time, brightness, viewing distance, operating-system scaling, graphics performance, and intended use can also matter.

Viewing Distance and PPI

The usefulness of additional pixel density depends partly on viewing distance. Pixels are easier to distinguish when a screen is viewed from closer distances and harder to distinguish as viewing distance increases.

This calculator reports physical screen characteristics but does not attempt to determine an ideal viewing distance.

PPI vs DPI

PPI and DPI are sometimes used interchangeably in casual conversation, but they describe different concepts.

PPI usually refers to pixels per inch on a digital display or image. DPI traditionally refers to dots per inch produced by a printer or other physical output device.

For calculating monitor or screen pixel density, PPI is the appropriate measurement.

Screen Dimensions and Bezels

The physical width and height calculated here refer to the active display area, not the complete outside dimensions of a monitor, television, laptop, or device.

Real products also include bezels, frames, housings, stands, and other components. If you need to know whether a monitor will physically fit in a specific space, use the manufacturer's full product dimensions.

Screen Size Calculator Limitations

Results are mathematical estimates based on the entered resolution and diagonal measurement. Manufacturer specifications may use rounded diagonal sizes, and actual active display dimensions may differ slightly.

The calculator assumes square pixels and a rectangular display with the same proportions as the entered pixel resolution.