Screen Resolution Calculator
Calculate pixel count, aspect ratio and megapixels for any resolution.
What is Screen Resolution?
A Screen Resolution Calculator is a display tool that computes derived metrics from basic screen specifications — typically resolution (in pixels), physical screen size (in inches), and aspect ratio. From these inputs, it calculates pixel density in PPI (pixels per inch), total pixel count, and the exact aspect ratio, providing a complete technical picture of a display's characteristics.
PPI (pixels per inch) is the key metric for understanding display sharpness and clarity. Apple's Retina displays target around 220-330 PPI for devices held at typical viewing distances, while desktop monitors typically range from 90-110 PPI and phone screens go up to 500+ PPI. The calculator helps designers, photographers, and developers understand whether a screen will render content at the quality level their use case requires.
This tool is used by web designers calculating pixel-perfect layouts, video producers verifying export settings, hardware reviewers comparing display quality, UI/UX designers planning for different device categories, and photographers determining print quality from digital images.
How to Use Screen Resolution
- 1Step 1: Enter the horizontal and vertical resolution of the display in pixels. For example, for a 1920x1080 Full HD monitor, enter 1920 for width and 1080 for height.
- 2Step 2: Enter the physical screen size measured diagonally in inches. This number is the standard way screens are advertised — the diagonal measurement from corner to corner of the display area.
- 3Step 3: Click 'Calculate' to compute the results. The tool uses the Pythagorean theorem to find the diagonal pixel count, then divides by the physical diagonal to get PPI.
- 4Step 4: Review the PPI result and compare it to reference values: below 100 PPI for typical desktop viewing, 150-200 PPI for laptop screens, 250-350 PPI for phone screens considered high-density.
- 5Step 5: Check the aspect ratio calculation to confirm the display is standard widescreen (16:9), ultrawide (21:9), square, or another format, which is useful for designing content layouts.
Benefits of Using Screen Resolution
- ✓PPI Comparison: Quickly compare the pixel density of different monitors, phones, and tablets to make informed purchasing decisions or design for specific device categories with appropriate detail level.
- ✓Print Resolution Planning: Calculate whether a digital image or design has sufficient pixel density for print at a specific physical size, ensuring crisp output rather than pixelated prints.
- ✓Device-Specific Design: Knowing the PPI of target devices helps designers decide how much detail to include in icons, illustrations, and UI elements for each device category.
- ✓Video Production: Calculate the exact pixel dimensions needed for videos to display at 1:1 pixel mapping on a specific monitor, avoiding scaling artifacts in screen recordings or presentations.
- ✓Hardware Reviews: Compare display quality metrics objectively across different screen sizes and resolutions, rather than relying on marketing terms like 'HD' or 'Retina' which have inconsistent definitions.
- ✓CSS Device Pixel Ratio Context: Understanding PPI helps web developers understand why device pixel ratio (DPR) matters for serving appropriately sized images to high-density displays.
Example
About Screen Resolution
Screen Resolution displays your current screen width, height, device pixel ratio, and color depth. It also calculates the total number of pixels and the aspect ratio of your display. Useful for web developers and designers testing responsive layouts and high-DPI displays.
- Shows screen width and height
- Device pixel ratio and color depth
- Aspect ratio calculation
- Total pixel count display