Pixel Ruler - Measure Screen Distances Online

Measure distances on screen in pixels, centimeters, or inches

Measurement Tool

Unit:DPI:

Click to set start point

Pixel Ruler Online Free - Measure Screen Distances in Pixels, CM, Inches

Free online pixel ruler. Click two points on the canvas to measure the straight-line distance in pixels, centimeters, or inches. Adjustable DPI setting for accurate physical measurements. Visual measurement line with distance label. Perfect for web designers, UI/UX designers, and developers who need to measure screen distances without installing software.

Key Features

Click-to-measure distance tool

Supports pixels, centimeters, and inches

Adjustable DPI for accurate physical measurements

Visual measurement line with distance label

Shows all three units simultaneously after measurement

Clear button to reset measurements

Works entirely in browser

No software installation required

100% free, no registration

Why Use a Pixel Ruler?

Designers and developers frequently need to measure distances on screen — spacing between UI elements, dimensions of components, or distances in design mockups. A pixel ruler lets you do this directly in the browser without opening Photoshop, Figma, or browser DevTools. It's especially useful for quick measurements during design reviews, checking spacing consistency, and verifying that implementations match design specifications.

Benefits

•Measure UI element spacing quickly
•Verify design dimensions without opening Photoshop
•Convert pixels to real-world units (cm, inches)
•Check spacing consistency in designs
•No software installation needed
•Works on any device with a browser

How to Measure Screen Distance

1Click once on the canvas to set the start point
2Move the mouse to see the measurement line appear
3Click again to set the end point and finalize the measurement
4View the distance in pixels, centimeters, and inches
5Adjust the DPI value for your monitor for accurate physical measurements
6Click 'Clear' to reset and start a new measurement

Finding Your Screen's DPI

DPI (dots per inch) varies by monitor. Standard monitors: 96 DPI. MacBook Retina: 144-227 DPI. 4K monitors: 163-218 DPI. To find your exact DPI: search '[your monitor model] DPI' or use a DPI calculator with your screen resolution and physical size. Common values: 96 DPI (standard 1080p), 144 DPI (1.5x scaling), 192 DPI (2x/Retina). Setting the correct DPI ensures accurate cm and inch measurements.

Frequently Asked Questions

How accurate are the cm/inch measurements?

Accuracy depends on your screen's DPI. Set the correct DPI value for your monitor for accurate physical measurements.

How do I find my screen's DPI?

Search 'screen DPI' + your monitor model, or use a DPI calculator with your screen resolution and physical size. Common values: 96 DPI (standard), 144 DPI (1.5x), 192 DPI (2x/Retina).

Can I measure diagonal distances?

Yes. Click any two points on the canvas and the tool calculates the straight-line (Euclidean) distance between them, including diagonals.

Why does the canvas not fill the full screen?

The canvas is fixed at 700×400px for consistent measurements. For full-screen measurement, use a browser extension like Page Ruler Redux.

Can I measure elements on a webpage?

This tool measures distances within its own canvas area. To measure actual webpage elements, use browser DevTools (F12 → Elements → Box Model) or a screen ruler extension.

Related Keywords

pixel ruler onlinescreen rulermeasure pixels onlinepixel measurement toolonline ruler pixelsscreen distance measurerweb design rulerpixel distance calculator

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