Online Ruler UK
Screen Information
Screen Dimensions:
1280 × 720 pixels
13.33 × 7.50 inches
33.87 × 19.05 cm
Current DPI: 96.0
Calibration factor: 1.000
How to Calibrate Your Ruler
- Find a reference object (credit card: 3.37 inches, dollar bill: 6.14 inches)
- Click “Calibrate” and enter the standard size when prompted
- Measure the same object on screen using the pixel marks
- Enter the pixel length when prompted to complete calibration
Tip: A standard credit card is 3.37 inches long (85.6mm).
Your Handy Online Ruler
Getting started is easy. Just open the tool, line up what you want to measure against the screen, and read the measurement. You can switch between centimeters, inches, or pixels depending on what you need. If you're new to digital rulers, our how to use guide shows the best techniques for accurate measuring.
Pro tip: For perfect accuracy, take a moment to calibrate your screen. Since different devices display sizes slightly differently, this quick adjustment ensures your measurements are always precise. It's especially helpful if you're measuring something that needs to be exact. Also that's a perfect Compter Ruler as well as good for mobile devices.
Whether you're working on school projects, doing crafts, or just need quick measurements around the house, this tool has you covered. It's perfect for:
- Students doing homework
- Artists working on designs
- DIYers tackling home projects
- Anyone who needs instant measurements
What Reddit Users Are Saying
Other Rulers
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"This online ruler tool saved me when I needed quick measurements for a DIY project. So accurate!"
"I use this ruler daily for my design work. The pixel-perfect measurements are a game changer."
"Perfect for remote learning - my students can measure objects right on their screens. Brilliant tool!"
"As a graphic designer, I appreciate how precise this ruler is. Much better than others I've tried online."