Is screen size measured diagonally?
Yes. A screen size measurement is the diagonal from one corner of the visible screen to the opposite corner. For example, a 27 inch monitor measures 27 inches diagonally, not across its width.
Online Tools & Utilities
Screen Dimensions
Read your screen size, resolution and refresh rate live in your browser
- Community votes0
- DR by Ahrefs0 no change since last check
Ahrefs Domain Rating set in type 6 Nov 2026, reset 5 Nov 2026.
A browser-based tool that detects your screen's resolution, pixel ratio, refresh rate and physical size using a bank card for calibration, with reference data
The story so far
Screen Dimensions reads your screen's technical specs live in your browser without sending any data to a server. It detects your display resolution in CSS and physical pixels, device pixel ratio, browser window size, refresh rate and color range. You can measure your actual screen size in inches by matching a bank card on screen, which the tool uses for calibration since every standard card is 85.6 mm wide.
The site also provides reference data for screen dimensions, with searchable pages showing width, height and diagonals for TVs, monitors, laptops and phones. It includes interactive tools like a TV size calculator based on seating distance, a screen comparison tool to view two screens side by side at scale, and screen tests for dead pixels and refresh rate verification.
All measurements are calculated from published specifications and aspect ratios, with links to manufacturers' spec sheets for verification. The site emphasizes data accuracy and privacy, never making up measurements and never storing screen information.
Typeset features
- Live screen resolution detection in CSS and physical pixels
- Device pixel ratio measurement
- Browser window size detection
- Display refresh rate checker
- Color range detection
- Physical screen size measurement with bank card
- TV size calculator by seating distance
- Dead pixel test
- Screen comparison tool at scale
- Refresh rate test
Pricing
Pricing model: Free
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Screen Dimensions metrics
| Metric | Value |
|---|---|
| Domain Rating | 0 no change since last check |
| Trust Flow | 3 no change since last check |
| Citation Flow | 4 no change since last check |
| Referring domains | 4 no change since last check |
| External backlinks | 9 no change since last check |
Ahrefs Domain Rating set in type 6 Nov 2026, reset 5 Nov 2026. Lead topic: Recreation/Travel (3). Majestic set 5 Nov 2026, reset 5 Nov 2026. Link data typeset by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
Screen Dimensions domain colophon
Read the colophon
| Domain age | 1 month |
|---|---|
| Registered | |
| Expires | |
| Registrar | NameCheap, Inc. |
| DNSSEC | Not signed |
Screen Dimensions launch colophon
Measured after Screen Dimensions went live on Zivaro Launch on 5 November 2026.
- Domain Rating (Ahrefs)
- 0
- First measured 5 Nov 2026
- Trust Flow (Majestic)
- 3
- First measured 5 Nov 2026
- Referring domains (Majestic)
- 4
- First measured 5 Nov 2026
Day 0 since launch. Next receipt: day 30, 5 Dec 2026. These are measurements, not proof of cause: many things move these numbers. Figures we have not measured are left out.
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Questions and answers
What is the difference between screen size and dimensions?
Screen size is a single diagonal measurement in inches, while dimensions are the width and height measurements. For instance, a 27 inch monitor has dimensions of 23.5 in × 13.2 in.
Can a website see my screen size in inches?
No. Browsers only report pixels and pixel ratio to websites, never physical size in inches. Any site claiming to know your inches is either guessing or asking you to measure.
How do I measure a screen without a tape measure?
Use a bank card. Every standard card is 85.6 mm (3.37 in) wide, so you can match one on screen to determine your actual pixel size.
Is my screen data private?
Yes. Every measurement runs in your browser and nothing about your screen is sent to servers. All readings are completely private.
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Screen Dimensions has a free listing. The owner can unlock the full profile with a paid launch for $5:
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