Measure Your Screen Size Instantly
A free, simple tool to find your laptop or monitor screen size. No ruler needed — just match the card size and get your result.
How It Works
Three simple steps to measure your screen
Grab a Card
Get a standard credit card, ID card, or any ISO/IEC 7810 ID-1 sized card (85.6mm × 53.98mm).
Adjust the Slider
Hold the card against your screen and adjust the slider until the on-screen card matches your physical card exactly.
Read Your Result
Once matched, your screen's diagonal size, dimensions, and PPI are automatically calculated and displayed.
Common Laptop Screen Sizes
Most popular display sizes and their typical use cases
Ultra-portable, great for basic tasks and travel
Perfect balance of portability and usability
Increasingly popular for productivity work
Most common size, ideal for general use
Desktop replacement, great for gaming and design
Why Measure Your Screen Size?
Knowing your exact screen size helps with
Screen Protectors
Get the perfect fit for privacy filters and screen protectors
Laptop Bags & Cases
Choose bags and sleeves that fit your device perfectly
External Monitors
Compare sizes when shopping for secondary displays
Resale & Documentation
Accurately describe your device when selling or for records
Understanding Screen Size
Screen size refers to the diagonal measurement of a display, measured in inches from one corner to the opposite corner. This measurement doesn't include the bezel or frame around the screen. Understanding your screen size is essential for choosing the right laptop bag, screen protector, or external monitor. Our tool uses a reference object (credit card) with known dimensions to calculate your screen's pixel density (PPI), which then allows us to determine the physical size of your display.
Not Sure About Your Screen Size?
Scroll back up and use our free measurement tool. It takes less than 30 seconds!