If you have a reference ring and want to check your ring size online without printing or using any physical tools, this method lets you find your exact size directly on screen. Just calibrate your device display, then place your ring to see its size on any phone, tablet, or computer.
Step 1: Calibrate your Screen
Let’s determine your screen’s dimensions. Then we can accurately measure your ring size.
Close one eye to measure accurately
Closing one eye helps you see more clearly without visual distortion, allowing you to align the ring precisely on screen. Make sure your eye is positioned directly above the center of the ring so the red line fits perfectly inside. The blue border should not be visible within the inner edge of the ring.
Frequently asked questions measuring your ring through a screen
Yes. This tool works on any screen device (desktop, laptop, tablet, or smartphone). Just be sure to calibrate your screen precisely using a ruler or credit card, so the displayed sizes reflect real-world measurements correctly. Note that on curved screens, accuracy may be affected if the ring doesn’t sit flat.
This tool is designed for standard circular rings. Rings with stones, elevated settings or wide decorative tops may not sit flat on the screen and can distort the result. Make sure the base of the ring rests evenly against the screen for an accurate measurement.
When properly calibrated, our screen ring sizer provides accurate results. However, for rings that require maximum precision, such as custom pieces or fine jewelry where ring sizes are measured in quarter or even eighth size increments, physical tools like ring sizer sticks or professional gauges remain the most reliable option.
Convert your US size to other systems
Our screen sizer shows results in US sizes. If you want to convert your size to another system (EU, UK, etc.), use our conversion tool for accurate results.
Ring Size Conversion Tool
Other methods determine the size of a ring at home
Printable ring size chart
Download a free ring size chart and place your ring over the circles to find a perfect match.
Metal ring sizer
A professional metal ring sizer offers accurate and consistent sizing.
Measure ring’s diameter
Place your ring on a ruler and measure the inside diameter in millimeters or inches.
User ratings for our on-screen ring size tool