Find Your Perfect Ring Size in 3 Easy Ways
1. Digital Ring Sizer
Calibrate with a credit card and measure directly on screen
3. Photo Measurement
Upload a photo of your ring with a reference object
Step 1: Calibrate Your Screen
Place a standard credit card (85.6 mm wide) below and adjust the slider until the red bar matches the card's width exactly.
Step 2: Measure Your Ring Size
Your Ring Size:
Alternative: Photo Measurement Method
- Place your ring on a flat surface next to a credit card or ruler
- Take a clear photo from directly above
- Upload the photo below
- Click on two points to mark the reference width
- Click on two points to mark the ring diameter
How to Accurately Measure Your Ring Size at Home
Finding the perfect ring size is essential for comfort and security. Our free online ring sizer tool provides three accurate methods to determine your ring size without visiting a jeweler. Whether you use our digital measurement tool, printable ring sizer, or photo analysis method, you'll get professional-level accuracy from home.
Why Accurate Ring Sizing Matters
A properly sized ring should slide over your knuckle with slight resistance but fit comfortably without feeling tight. Rings that are too small can be difficult to remove, while loose rings risk slipping off and getting lost. Our ring measurement tool helps you avoid these issues by providing precise measurements converted to standard US, UK, and European ring sizes.
Tips for Best Results
- Measure your finger at the end of the day when fingers are typically at their largest
- Ensure your screen is calibrated properly using the credit card method
- If using the printable ring sizer, verify the scale by checking the calibration square
- For the most accurate measurement, consider using multiple methods
Need a Physical Measurement?
Download our printable ring sizer guide with calibration markers to verify actual size when printed.
Download Printable Ring SizerFrequently Asked Questions
How accurate is the online ring sizer?
Our online ring sizer is highly accurate when properly calibrated. Using the credit card calibration method, you can achieve accuracy within ±0.5 ring sizes. For best results, ensure you're printing at 100% scale and calibrating carefully.
Can I use the ring sizer without a printer?
Yes, our digital ring sizer allows you to measure directly on screen after calibration with a standard credit card. You can also use the photo measurement method by taking a picture of your ring next to a reference object.
What if I don't have a credit card for calibration?
You can use any object with a known standard size, such as a driver's license (54mm wide) or US bill (66.3mm wide). Alternatively, use our printable ring sizer which includes calibration markers.
How do I measure ring size with a string?
Wrap a non-stretchable string around your finger, mark where it overlaps, then measure the length in millimeters. Use our conversion tool to find your corresponding ring size based on the circumference.
What's the difference between US and UK ring sizes?
US ring sizes use a numerical scale (typically 3-13 for adults), while UK sizes use alphabetical letters (A-Z). Our tool automatically converts between different sizing systems to give you the correct measurement.
How should a properly sized ring fit?
A properly sized ring should slide over your knuckle with slight resistance but fit comfortably without feeling tight. It shouldn't easily fall off but should allow for finger swelling in different temperatures.