Free Online Ring Sizer - Accurate Ring Size Calculator Tool

🎯 Accurate

Screen calibration technology ensures precise measurements

📱 Universal

Works on all devices - mobile, tablet, desktop

🔒 Private

All measurements done locally on your device

💯 Free

Completely free with no hidden costs

Step 1: Screen Calibration

Calibrate Screen

Place a U.S. Quarter dollar within the circle below and adjust the slider until they match in size.

1.00
Tips for accurate calibration:
• Ensure your screen is at 100% zoom level
• Place the object directly on the screen
• Calibrate in good lighting conditions
• Recalibrate if you change devices or screen settings

Step 2: Find Your Ring Size

Ring Size

Use ← → arrow keys for fine adjustment
High accuracy - Screen calibrated
Measurement Details

Welcome to Ring Size App

Ring Size App is a free and easy-to-use virtual ring sizer, allowing you to place your actual ring on the screen to get an accurate size of your ring. Our advanced calibration system ensures precise measurements across different devices and screen sizes.

How to Use Ring Size App

Ring Size App is easy to use. Simply follow the steps below to find your ring size in seconds.

1. Calibrate Your Screen:

Place any calibration object (U.S. Quarter, Penny, Dime, Nickel, or Credit Card) on your screen and adjust the on-screen slider until the object perfectly aligns with the displayed circle.

This step is critical and ensures measurement accuracy for your specific screen. Choose the object that works best for you - all options provide the same accuracy. The app automatically saves your calibration settings for future use.

2. Measuring Your Existing Ring:

Place your ring on the screen. Adjust the on-screen slider until the circle matches the size of your ring. The app provides real-time size feedback as you adjust, showing both US ring sizes and international measurements.

3. Read Your Measurement:

Once steps 1 and 2 are completed you will have an accurate reading of your ring size. The app displays your ring size in multiple formats including US sizes, UK sizes, and millimeters for international compatibility.

Additional Features

  • Multiple Calibration Objects: Use quarters, pennies, dimes, nickels, or credit cards for calibration
  • International Sizing: Get ring sizes in US, UK, and metric measurements
  • Ring Style Guide: Explore different ring styles and their characteristics
  • Ring Size Chart: Reference comprehensive sizing charts for accurate measurements
  • Mobile Friendly: Works perfectly on smartphones, tablets, and desktop computers
  • No Downloads Required: Use directly in your web browser

Why Choose Ring Size App?

  • Accuracy: Advanced screen calibration ensures precise measurements
  • Convenience: No need to visit a jeweler or buy physical ring sizers
  • Free: Completely free to use with no hidden costs
  • Privacy: All measurements are done locally on your device
  • Universal: Works with any ring type and material

🌟 Why Our Ring Size Calculator is the Best Choice

Our advanced ring sizing technology combines precision measurement with user-friendly design. Unlike traditional ring sizers, our tool works instantly on any device without requiring physical tools or jeweler visits.

Perfect for:

  • Engagement ring shopping
  • Wedding ring sizing
  • Online jewelry purchases
  • Ring resizing decisions
  • Gift ring purchases
  • International size conversions

Supported Measurements:

  • US Ring Sizes (3-13)
  • UK Ring Sizes (F-Z)
  • European Sizes (44-72)
  • Japanese Sizes (4-27)
  • Circumference (mm)
  • Diameter (mm)

Frequently Asked Questions

Our online ring sizer achieves high accuracy through screen calibration using physical objects. When properly calibrated, measurements are comparable to professional jeweler tools.
Yes! Our ring sizer is fully responsive and works perfectly on smartphones, tablets, and desktop computers with the same accuracy.