Ring Sizing Guide by Kate Koel
Custom Fit Rings Ring Size Chart Ring Sizing
2 min read

The Ultimate 2026 Ring Sizing Guide: How to Find Your Perfect Fit at Home

The Precision Paper Strip Method: A Step-by-Step DIY

For a quick estimate of your ring size at home, the paper strip method is the most reliable "low-tech" solution.

  1. Cut: A strip of non-stretchy paper approximately 10mm wide.
  2. Wrap: Snugly around the base of the finger and the knuckle.
  3. Mark: Use a fine-point pen to mark exactly where the paper overlaps.
  4. Measure: Use a millimeter ruler to find the Circumference

Master Ring Size Chart: US Sizes 2–13 (Including Quarter Sizes)

Comprehensive US ring size chart for sizes 2 to 13 including quarter and half sizes with inside circumference measurements in millimeters for Kate Koel artisan jewelry.

Measuring by Inside Diameter: The "Existing Ring" Method

If you already own a ring that fits perfectly, you can determine your US ring size. Measure its Internal Diameter. It is critical to measure the space inside the band, excluding the thickness of the metal itself. Even a fraction of a millimeter (the width of a fingernail) can represent a half-size difference. For the most accurate result, use a Digital Caliper or a ruler with clearly defined millimeter (mm) markings. Place the "zero" mark on the inside left edge. Measure straight across the widest center point to the inside right edge.

Accurate ring sizing guide showing inside diameter in millimeters for US sizes 2-13. Ideal for measuring existing rings to find a perfect fit in whole, half, and quarter sizes.

 Using Technology: The Best Ring Sizer Apps

If you already have a ring that fits, use a Digital Ring Sizer. Apps like Ring Sizer by Jason Withers allow you to:

  • Place your ring directly on your phone screen.
  • Adjust a digital slider to match the inner diameter.
  • Instantly see your size in US, UK, or EU scales.

The Pro-Fit Guarantee: Your Ring Sizer

We want your first ring order to feel just right. To take the guesswork out completely, you can order a professional ring sizer before choosing your rings. This belt-style gauge is an industry-standard tool designed to measure your size accurately, including half sizes, so you can feel confident before investing in your next heirloom piece. The cherry on top, it ships with no additional cost.

Explore our ring collection.

Frequently Asked Questions (FAQ)

  • What if I’m between sizes? Always go with the larger size to account for natural swelling.
  • How should a ring feel? It should slide on easily but offer "slight resistance" when passing back over the knuckle.
  • Does temperature affect size? Yes. Measure your finger at the end of the day when your hands are warm; cold fingers are significantly thinner.