Place a bank card on the screen and drag the slider until it matches.
Place any standard card from your wallet on your screen (Credit/Debit Card, Driver's License, National ID, Transit Pass, or Gift Card). All standard cards worldwide use the exact same standard: 85.60 × 53.98 mm.
Pixels per mm: 3.97
UnsavedWidth: 340px (85.60 mm) · Height: (53.98 mm)
Watch this 25-second walkthrough showing how to calibrate your screen with a standard card and find your exact ring size.
[0:00 - 0:09] Step 1 (Screen Calibration): Hold any standard card (credit/debit card, driver's license, ID) against your screen. Adjust the slider until the outline matches your card's exact 85.60 mm width to lock the 1:1 pixel pitch.
[0:09 - 0:17] Step 2 (Ring Measurement): Place your physical ring over the circle on the screen. Drag the top solitaire diamond handle until the circle precisely aligns with the inside edge of your ring.
[0:17 - 0:25] Step 3 (International Size Conversion): Instantly read your verified ring size in US, UK/AU, EU (ISO 8653), and Indian standards with inside diameter and circumference in millimeters.
Understanding the difference is critical to avoid sizing errors. All international ring size charts are built on these two core measurements.
The straight-line distance across the widest point inside the ring opening.
The complete continuous distance around the inside inner wall of the ring.
Circumference = Diameter × 3.14159 • (or Diameter = Circumference ÷ π)
A ring isn't static—your finger changes size throughout the day. Follow these jeweler-verified guidelines for a flawless, lifelong fit.
Your ring must be large enough to slide over your knuckle with gentle resistance, but snug enough not to spin or fall off at the base.
Your dominant hand (the hand you write or perform daily tasks with) is almost always approximately 0.5 to 1 full size larger than your non-dominant hand due to developed muscle tone.
Cold causes blood vessels to constrict (fingers shrink up to 0.5 size). Heat expands tissue.
Fingers are smallest early morning and reach peak circumference in the late afternoon/evening.
High sodium, alcohol, pregnancy, or dehydration trigger fluid retention, swelling fingers temporarily.
Wide bands (≥6 mm) displace more skin surface area and feel noticeably tighter than narrow bands (2–3 mm).
The interior shape of your ring changes how it feels and slides over your knuckle. Here is how to adjust your size accordingly.
Flat inner surface with sharp 90° contact edges. Common in traditional gold and silver bands.
Domed, rounded interior surface that curves outward toward the edges. Standard on modern tungsten, titanium, and platinum rings.
Order your exact measured ring size. No size adjustment needed.
If you are between two sizes, always select the smaller half-size.
Comfort-fit offset balances the width. Stick to your exact true ring size.