THE SHELBY SIZE GUIDE
Find your fit.
A card, a ring, a little precision. Match your screen to a real card, then measure a ring you already love.
Loading the interactive ring sizer…
Match your card
Hold a standard bank card against the screen. Adjust the shape until its outside edges match your card in both directions.
Match a standard 85.60 × 53.98 mm bank card. Use portrait if it will not fit. No photo or card details needed.
Match the card, then confirm to unlock your measurement.
Match your ring
Place a well-fitting, round ring over the circle. Adjust until the outside edge of the gold circle just touches the ring’s inside edge all the way around.
YOUR APPROXIMATE SIZE
Calibrate first
Your measurement will appear here.
- Inside diameter
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- Inside circumference
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Use a ring that fits the intended finger. Keep the card and ring flat, look straight at the screen, and avoid pressing hard.
A few things to know
This is a screen-based estimate, not a guaranteed fit. A jeweller can confirm your size, particularly for wide bands, comfort-fit rings or rings that are not perfectly round.
Keep the same browser zoom and screen while measuring. Recheck the card after zooming, rotating your device, resizing the window or moving it to another monitor. Some display changes cannot be detected automatically.
Sizes shown are the nearest US half-size and its reference UK/Australian letter, using the GIA chart. They are not a verified Shelby product-size conversion. Compare the measured diameter with the product’s size chart before ordering.
No information is uploaded or saved. Calibration lasts only while this page remains open. This interactive guide is not designed for printing.