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FitLock — Ring & Sleeve Sizer
Measure once, shop with confidence. Your fit stays private on this page.
Remove immediately if you feel numbness, pain, coldness, or discoloration. Don't sleep in a ring.
1) Tell us your numbers
Base circumference
Wrap a soft tape at the base (in)
Or diameter
Measure straight across the base (in)
Optional: length
(for sleeve length suggestion)
Fit preference
2) Your size
Enter your base measurement and fit preference, then calculate.
Ring size reference (internal diameter)
| Label | Diameter (mm) | Diameter (in) | Circ (mm) | Circ (in) |
|---|---|---|---|---|
| XS (40mm) | 40 | 1.57 | 126 | 4.95 |
| S (45mm) | 45 | 1.77 | 141 | 5.57 |
| M (50mm) | 50 | 1.97 | 157 | 6.18 |
| L (55mm) | 55 | 2.17 | 173 | 6.80 |
| XL (60mm) | 60 | 2.36 | 188 | 7.42 |
| XXL (65mm) | 65 | 2.56 | 204 | 8.04 |
Tip: If you're between sizes, choose the larger for comfort — especially for longer wear.
