What ring size is 22.5 mm?
A 22.5 mm inner diameter is outside the supported US 3–13 chart. The nearest boundary is US 13 (UK Z½, EU 70); treat it as a boundary reference, not an exact match.
Nearest supported chart boundary
- US
- 13
- UK
- Z½
- EU
- 70
- Japan
- 27
- Inner diameter, millimetres
- 22.20
- Circ mm
- 69.7
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Frequently asked questions
Is 22.5 mm inside the supported ring-size chart?
A 22.5 mm inner diameter is outside the supported US 3–13 chart. The nearest boundary is US 13 (UK Z½, EU 70); treat it as a boundary reference, not an exact match.
Is 22.5 mm a diameter or circumference?
On this page 22.5 mm is the inner diameter (the width across the inside of the ring). The matching inner circumference is about 70.7 mm.
How should I confirm a converted ring size before ordering?
Measure the same finger or a ring that fits with a second method. For an expensive, wide, or non-resizable ring, check the retailer's chart and confirm with a physical sizer or jeweller.
Values computed from the US jewellers’ diameter scale and cross-checked against ISO 8653 — methodology last reviewed 2026-08-27. Methodology