Oura Ring 5 vs Ring 4 sizing
The short version: do not assume your Ring 4 size is your Ring 5 size. Oura lists Ring 5 in sizes 6-13 and says its sizing is slightly different from Ring 4, which runs 4-15.
| Model | Size range | Carry-over guidance |
|---|---|---|
| Oura Ring 5 | 6-13 | Use the Ring 5 sizing kit before ordering. |
| Oura Ring 4 | 4-15 | Ring 4 kit results are a reference, not a final Ring 5 order size. |
Smart-ring advisor
Smart-ring sizing advisor
If you already know your Ring 4 size
Use it only to narrow what you test first. If the old size is 4, 5, 14 or 15, it is outside the Ring 5 range. If it is 6-13, start near that number but confirm with the Ring 5 sizing kit before locking the order.
Smart-ring sizing is about sensor contact, not just circumference. Wear the sample through normal daily swelling and sleep when the brand recommends it.
Frequently asked questions
Does my Oura Ring 4 size carry over to Oura Ring 5?
Not safely. Oura says Ring 5 sizing is slightly different from Ring 4, so use the Ring 5 sizing kit instead of auto-ordering the same number.
What sizes does Oura Ring 5 come in?
Oura Ring 5 is listed in whole sizes 6 through 13.
What sizes does Oura Ring 4 come in?
Oura Ring 4 sizing runs from whole size 4 through 15.