Complete His & Hers ring size guide — AU, US, UK and EU conversions, engagement ring sizing, how to secretly find your partner's ring size, and a free couples calculator
The most common Australian women's ring size is AU/UK size M–N (US 6–6.75, EU 52.5–53.8, diameter 16.7–17.1 mm). For a surprise purchase, AU size N is the safest starting point — it fits the largest number of women across Australia.
The most common Australian men's ring size is AU/UK size R–S (US 8.75–9.25, EU 58.9–60.2, diameter 18.8–19.2 mm). Men's fingers tend to be larger and sizing is less consistent — always measure directly for the most accurate result.
| AU/UK | US | EU | Diameter |
|---|---|---|---|
| H | 4 | 46.8 | 14.9 mm |
| I | 4.5 | 48.0 | 15.3 mm |
| J | 4.75 | 48.7 | 15.5 mm |
| K | 5.25 | 50.0 | 15.9 mm |
| L | 5.75 | 51.2 | 16.3 mm |
| M ⭐ | 6.25 | 52.5 | 16.7 mm |
| N 🏆 | 6.75 | 53.8 | 17.1 mm |
| O ⭐ | 7.25 | 55.1 | 17.5 mm |
| P | 7.75 | 56.3 | 17.9 mm |
| Q | 8.25 | 57.6 | 18.3 mm |
| AU/UK | US | EU | Diameter |
|---|---|---|---|
| N | 6.75 | 53.8 | 17.1 mm |
| O | 7.25 | 55.1 | 17.5 mm |
| P | 7.75 | 56.3 | 17.9 mm |
| Q | 8.25 | 57.6 | 18.3 mm |
| R 🏆 | 8.75 | 58.9 | 18.8 mm |
| S 🏆 | 9.25 | 60.2 | 19.2 mm |
| T ⭐ | 9.75 | 61.4 | 19.6 mm |
| U | 10.25 | 62.7 | 20.0 mm |
| V | 10.75 | 64.0 | 20.4 mm |
| W | 11.25 | 65.3 | 20.8 mm |
Highlighted rows represent the most commonly purchased women's ring sizes across Australia. AU size N (US 6.75, EU 53.8) is the single most common engagement ring size nationally and the best choice for a surprise proposal gift.
| 👰 AU / UK Size | 🇺🇸 US Size | 🇪🇺 EU Size | Diameter (mm) | Circumference (mm) | Guide |
|---|---|---|---|---|---|
| F | 3 | 44.2 | 14.1 mm | 44.2 mm | XS Petite |
| G | 3.5 | 45.5 | 14.5 mm | 45.5 mm | Petite |
| H | 4 | 46.8 | 14.9 mm | 46.8 mm | Petite |
| I | 4.5 | 48.0 | 15.3 mm | 48.0 mm | Small |
| J | 4.75 | 48.7 | 15.5 mm | 48.7 mm | Small |
| K ⭐ | 5.25 | 50.0 | 15.9 mm | 50.0 mm | Popular ♀ |
| L | 5.75 | 51.2 | 16.3 mm | 51.2 mm | Popular ♀ |
| M ⭐ | 6.25 | 52.5 | 16.7 mm | 52.5 mm | Most Common ♀ |
| N 🏆 | 6.75 | 53.8 | 17.1 mm | 53.8 mm | Most Common ♀ |
| O ⭐ | 7.25 | 55.1 | 17.5 mm | 55.1 mm | Popular ♀ |
| P | 7.75 | 56.3 | 17.9 mm | 56.3 mm | Popular ♀ |
| Q | 8.25 | 57.6 | 18.3 mm | 57.6 mm | Larger ♀ |
| R | 8.75 | 58.9 | 18.8 mm | 58.9 mm | Larger ♀ |
Highlighted rows represent the most commonly purchased men's ring sizes in Australia. AU size R–S (US 8.75–9.25) is the most common men's wedding band size. Men's hands vary more widely than women's — always measure directly for reliable accuracy.
| 🤵 AU / UK Size | 🇺🇸 US Size | 🇪🇺 EU Size | Diameter (mm) | Circumference (mm) | Guide |
|---|---|---|---|---|---|
| L | 5.75 | 51.2 | 16.3 mm | 51.2 mm | Small ♂ |
| M | 6.25 | 52.5 | 16.7 mm | 52.5 mm | Small ♂ |
| N | 6.75 | 53.8 | 17.1 mm | 53.8 mm | Small ♂ |
| O | 7.25 | 55.1 | 17.5 mm | 55.1 mm | Below Avg ♂ |
| P | 7.75 | 56.3 | 17.9 mm | 56.3 mm | Below Avg ♂ |
| Q ⭐ | 8.25 | 57.6 | 18.3 mm | 57.6 mm | Popular ♂ |
| R 🏆 | 8.75 | 58.9 | 18.8 mm | 58.9 mm | Most Common ♂ |
| S 🏆 | 9.25 | 60.2 | 19.2 mm | 60.2 mm | Most Common ♂ |
| T ⭐ | 9.75 | 61.4 | 19.6 mm | 61.4 mm | Popular ♂ |
| U | 10.25 | 62.7 | 20.0 mm | 62.7 mm | Popular ♂ |
| V | 10.75 | 64.0 | 20.4 mm | 64.0 mm | Popular ♂ |
| W | 11.25 | 65.3 | 20.8 mm | 65.3 mm | Large ♂ |
| X | 11.75 | 66.6 | 21.2 mm | 66.6 mm | Large ♂ |
| Z | 12.5 | 68.5 | 21.8 mm | 68.5 mm | XL ♂ |
If you cannot measure your partner's finger, their overall body height and build gives a useful starting estimate. This is a guide only — always confirm with a professional jeweller before finalising an order, as body size and finger size do not always correlate directly.
| Her Build | AU/UK Start | US Equiv. |
|---|---|---|
| Petite / Small frame | H–J | 4–4.75 |
| Slim / Below average | K–L | 5.25–5.75 |
| Average build | M–N | 6.25–6.75 |
| Above average / Tall | O–P | 7.25–7.75 |
| Larger frame | Q–R | 8.25–8.75 |
| His Build | AU/UK Start | US Equiv. |
|---|---|---|
| Slim / Small hands | N–P | 6.75–7.75 |
| Below average | Q | 8.25 |
| Average build | R–S | 8.75–9.25 |
| Above average / Tall | T–U | 9.75–10.25 |
| Large / Broad hands | V–W | 10.75–11.25 |
The only guaranteed way to get an accurate ring size is a professional jeweller measurement — but if you need to keep the proposal a secret, these methods give you a reliable starting estimate. When in doubt, always choose the larger of two sizes — resizing down is always easier than resizing up.
Quietly borrow a ring your partner wears on their ring finger and take it to a jeweller or measure its inside diameter at home with a ruler. This is the most reliable home method — always use a ring from the correct finger on the correct hand.
Place your partner's ring on paper and trace the inside circle with a pencil. Measure the diameter of the traced circle in mm and match to the size chart above. Quick and surprisingly accurate when done carefully.
Gently wrap a thin strip of non-stretch thread around your partner's ring finger base while they are asleep. Mark the overlap, measure the length in mm and enter it into the calculator above for an instant AU size.
A trusted friend or family member of your partner may already know their ring size, or can help you measure them without raising suspicion. Mothers and close sisters are often the best sources for existing engagement ring planning.
Slip one of your partner's rings onto your own finger and mark how far it goes with a pen. Take this to a jeweller and they can size the ring against your marked finger to determine the approximate size.
If you cannot determine the size at all, order AU size N (US 6.75, EU 53.8) for a woman — the single most common engagement ring size in Australia. Most jewellers offer at least one free resize within 30–90 days of purchase.
Cut a strip approximately 1 cm wide and 10 cm long. Non-stretch dental floss, thread, or thin string also works well. Avoid elastic materials that compress or stretch against the finger.
Wrap snugly around the base of the finger the ring will be worn on — the same finger and same hand. Confirm the strip can still pass over the knuckle, otherwise measure at the knuckle and round up half a size.
Use a pen to clearly mark where the strip overlaps. The distance from the strip end to that mark equals your finger circumference in millimetres.
Lay the strip against a rigid mm ruler and note the measurement. Enter it into the Couples Ring Size Calculator above for an instant AU letter result with US and EU equivalents.
Always take at least three separate measurements and use the average. Finger size varies slightly between attempts depending on warmth, activity level, and time of day.
Select a ring your partner wears regularly on their ring finger on the same hand the new ring will be worn. A ring from the opposite hand can be up to half an AU letter different in size.
Use a rigid mm ruler to measure straight across the inside opening of the ring. This is the inner diameter in millimetres — the most reliable home measurement.
Find the diameter in the full size chart for her or for him above and read across for the AU/UK letter, US size, EU size and Japan equivalent for international online ordering.
Fingers are at their largest after a full day of activity. Measuring at night — for both partners — ensures rings are comfortable at all hours and in warmer conditions rather than being sized too small on a cool morning.
Resizing a ring down is always easier, cheaper, and faster than resizing up. If you are estimating your partner's size for a surprise proposal and are unsure, always order the next half-size or full AU letter up.
Wedding bands wider than 6mm fit significantly tighter than narrow engagement rings at the same AU letter size. Both partners should go up half an AU letter from their measured size when choosing a wide wedding band.
The dominant hand's ring finger is typically half an AU letter larger. Always measure the exact hand each ring will be worn on — not the other hand for convenience. This applies to both his and her measurements.
Most plain gold and platinum bands can be resized 1–2 AU letters. Eternity rings with full-band gemstone settings cannot be resized and must be ordered in the exact size. Always confirm the resize policy before purchasing either partner's ring.
Heat causes fingers to swell; cold causes them to contract. Both partners should measure at comfortable indoor room temperature — approximately 20–22°C — for the most consistent and seasonally accurate ring size result.