Ring Size Guide: What Does 1.5cm, 1.6cm, 1.7cm & 1.9cm Mean in Ring Size?
Ring Size Guide: What Does 1.5cm, 1.6cm, 1.7cm & 1.9cm Mean in Ring Size?
Trying to figure out your ring size from a measurement in centimeters? You're not alone. Whether you've measured your finger with a string or a ruler, this guide will help you convert your centimeter measurement to the right ring size — so your 8 Other Reasons ring fits perfectly the first time.
How to Measure Your Ring Size at Home
The easiest way to measure your ring size at home is to wrap a thin strip of paper or a piece of string around the base of your finger. Mark where the two ends meet, then measure the length in millimeters or centimeters with a ruler. That measurement is your finger's circumference — use the chart below to find your size.
Alternatively, if you already own a ring that fits well, measure its internal diameter (the distance across the inside of the ring) in centimeters and use that below.
Ring Size Chart: Centimeters to US Size
| Diameter (cm) | Circumference (cm) | US Ring Size |
|---|---|---|
| 1.5 cm | 4.71 cm | Size 3 |
| 1.6 cm | 5.03 cm | Size 4 – 4.5 |
| 1.7 cm | 5.34 cm | Size 5 – 5.5 |
| 1.8 cm | 5.65 cm | Size 6 – 6.5 |
| 1.9 cm | 5.97 cm | Size 7 – 7.5 |
| 2.0 cm | 6.28 cm | Size 8 |
What Ring Size is 1.7cm?
A 1.7cm ring size corresponds to a US size 5 to 5.5. This is one of the most common ring sizes for women. If your finger's internal diameter measures 1.7cm, you'll want to order a size 5 or 5.5 depending on your preference for fit — tighter or looser.
What Ring Size is 1.6cm?
A 1.6cm ring size is approximately a US size 4 to 4.5. This is a smaller ring size, common for petite fingers or pinky rings. If you're between sizes, we recommend sizing up for a more comfortable everyday fit.
What Ring Size is 1.5cm?
A 1.5cm ring size corresponds to a US size 3 — one of the smallest standard ring sizes. If your measurement is 1.5cm, you likely have very slender fingers or are measuring for a pinky ring.
What Ring Size is 1.9cm?
A 1.9cm ring size equals approximately a US size 7 to 7.5 — a very common ring size for women, especially for statement rings worn on the middle or ring finger.
Tips for Getting the Right Fit
- Measure at the end of the day — fingers tend to be slightly larger in the evening.
- Measure when warm — cold fingers can be up to half a size smaller.
- When in doubt, size up — it's easier to size down with a jeweler than to stretch a ring larger.
- Consider the style — wider bands fit tighter, so go up half a size for thick band rings.
Shop 8 Other Reasons Rings
Now that you know your size, browse our full ring collection — from dainty gold bands to bold statement rings. All 8 Other Reasons rings are hypoallergenic and available in multiple sizes.