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You don’t need toknow the exact size

If the ring doesn'tfit, we'll replace it

Not just a gift — a feeling that lasts — just place your order

Size Guidefor Surprise Gifts

Not sure
about the size? We’ve got you covered — the surprise stays a surprise.

KOTAOSTA is all about emotions.

But if you want the ring to fit perfectly from the start, here are 4
simple and discreet ways to measure your loved one’s finger size —
without spoiling the surprise.

Open an app like
Ring Sizer by Jason Withers

Place the ring directly on your phone screen and match it to the right size

📲 Fast, easy, accurate — and 100% stealth

Open a sizing app or size chart on your phone

While she’s asleep or resting, carefully place her finger on the screen

Align her finger with the circles to estimate the size

Or take a photo of her finger and send it to us — we’ll help!

💤 Works great at night — just a little light and finesse required

Have them casually try on rings together at a store

Ask them to take a photo of her hand with a ring

Or ask directly — without giving away the surprise

💡 Your secret allies can make the difference

Download and print our PDF ring size chart

Place her ring on the circles and find the closest match

Or use the included paper strip to measure her finger discreetly

🖨️ Simple and accurate — just follow the instructions carefully

Still not sure?

KOTAOSTA rings are made to adapt.

If the size isn’t perfect — we’ll replace it for free.

Buy it. Gift it. Enjoy the moment. Size is never an
issue.

Ring Size Conversion Chart

US Size EU Size Inner Diametr (mm)
4.047.015.0
4.5 48.0 15.3
5.0 49.0 15.7
5.5 50.0 16.1
6.0 51.0 16.5
6.5 52.0 16.9
7.0 54.0 17.3
7.5 55.0 17.7
8.0 57.0 18.1
8.5 58.0 18.5
9.0 59.0 18.9
9.5 60.0 19.3
10.0 62.0 19.7
10.5 63.0 20.1
11.0 65.0 20.6