Guess Ring Size
Answer a few quick questions and get an estimated size range, a best-guess starting size, and a confidence score — built for when you can't ask directly.
How it works
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Pick who you're shopping for
Select gender, approximate height, and body frame. These three signals set the baseline for the estimate.
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Describe the ring
Choose the finger, hand, ring type, and band width. A wide band on the ring finger sizes differently than a thin one on the middle finger.
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Add any conditions
Climate and time of day both affect finger size. The more questions you answer, the higher your confidence score.
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Get your estimate
You'll see a size range, a best starting size, and a confidence score — plus a clear next step if a real measurement would serve you better.
Answer the questions and select Get my estimate to see your result here.
Estimated US size range
US –
Best starting size
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Confidence
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UK
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EU
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Japan
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When to see a jeweler
Frequently asked questions
What if the estimate turns out to be wrong?
Most jewelers offer one free resize within the first 60–90 days of purchase, especially for engagement rings. Choose a retailer with a clear resizing policy, and favor styles that are easier to resize — plain bands and solitaires — over eternity bands or rings with stones set all the way around.
Should I size up or down if I'm between two results?
Size up. It's almost always easier and cheaper for a jeweler to make a ring smaller than to make it bigger, and some styles can't be enlarged at all.
What's the most reliable way to get a more accurate size discreetly?
Borrow a ring they already wear on the correct finger — even for a few minutes — and measure its inner diameter with a ruler using the Ring Size Calculator. Tracing the inside edge of the ring onto paper works too if you can't measure it directly.
Does this work if I'm proposing to a man, or for a same-sex couple?
Yes. Choose whichever starting point best matches the person you're shopping for — this only adjusts the baseline, since average ring sizes differ slightly between men and women. Every other input, like height, frame, and ring type, works the same way regardless of who you're shopping for.
How is the confidence score calculated?
It starts from a baseline and adjusts based on how much certainty your answers provide. Knowing the gender and body frame increases confidence, while not knowing which hand or finger the ring is for slightly reduces it. A High confidence result (80 or above) is typically accurate within about a quarter size; a Medium result (72–79) is a reasonable estimate but worth double-checking; a Low result (below 72) should be treated as a rough starting point only. Whenever the score comes in below 80, we'll suggest using the Ring Size Calculator instead for a more reliable result.
Go further
More tools and reading to help you get it right.