Blog
How to Find Her Ring Size Without Asking
Most people guess, and most guesses are close enough to fix. But a ring that will not go over the knuckle at the moment you are proposing is a problem worth twenty minutes of preparation.
Here are the methods that work, roughly in order of how much you can trust them.
Borrow a ring she already owns
The most reliable approach by a distance. Take a ring she wears on her ring finger, bring it in, and we will measure it on a mandrel in under a minute.
Two cautions. Make sure it is a ring she wears on the correct finger, since most people take a different size on each hand and the right hand usually runs slightly larger. And take a ring she is not going to reach for tomorrow. A piece from the back of the jewellery box beats her everyday favourite.
If you cannot get it out of the house, press it into a bar of soap or a piece of plasticine and photograph the impression with a coin beside it for scale. Not as good as the ring itself, but usable.
Trace the inside on paper
Put the ring on paper and draw carefully around the inner edge with a sharp pencil. Photograph it flat, from directly above, with a standard coin in the shot.
The inner circle is what matters. People trace the outside, which is a band-width wider and produces a size that is consistently too large.
Ask someone who knows
Her mother, her sister, her closest friend. Often one of them knows the size outright, or can find out without raising suspicion.
Pick carefully. This is the single most common way a surprise proposal stops being a surprise. Choose the person who can keep something to themselves for six weeks, not the person who is closest to her.
The string method
Wrap string or a strip of paper around the base of her finger while she is asleep, mark where it overlaps, measure the length in millimetres.
It works, but it is easily out by a full size. String stretches, paper does not sit flat, and the base of the finger is not the widest point. Use it as a cross-check rather than your only source.
Printable sizing guides
Free online charts you print and use to measure an existing ring. Useful with a caveat: print at 100% scale with no page scaling, then verify against a coin printed on the same sheet. Almost every failure with these comes from the printer resizing the page.
Guess from build
A rough starting point. Most adult women in North America fall between size 5 and 7, with 6 and 6.5 being the most common. Slim fingers tend toward 4.5 to 5.5, average toward 6 to 6.5, broader toward 7 and up.
Treat this as a fallback rather than a plan.
Things that quietly ruin the measurement
Fingers change size through the day and through the year. They are smallest in the morning and after cold weather, largest in the evening, after exercise, after salt, and in a Toronto July. A measurement taken on a humid August afternoon can be a half size larger than the same finger in February.
Take the reading at a neutral moment, mid-afternoon at room temperature. And if she has prominent knuckles, the ring has to clear the knuckle while still sitting properly at the base, which sometimes means a slightly larger size and a fitted bar inside the band. We can do that.
If you get it wrong
It is fixable, and it happens often enough that we plan for it. Most plain and simple bands resize up or down by one or two sizes without difficulty.
Some designs are harder. Eternity bands set all the way around cannot be resized in the normal way. Tension settings and certain bezel designs are also limited, and rings with channel-set stones near the shank need careful work.
Our advice when in doubt: size slightly large. A ring that slides on and needs adjusting is a far better proposal than a ring that stops at the knuckle. Resizing after the fact takes about a week.
If the surprise is the priority, another option is to propose with the setting and choose the stone together afterwards. Settings start around $1,585, and it turns the sizing question into something you solve together rather than a gamble.
Bring a borrowed ring into our Yorkville showroom and we will size it while you wait. If you are already thinking about the design, our custom engagement ring process starts with a conversation, and our guide to choosing a style for your partner covers the part that comes after sizing.
Frequently asked questions
- How can I find my girlfriend’s ring size without her knowing?
Borrowing a ring she already wears on her ring finger is the most reliable method. Bring it to a jeweller to be measured, or press it into soap and photograph the impression with a coin for scale. - What is the most common ring size for women?
In North America, most adult women fall between size 5 and 7, with 6 and 6.5 being the most common. Use this only as a fallback, since hand shape varies widely. - Can an engagement ring be resized after proposing?
Most plain and simple bands can be resized by one or two sizes without difficulty. Eternity bands set all the way around, tension settings and some bezel designs are much harder or impossible to resize. - Is it better to size an engagement ring too big or too small?
Too big. A ring that slides on can be adjusted afterwards. A ring that will not clear the knuckle cannot be worn at all, which is a poor moment during a proposal. - Does finger size change during the day?
Yes. Fingers are smallest in the morning and in cold weather, and largest in the evening, after exercise, and in humid summer conditions. Measure mid-afternoon at room temperature for the most representative reading. - How long does resizing an engagement ring take?
About a week for most designs. Complex settings with stones near the shank take longer because the stones have to be protected during the work.
