Can someone tell me what size the ring finger is from this picture?

No clue whatsoever. You have to have the ring in your possession or have the person size their fingers. Also many people don’t have symmetrical fingers so the left hand is a different size than the right.

In addition, the wedding ring is not worn on that finger so it will be smaller anyway.

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Thanks, you're probably right. By ringer finger I mean the traditional ring finger, not the middle finger which has the ring on in this picture. I can probably resize I suppose if necessary.

I didn't quite follow the options on this website, but it might give you some ideas:

Surprise Engagement - How to Propose without Knowing Her Finger Size (serendipitydiamonds.com)

There was something about replica rings and 6-claw rings. I don't know if anyone would let you get a couple sizes.

Probably ask a jeweler near you for some ideas to have a ring handy

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Thanks, that's helpful

Shoe size is fairly equivalent to ring finger size

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Wow. I didn't suspect anything like that.

The idea is disputed at: Is Your Ring Size the Same as Your Shoe Size? #Answered (weddingfrontier.com)

That site may give some other ideas though

View Quoted Comment I wonder if that is an old wives tale? I can say, personally, my foot size is much much larger than my ring size

I agree my shoe size is much larger than my finger size as I am a size 8 shoe size. Definitely looks like a small ring size finger the left hand fingers are always skinnier than the right hand🤔 if I had to guess I’d say she is a size 4 ring finger. I’m a size 4.75 or 5 for reference😅

I haven't ever heard of foot size relating to ring size either, and I wear size 7.5 shoe while my ring size is 5.

I hope you are able to figure out her ring size and all works out for you, good luck!

View Quoted Comment I wear a size 4 ring but size 7 shoe. I would say that’s probably not an accurate gage.

I know you said you can’t borrow rings from her, but is there a way you could sneak one out of her collection? That’s what one of my guy friends did for his fiancée.

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I second this. If you can sneak one of her rigs that's your best bet. Apparently my fiancé did this one day while I was doing a workout class (I had NO idea) and it worked out well!

You can order a ring sizer tool very inexpensively online. Then just sneak the size of her ring really quickly when she’s busy or in the rest room.

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That comparison makes some sense. The picture Tanner provides shows long skinnier fingers but still the picture does not have any known visual element, like a coin on her finger.

Another way to find out below the radar is to take a piece of string around her finger when she's sleeping and then measure it. You could also enlist the help of her friends to ask her so she doesn't suspect you're looking at rings.

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I don't get the part about avoiding checking with her friends. Maybe the friends talk too much?

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Sorry if that wasn't clear. I meant asking her friends for help. Either have them straight up ask her what her ring size was and reporting back or taking her to a jewelry store "for fun" and then letting her partner know or something like that.

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You were clear. The options you just listed could help Tanner if those ideas have not been considered yet, but the fear might be that her friends could not help while also being able to keep it a secret.

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Thank you, I was just looking at your picture and it does look similar.