Think 3/4 size. like a student nylon string guitar. For example: 24.75 (standard Gibby scale) * 0.75=18.56 scale length. I think you're safe at 20. I just built one at 21.5 inch scale and it's a perfect fit for my 10 year old. And like Tim stated, use the 18 rule (17.817) for any scale length. I have a nifty excel sheet I created that does all the math for you, but I haven't figured out how to post it on here yet.
Read my blog on "Creating your Own Scale Length" and learn how to use the "Rule of 18" to create any scale length you want. I do to size my necks to look in symmetry with smaller boxes.
Are they 3- or 4 string? You can do a ukulele scale 13" (soprano), 15" (concert), 17" (tenor) that will suit them as they grow. I'm building some tenor ukes right now as X-mas gifts for 11 & 8 year-old girls.
I would think their ages would make a difference in size but you might try a standard ukulele size. VSL is about 20" and you should find calculator at stew-mac or other sites online. You might look at mandolin charts too.
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Thanks for the input.
Read my blog on "Creating your Own Scale Length" and learn how to use the "Rule of 18" to create any scale length you want. I do to size my necks to look in symmetry with smaller boxes.
Are they 3- or 4 string? You can do a ukulele scale 13" (soprano), 15" (concert), 17" (tenor) that will suit them as they grow. I'm building some tenor ukes right now as X-mas gifts for 11 & 8 year-old girls.
thanks for the input
I agree, 20" seems to feel right.
kids grow quick. don't make something that will soon be too small for them.
going with 20". thanks for the input.