Hey there! This is a very simple Instructable.
Very simple but can save you some time and money. It's completely possible to use guitar strings on your ukulele. You just need to know which guitar string to use, and for that I've created this chart which tells you just that (right-click > open in new tab):
If you're wondering how it sounds click here to see that on the YouTube video.
What's awesome with that is you can use 1 guitar string as 2 ukulele strings, because they're so long! (on most soprano ukuleles)
Step 1: Cut the guitar string in half if your ukulele is small enough
First check that it's really twice the length of your ukulele.
If, when you bend the string in half, it's still long enough to go from the saddle to the tuning pegs (see photo), plus about 3 cm, then you're good. You can cut it in half and keep the other half for the next time a string breaks!
If it's not twice the length, just use it like you would use a normal string.
Step 2: Difference between this and normal ukulele strings
The photos above show you which guitar string replaces which ukulele string. Change the string(s) you need to change and you're good!
So it's a low-G
If you change the G string for a guitar string, you now have a low-G on your ukulele (instead of having a high-G that's one octave above). It's played just the same but sounds a bit deeper. Aquila and others make low-G strings for the ukulele, and many great ukulele players prefer this to high-G.
The guitar-string low-G is totally worth low-G strings made for the ukulele. Is sounds about as good as the Aquila Red Series low-G, and lasts way longer than the Aquila wound low-G (truly, the guitar string has lasted me over a year and is still going, while the Aquila wound low-G lasted me just a week!)
Are the other strings different?
The other strings (especially the C string) sound a little bit less "sharp", a little bit more mellow that strings that are made for the ukulele. Both sounds have their own qualities. Up to you! The mellow sound give the ukulele a little bit more "guitar-y" feeling.
Anyway, hope this helped you out! Maybe you can save a couple bucks too :)
If you want to help me keep creating music, and creating free instructions like this, you can join my Patreon page: https://www.patreon.com/boxmonkey
Patreon is a great system where you can make small donations and get special perks/advantages! Even being a $1 contributor would help me out a bunch! :) Cheers!