About this:
What’s a “1:2 ratio”? And how it relates to octaves?
The statement is accurate and 1:2 is either 1/2 or 2 depending on what direction you are looking at the math.
an octave, by definition is a doubling of frequency. So that open A string (the 5th string) vibrates naturally at 110Hz in standard tuning. The octave will be double that, 220 Hz. the octave can be played at the 12th fret on that 5th string.
Does that help? if not, see if you can narrow in on the problem a bit more.
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I mean what’s this? 
. It’s a math thing? The rest of your comment is ok, I understand that.
1:2 is a ratio. I’d say that the ratio for the octave would be more accurately described as 2:1. That would mean the octave is twice the original.
I prefer thinking of doubling a frequency instead of using a ratio. It makes more sense and you won’t get it wrong if you need to think more than one octave.
Get used to the math thing. It is just some basic counting and a little multiplication or division here in music theory world.
I still don’t understand. I’m definitely not a math guy, I even searched for “1:2 ratio” on Google.
Update: Alright doing my research I think that this 1:2 ratio means 50%?
If the term “ratio” is generating a lot of trouble, then you may find the class difficult due to the terms used.
If you can multiply by 2, divide by 2, and count to 12, you should be fine. I find it mostly memorization of a set of rules.
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Oh ok then
Man I would really like to know what 1:2 ratio is or what it means 
All it means is double. If you have 1 guitar and I have 2 guitars that is a 1:2 ratio.
It I have 2 guitars and you have 1 guitar that is a 2:1 ratio.
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This I think I understand.
This is a bit confusing
I think I’m getting the idea, it’s almost like percentage? 50/50%, 75/25%, or it’s not at all?
50/50 is 1:1, 50 is the same as 50.
75/25 is 3:1, 75 is 3 times 25
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Could you give me more examples?
You’re doing it again. This is a lesson specific thread on Octaves and you have totally gone off on Ratios which you really don’t seem to understand.
It seems you like to make a big deal out of nothing.
@Richard_close2u can you clean up this thread and move Renan’s post to it’s own thread so he doesn’t continue to clog up the Octive lesson thread.
@RenanRischiotto, can I make a humble suggestion? Use chatgpt or even google to explain the concept of a ratio to you. It will be much better at explaining it to you then a series of short posts by random guitar students. And, it will explain it in Portuguese, which I believe is your native language.
That’s the most efficient way to go about it. cheers.
I see, ok then.
I actually searched on Google and used ChatGPT to explain, and now I know 
(I hope). ChatGPT is awesome. Thank you 
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Octaves = frequencies connected by scale factors of half or two.
Placing the concert pitch note of A4 in a cluster.
Standard tuning of instruments is often referred to as A440 - this literally means that the note A is tuned to be at a frequency of 440Hz. On a guitar that is the note A which you can find at fret 5 of the high E (1st) string. Other notes of A at octave intervals are available on a guitar.
1st string fret 17 = 880Hz
1st string fret 5 = 440Hz
3rd string fret 2 = 220Hz
5th string open = 110Hz
110 x 2 = 220 … as a ratio 110 : 220 = 1 : 2
220 x 4 = 440 … as a ratio 220 : 440 = 1 : 2
440 x 2 = 880 … as a ratio 440 : 880 = 1 : 2
The second value is two times bigger than the first value.
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Renan, if you have a little patience I will show you how to post properly in the right lessons thread…it’s Easter Holidays over here and I’m going to visit my family now but I’ll be glad to explain it soon.
I understand the way this Forum is structured might not be immediate to understand and sometimes new users struggle a bit at the beginning…but it’s not too complex either and we are a lot here willing to help and support eachother 
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@Richard_close2u Thank you!
You mean 220 x 2 = 440?
@Silvia80 Looks like I’m causing a lot of trouble for you guys. I’ll wait for your guide.
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