Im starting to understand how intervals work, but i really can't figure out the meaning of inversions.

I know that a perfect inverts to a perfect, minor to major etc. But let's say that i have a perfect fourth (in the scale of C) which is an F and it then inverts to a perfect fifth which is a G. Can i play these two notes together on the guitar and they will be a perfect fifth, or how does it work?
When you invert an interval, you change the quality.

The interval is dictated by the relationship of the top note to the bottom.

If you play a C-G, it's a fifth. It sounds as a fifth, and the relationship is a fifth.
If you flip it to G-C, it's a fourth. It sounds as a fourth, the relationship is a fourth.

The concept of inverting intervals is primarily for understanding and realizing symmetry and as a tool for organizing and memorizing intervals.
Last edited by chronowarp at Dec 27, 2012,
An inverstion is when you take one of the notes and move it to the otherside of the other note by an octave to create a new interval.

That might sound confusing so if you have C up to F then to invert that interval you would take the C and move it up an octave to the other side of the F. Then you would have F up to C.

Alternatively you could take the F on that original C up to F interval and move it down an octave to the other side of the C. The result would be F up to C (or C down to F).

Note that C up to F is a perfect fourth. But an interval from F up to C is a perfect fifth.

You can do this with any interval.

So with A and C: A up to C is a minor third and is the same as C down to A. The inversion of this is A down to C (or C up to A) which is a Major sixth.
An interval is two notes. I think you're confusing scale degrees and intervals.

C-F is an interval (a perfect 4th). If you invert it to F-C you get a perfect fifth.
B-D (minor 3rd) inverts to D-B (major 6th)
A-Eb (diminished 5th) inverts to Eb-A (augmented 4th)
Quote by 20Tigers
Note that C up to F is a perfect fifth. But an interval from F up to C is a perfect fourth.