I'm using the root of C. A dorian is a a#/Bb scale, a Phrygian is a G#/Ab scale, a Lydian a G, a mixolodian is an F scale, the Locrian is a Db/c# scale (major)
This means a dorian will always be a #6, phyrgian a #5, Lydian a 5, Mixolxdian a 4, and a locrian a #1 (major)
Hope this helps.
(can also add, a major scale always has a relative minor from the 6th, so that would make a c aeolionan an Eb scale or a #2) (bit confusing, an A minor is a Cmajor, which is what I mean by a relative minor) Also good to know, because you can use a 6 minor to extend range as well. Of course It would have to be the 6th off of the alternate scale, so a mixolodian scale off of c would be a d minor,(or an F major) I'll let you figure out the math from there, but mode interval + 6minor
and feel free to correct if I'm wrong on any of my math. Pretty sure this is all right though.
BTW, the basis of my deduction is that modes follow the pattern of the major scale, whole, whole half, whole whole, whole, half, just at a different increment, so they must correspond to a different major scale. (we don't count the root note in all this, which is why only seven counts)
Can also add the importance of modes. As a keyboard player, I don't really think about them, (that's where keys are different from guitar, an F# will always be the first black key of the three, I know every note I play, modes are more a guitar thing.) I just follow the chords. Now If I'm playing a Cminor a Gminor and an Fmajor, that's a dorian scale. Its not the same as a Cminor, just a one note difference. I've moved from Fminor to Fmajor, just a single half step from Ab to A, and that makes a big difference.