Your scope is probably marked off in 1/4 moa increments so, 1/4 moa is 1 click past a full increment mark and 3/4 moa is 3 clicks past a full increment mark.
If you have to go up 30 3/4 moa just go up 30 moa, which in the case of 15 moa per full turn, would be 2 full turns from zero and then go 3 clicks more and you should be there.
For me it's way quicker to dial in moa increments, and full turns, than it is to count clicks. Don't even remember when the last time was that I counted clicks. I just like to do it quick and easy so I can get on with the shot and have fun.