Green up confusion please help!!

[Willygubbins]

Hi Everyone,
I have found myself a lot confused, What i would like to know is if i am carrying out a trade and my aim is to double my stake is there a set percentage movement of odds that achieves this? as this is what generic green up calculators are telling me, I would've have thought that it would be reletive to the original odds taken, tick value and the number ticks availble in that particular odds range. any help gratefully recieved.

[Dallas]

Its double your stake to green up at half the odds you backed at

[Willygubbins]

Dallas, is there any way automating a green up offset based on a percent movement?