90/180 RULE I am going insane

Mark on a calendar first day and last day of time in Spain.  Count backwards from last day for 180 days.  Count how many days you used in Spain.  If less then 90 days in that 180 day period that is fine.  Plan you next stay. Count back from last day of entry and just make sure yiu have not used up more than 90 days in that 180 day period when counting back from that last date of that entry. You always count backwards but gain days to use as the days move on forwards.

Thanks for that. I have been doing it that way but not getting the answer I WANTED. Although the answer was correct. 

strange isn't it how the answer you want is never the one you get!

1. MaggieB is right. Let's not complicate the uncomplicatable. Count back and not forward from any date.

2. Remember you may be "wiping" past days too. When you write it down, it will become clearer. 

There are various free apps you can download which will do the correct calculations for you. I use them all the time and find them indispensable for obtaining maximum 90 day prr

Download a Shengen App. All you need to do is put in dates and it works everything out for tou