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There are two parts to this question. First, you need to calculate the usable space on each disk, which, surprisingly, is NOT 36 GB! Disk vendors define a gigabyte as one billion bytes, but operating systems normally define it as 2^30 (1,073,741,824) bytes. So your 36 GB disks really hold just over 33 GB of files.
Next, you need to calculate the overhead of your RAID set. A RAID-5 set of N disks leaves N-1 times the space of each disk for storage. So your five disk set has the space of four disks, or 134 GB. Remember, too, that filesystems and volume managers have some overhead. Expect to use about 130 GB on your RAID set.
Read other answers to this question:
How to calculate available disk space on a RAID 5 answered by Ashley D'Costa
Calculating available disk space in a RAID-5 set answered by Brett Cooper
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