If you are a general category student, you will need an AIR of around 1000 in order to get admission in B.Arch at NIT Calicut. This means you will need to have a rank of around 300 in JEE Mains Paper 2. 

Here is the cutoff for B.Arch at NIT Calicut in recent years. 

My sister appeared for JEE Mains paper-2 in 2013 and scored 228, his rank was somewhat around 5000. She got NIT-B in the 3rd round of counseling itself.