Mangalik Dosha is formed when Mars is placed in the 1st, 2nd, 4th, 7th, 8th, 12th house from the ascendant (lagna) in lagna horoscope, from the moon sign in Chandra horoscope or navmansha horoscope. If this placement of Mars happened in one of the above mentioned charts then the ill effect will be lesser. If this happened in two or all of the charts then the ill effect will be more severe.
The highest degree of this Manglik dosh is formed when mars is placed in ascendant (lagna) or the seventh house. These two placements form two most severe manglik dosh out of which placement in seventh is the most severe of all. Next in severity in decreasing order come the Mars in eighth house, then forth and then twelfth house. In addition to mars, Sun, Saturn, Rahu and ketu’s placement in the houses mentioned above also forms partial Manglik dosh.