Mars is exalted in 28 degrees Capricorn because here he is in the height of the sign, which represents the achievement of ambitions.

What signs are exalted in Mars?

Sun is exalted in Aries. Moon is exalted in Taurus. Mercury is exalted in Virgo. Mars is exalted in Capricorn.

Which houses is Mars exalted?

Exalted Mars is benefic in the seventh house in most cases though it may turn malefic in some cases. This may happen when Mars is afflicted by malefic planets, such as through conjunction and/or aspects. As the number of malefic planets and the strengths of such planets increase, Mars may become more malefic.