As per the hadith, the mahr of the holy wives and daughters of the holy Prophet Muhammad (صلى الله عليه وسلم) was five hundred dirhams. In some hadith the quantity of mahr Fatmi is mentioned 480 dirham. The weight of five hundred dirhams as per the current gram is 1530.9g silver while the quantity of 480 dirhams is 1469.664g silver. You may learn the calculation of said weight in Indian rupees from the market.
Note: The mahr of Umm Habibah (رضى الله عنها) was 1100 dirhams. The nikah of Umm Habibah (رضى الله عنها) was performed by Najashi, the king of Habsha and he himself took the responsibility to pay it. (L)
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband