What is the equivalent of 400 Dirhams from the era of the Prophet, peace and blessings be upon him, in our current time?

The amount of 400 Dirhams can be known by determining its weight in silver. The religious nisab (threshold) for silver is 200 Dirhams, which is 595 grams. Therefore, 400 Dirhams is equivalent to 1190 grams of silver. Its value in local currency can be ascertained by asking trustworthy merchants.