As seen online:
“In the case of non-United States currency, convert the maximum account value for each account into United States dollars. Convert foreign currency by using the Treasury’s Financial Management Service rate:
https://fiscaldata.treasury.gov/currency-exchange-rates-converter/
for the last day of the calendar year.” E.,g. December 31, 2024 = 0.797 = 1.2547
— from FBAR Department of Treasury Exchange Rates 2024 as of 4 July 2025