The financial institution or IRA custodian should calculate the RMD for you. Note that your RMD is based on the total value of *all* Traditional IRA accounts, but the RMD can be satisfied by taking a distribution from any IRA account. Each IRA custodian would only calculate the RMD for the IRA account that they hold.
Does Turbo Tax have a tool to compute Required Minimum Distribution for an IRA for taxpayers 70 1/2 or older? Does IRS website have such a tool?
consult the table in IRS Pub 590-B for your divisor based on your age.
Add up all your IRAs as of Dec 31 and divide.
Caution: IRS is updating the table, make sure you get the new table,
otherwise your RMD calculation will be off.
Does Turbo Tax have a tool to compute RMD? If yes, What is the cost to use it?
@JOPSLP - determining your RMD is rather simple
https://www.irs.gov/pub/irs-tege/uniform_rmd_wksht.pdf