Present Value is the value of asset today
Interest Rate % (per period) is the expected compunding interest rate applicable
for that period
Number of Period is the number of time periods between today and a future
date.
e.g., to calculate future value after 3 years number of periods is 3 if the interest
rate is for a year. And the number of periods will be 36 if the interest rate is
for a month
Inflation Rate % (per period) is the applicable rate of inflation for the
given period. Historically it has been around 3%. However this number can vary from
time to time, region to region
Future Value is the value of present amount in future if the amount grows
at given interest rate