PDURATION functionThe PDURATION function returns the number of periods for an investment to reach a specific value at a given rate. Mathematically, PDURATION = (log(futureValue) – log (currentValue))/(log(1 + rate)).
Parts of a PDURATION function
PDURATION(rate, present_value, future_value)
Part
Description
rate
Required. The rate at which the investment grows each period.
present_valuepresent_value
Required. The investment’s current value.
future_valuefuture_value
Required. The investment’s desired future value.
Notes
All values must be positive and greater than 0.
Examples
PDURATION
FORMULA
1.817059493
=PDURATION(0.25, 10, 15)
3.600511394
=PDURATION(0.75, 2, 15)
Related functions
RRI: The RRI function returns the interest rate needed for an investment to reach a specific value within a given number of periods.