The FV function calculates the future value of an investment. The future value is the lump sum or closing balance received at the end of an investment.
For example, you could use this function to calculate the return of an investment given a certain interest rate, principal, and regular payments into the investment.
FV(Interest rate, Number of periods, Payments [, Present value] [, Payment timing])
Arguments
Argument  Data type  Description 
Interest rate (required)  Number  The interest rate per period. 
Number of periods (required)  Number  The number of periods that the investment is held for, and that the interest rate applies to. 
Payments (required)  Number  The amount paid into the investment each period. 
Present value  Number  The present value of the investment at the start of the investment period. If you omit this argument, the present value is equivalent to 0. 
Payment timing  Number  Determines whether each payment is made at the start or end of each period. If a payment is made at the start of the period, that period's interest applies to it. You can enter a zero or nonzero number for this argument. If you enter:

The FV function returns a number, which is the future value of the investment.
Additional information
How FV is calculated
You can create a formula equivalent to the FV function with the structure below:
IF Rate = 0 THEN  Present value  Payments * Number of periods ELSE  Present value * POWER(1 + Interest rate, Number of periods)  Payments * (1 + Interest rate * Payment timing) * (POWER(1 + Rate, Number of periods)  1) /Interest rate
In this formula, Payment timing must either be zero for payments to be made at the start of each period, or nonzero for the end.
Positive and negative values
For any values you give the FV function via an argument, or that the function returns:
 a positive value represents money you receive, such as a dividend or loan
 a negative value represents money paid, such as a deposit or interest payment
Consistent time periods
You must use the same time period granularity for the Interest rate, Number of periods, and Payments arguments. This means that they should all consistently be monthly, quarterly, annual, or over another interval.
For example, an investment might over 3 years. In this case, there are 36 monthly periods, and you should divide the annual interest rate by 12. Additionally, any payment amounts should also be monthly.
Excel equivalent
Examples
In this example, the five items within the Contracts list are on columns. On rows, there are six line items. One for each of the arguments of the FV function, and one that uses the FV function to calculate the future value of each contract.
Contract 1  Contract 2  Contract 3  Contract 4  Contract 5  
Interest rate  0.4000%  0.7974%  0.7974%  0.4000%  0.4000% 
Number of periods  24  12  12  12  12 
Payments  300  0  300  300  300 
Present value  10,000  10,000  10,000  10,000  10,000 
Payment timing  0  0  0  0  1 
Future value
 3,464  11,000  7,238  6,810  6,796 