The Excel PDURATION function returns the number of periods required for an investment to reach a desired value.

**Syntax**:= PDURATION (rate, pv, fv)

The PDURATION function syntax has the following arguments:

**Rate**Required. Rate is the interest rate per period.**Pv**Required. Pv is the present value of the investment.**Fv**Required. Fv is the desired future value of the investment.

PDURATION uses the following equation, where specifiedValue is equal to fv, and currentValue is equal to pv:

**Example**: Let’s look at some Excel PDURATION function examples and explore how to use the PDURATION function as a worksheet function in Microsoft Excel:

**Syntax**: =PDURATION(B1/B2,B3,B4)

**Result**:

Based on the Excel spreadsheet above, the following PDURATION examples would return:

**Syntax**: =PDURATION(B1/B2,B3,B4)**Result**: 81.30

**Syntax**: =PDURATION(B1,B3,B4)**Result**: 6.96

**Note**:

- #NUM! error – Occurs in the following situations:
- When the arguments given are negative or equal to 0.
- Any of the given arguments of the formula is in an invalid format.

- #VALUE! error – Occurs when any of the arguments in the formula uses valid data types that are non-numeric.