# PDURATION

**Applies to:**
Calculated column
Calculated table
Measure
Visual calculation

Returns the number of periods required by an investment to reach a specified value.

## Syntax

```
PDURATION(<rate>, <pv>, <fv>)
```

### Parameters

Term | Definition |
---|---|

rate | The interest rate per period. |

pv | The present value of the investment. |

fv | The desired future value of the investment. |

## Return Value

The number of periods.

## Remarks

PDURATION uses the following equation:

$$\text{PDURATION} = \frac{log(\text{fv}) - log(\text{pv})}{log(1 + \text{rate})}$$

An error is returned if:

- rate ≤ 0.
- pv ≤ 0.
- fv ≤ 0.

This function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules.

## Example 1

The following DAX query:

```
EVALUATE
{
PDURATION(0.025, 2000, 2200)
}
```

Returns the number of years required for an investment of \$2000, earning 2.5% annually, to reach \$2200.

[Value] |
---|

3.85986616262266 |

## Example 2

The following DAX query:

```
EVALUATE
{
PDURATION(0.025/12, 1000, 1200)
}
```

Returns the number of months required for an investment of \$1000, earning 2.5% annually, to reach \$1200.

[Value] |
---|

87.6054764193714 |

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