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# Momentum

## Description

By measuring the amount that a security's price has changed over a given time span, the Momentum indicator provides an indication of a market's velocity and to some degree, a measure of the extent to which a trend still holds true. It can also be helpful in spotting likely reversal points.

## Syntax

`Momentum(int period)`

`Momentum(ISeries\<double\> input, int period)`

**Returns default value**

`Momentum(int period)[int barsAgo]`

`Momentum(ISeries\<double\> input, int period)[int barsAgo]`

## Return Value

**double;** Accessing this method via an index value **\[int barsAgo]** returns the indicator value of the referenced bar.

## Parameters

| Parameter  | Description                                                                                     |
| ---------- | ----------------------------------------------------------------------------------------------- |
| **input**  | Indicator source data ([Series\<T>](/developer/desktop-sdk/references/common/iseriest/seriest)) |
| **period** | Number of bars used in the calculation                                                          |

## Examples

```csharp
// Prints the current value of a 20 period Momentum using default price type
double value = Momentum(20)[0];
Print("The current Momentum value is " + value.ToString());
  
// Prints the current value of a 20 period Momentum using high price type
double value = Momentum(High, 20)[0];
Print("The current Momentum value is " + value.ToString());
```

## Source Code

You can view this indicator method source code by selecting the menu New > NinjaScript Editor > Indicators within the NinjaTrader Control Center window.