> For the complete documentation index, see [llms.txt](https://docs.bancor.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bancor.network/developer-guides/read-functions/pool-token-information/pooltokentounderlying.md).

# poolTokenToUnderlying()

### Function poolTokenToUnderlying()

{% code title="NetworkSettings.sol" %}

```javascript
function poolTokenToUnderlying(Token pool, uint256 poolTokenAmount) external view returns (uint256)
```

{% endcode %}

{% hint style="success" %}
This function is located in the [BancorNetworkInfo](/developer-guides/contracts.md#bancor-v3-contracts) contract
{% endhint %}

This function returns the number of underlying tokens a pool token is worth. 

### Function Arguments

| Name            | Type    | Description                                                                                                                                                                                                                         |
| --------------- | ------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| pool            | Token   | <p>Input the contract address of a token. </p><p></p><p>For example for the <a href="https://etherscan.io/token/0x514910771af9ca656af840dff83e8264ecf986ca">LINK</a> token: <em>0x514910771AF9Ca656af840dff83E8264EcF986CA</em></p> |
| poolTokenAmount | uint256 | The number of bnTokens for which to check the underlying amount.                                                                                                                                                                    |

### Return Variables

This function returns the number of underlying tokens a given amount of pool tokens are worth.&#x20;

| Variable Type | Returns                                                                                                                                                 |
| ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Number        | <p>The number of tokens a given pool token is worth. <br><br>For example, the response will indicate the value of the input amount in LINK tokens. </p> |