# Underlying Balance

The user's underlying balance, representing their assets in the protocol, is equal to the user's bToken balance multiplied by the [Exchange Rate](/atokens/exchange-rate.md).

**BErc20 / CEther**

```
function balanceOfUnderlying(address account) returns (uint)
```

* `account`: The account to get the underlying balance of.
* `RETURN`: The amount of underlying currently owned by the account.

**Solidity**

<pre><code><strong>BErc20 bToken = BToken(0x3FDA...);
</strong>uint tokens = bToken.balanceOfUnderlying(msg.caller);
</code></pre>

**Web3 1.0**

```
const bToken = CEther.at(0x3FDB...);
const tokens = await bToken.methods.balanceOfUnderlying(account).call();
```


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