# eth\_estimateGas

{% hint style="info" %}
**Params**

See [eth\_call](broken://pages/DZLDOoiPnmyBKaT0QCUP) parameters, expect that all properties are optional. If no gas limit is specified geth uses the block gas limit from the pending block as an upper bound. As a result, the returned estimate might not be enough to execute the call/transaction when the amount of gas is higher than the pending block gas limit.
{% endhint %}

### Returns

`QUANTITY` - the amount of gas used.

### Example

Request

```
curl https://rpc-mainnet.u2u.xyz \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_estimateGas","params":[{see above}],"id":1}'
```

Result

```javascript
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x5208" // 21000
}
```


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