> ## Documentation Index
> Fetch the complete documentation index at: https://daehan-base.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# eth_estimateGas

> Estimate gas needed for a transaction

Defined in the [Ethereum JSON-RPC Specification](https://ethereum.org/en/developers/docs/apis/json-rpc/)

<Info>
  Generates and returns an estimate of how much gas is necessary to allow the transaction to complete.
</Info>

## Parameters

<ParamField body="transaction" type="object" required>
  The transaction call object.

  <Expandable title="Transaction object properties">
    <ParamField body="from" type="string">
      The address the transaction is sent from (20 bytes).
    </ParamField>

    <ParamField body="to" type="string">
      The address the transaction is directed to (20 bytes).
    </ParamField>

    <ParamField body="gas" type="string">
      Integer of the gas provided for the transaction execution.
    </ParamField>

    <ParamField body="gasPrice" type="string">
      Integer of the gasPrice used for each paid gas.
    </ParamField>

    <ParamField body="value" type="string">
      Integer of the value sent with this transaction.
    </ParamField>

    <ParamField body="data" type="string">
      Hash of the method signature and encoded parameters.
    </ParamField>
  </Expandable>
</ParamField>

## Returns

<ResponseField name="result" type="string">
  The amount of gas used as a hexadecimal string.
</ResponseField>

<RequestExample>
  ```json Request theme={null}
  {
    "id": 1,
    "jsonrpc": "2.0",
    "method": "eth_estimateGas",
    "params": [{
      "from": "0xb60e8dd61c5d32be8058bb8eb970870f07233155",
      "to": "0xd46e8dd67c5d32be8058bb8eb970870f07244567",
      "gas": "0x76c0",
      "gasPrice": "0x9184e72a000",
      "value": "0x9184e72a",
      "data": "0xd46e8dd67c5d32be8d24c6b0afe7c5c3f4e9c3b2"
    }]
  }
  ```
</RequestExample>

<ResponseExample>
  ```json Success Response theme={null}
  {
    "id": 1,
    "jsonrpc": "2.0",
    "result": "0x5208"
  }
  ```
</ResponseExample>

## Error Handling

| Code   | Message                        | Description                               |
| ------ | ------------------------------ | ----------------------------------------- |
| -32602 | Invalid params                 | Invalid transaction parameters            |
| -32000 | Execution reverted             | Transaction would revert during execution |
| 4100   | Requested method not supported | The method is not supported by the wallet |

<Info>
  The estimate may not be accurate if the blockchain state changes between the estimation and actual execution.
</Info>