> ## Documentation Index
> Fetch the complete documentation index at: https://docs.getpara.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Estimate Gas for Transactions

> Calculate gas costs for transactions including EIP-1559 gas pricing on React Native

Accurately estimate gas costs for transactions to ensure reliable execution without overpaying.

<Card title="Setup EVM Libraries First" description="Install and configure Ethers.js or Viem before using EVM operations" href="/v3/react-native/guides/web3-operations/evm/setup-libraries" horizontal />

<Note>
  Wagmi is not available on React Native. Use Ethers.js or Viem for EVM operations.
</Note>

## Estimate Gas for a Transaction

<Tabs>
  <Tab title="Ethers.js">
    ```typescript theme={null}
    import { ethers } from "ethers";

    async function estimateGas(
      provider: ethers.Provider,
      to: string,
      value: string,
      data?: string,
      maxFeePerGas?: string,
      maxPriorityFeePerGas?: string
    ) {
      const tx = {
        to,
        value: ethers.parseEther(value),
        data: data || "0x",
        ...(maxFeePerGas ? { maxFeePerGas: ethers.parseUnits(maxFeePerGas, "gwei") } : {}),
        ...(maxPriorityFeePerGas ? { maxPriorityFeePerGas: ethers.parseUnits(maxPriorityFeePerGas, "gwei") } : {})
      };

      const gasEstimate = await provider.estimateGas(tx);
      return gasEstimate;
    }
    ```
  </Tab>

  <Tab title="Viem">
    ```typescript theme={null}
    import { parseEther, parseGwei } from "viem";

    async function estimateGas(
      publicClient: PublicClient,
      account: Account | `0x${string}`,
      to: `0x${string}`,
      value: string,
      data?: `0x${string}`,
      maxFeePerGas?: string,
      maxPriorityFeePerGas?: string
    ) {
      const gasEstimate = await publicClient.estimateGas({
        account,
        to,
        value: parseEther(value),
        data: data || "0x",
        ...(maxFeePerGas ? { maxFeePerGas: parseGwei(maxFeePerGas) } : {}),
        ...(maxPriorityFeePerGas ? { maxPriorityFeePerGas: parseGwei(maxPriorityFeePerGas) } : {})
      });
      return gasEstimate;
    }
    ```
  </Tab>
</Tabs>

## Next Steps

<CardGroup cols={3}>
  <Card title="Send Tokens" description="Transfer ETH and ERC-20 tokens with estimated gas" href="/v3/react-native/guides/web3-operations/evm/send-tokens" icon="paper-plane" />

  <Card title="Execute Transactions" description="Execute transactions with custom gas settings" href="/v3/react-native/guides/web3-operations/evm/execute-transactions" icon="bolt" />

  <Card title="Get Transaction Receipt" description="Check transaction status after sending" href="/v3/react-native/guides/web3-operations/evm/get-transaction-receipt" icon="receipt" />
</CardGroup>