> ## 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

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};

Accurately estimate gas costs for transactions to ensure reliable execution without overpaying. This guide covers gas estimation for simple transfers and smart contract interactions using <Link label="Ethers.js" href="https://docs.ethers.org/v6/api/providers/#Provider" />, <Link label="Viem" href="https://viem.sh/docs/actions/public/estimateGas" />, and <Link label="Wagmi" href="https://wagmi.sh/react/hooks/useEstimateGas" />.

## Prerequisites

You need Web3 libraries configured with Para authentication.

<Card title="Setup Web3 Libraries" description="Configure Ethers.js, Viem, or Wagmi with Para before proceeding" href="/v3/react/guides/web3-operations/evm/setup-libraries" />

## 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>

  <Tab title="Wagmi">
    ```typescript theme={null}
    import { useEstimateGas } from "@getpara/react-sdk/wagmi";
    import { parseEther, parseGwei } from "viem";

    function EstimateGas({
      to,
      value,
      data,
      maxFeePerGas,
      maxPriorityFeePerGas,
    }: {
      to: `0x${string}`;
      value: string;
      data?: `0x${string}`;
      maxFeePerGas?: string;
      maxPriorityFeePerGas?: string;
    }) {
      const { data: gas } = useEstimateGas({
        to,
        value: parseEther(value),
        data: data || "0x",
        ...(maxFeePerGas ? { maxFeePerGas: parseGwei(maxFeePerGas) } : {}),
        ...(maxPriorityFeePerGas ? { maxPriorityFeePerGas: parseGwei(maxPriorityFeePerGas) } : {})
      });

      return (
        // Your component JSX here
      )
    }
    ```
  </Tab>
</Tabs>