> ## 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

export const Link = ({href, label, newTab = false}) => {
  const [isHovered, setIsHovered] = useState(false);
  return <a href={href} target={newTab ? '_blank' : '_self'} rel={newTab ? 'noopener noreferrer' : undefined} className="not-prose inline-block relative text-black font-semibold cursor-pointer border-b-0 no-underline" onMouseEnter={() => setIsHovered(true)} onMouseLeave={() => setIsHovered(false)}>
      {label}
      <span className={`absolute left-0 bottom-0 w-full rounded-sm bg-gradient-to-r from-orange-600 to-purple-600 transition-all duration-300 ${isHovered ? 'h-0.5' : 'h-px'}`} />
    </a>;
};

export const Card = ({imgUrl, title, description, href, horizontal = false, newTab = false}) => {
  const [isHovered, setIsHovered] = useState(false);
  const handleClick = e => {
    e.preventDefault();
    if (newTab) {
      window.open(href, '_blank', 'noopener,noreferrer');
    } else {
      window.location.href = href;
    }
  };
  return <div className={`not-prose relative my-2 p-[1px] rounded-xl transition-all duration-300 ${isHovered ? 'bg-gradient-to-r from-[#FF4E00] to-[#874AE3]' : 'bg-gray-200'}`} onMouseEnter={() => setIsHovered(true)} onMouseLeave={() => setIsHovered(false)}>
      <a href={href} onClick={handleClick} className={`not-prose flex ${horizontal ? 'flex-row' : 'flex-col'} font-normal h-full bg-white overflow-hidden w-full cursor-pointer rounded-[11px] no-underline`}>
        {imgUrl && <div className={`relative overflow-hidden flex-shrink-0 ${horizontal ? 'w-[30%] rounded-l-[11px]' : 'w-full'}`} onClick={e => e.stopPropagation()}>
            <img src={imgUrl} alt={title} className="w-full h-full object-cover pointer-events-none select-none" draggable="false" />
            <div className="absolute inset-0 pointer-events-none" />
          </div>}
        <div className={`flex-grow px-6 py-5 ${horizontal ? 'w-[70%]' : 'w-full'} flex flex-col ${horizontal && imgUrl ? 'justify-center' : 'justify-start'}`}>
          {title && <h2 className="font-semibold text-base text-gray-800 m-0">{title}</h2>}
          {description && <div className={`font-normal text-gray-500 re leading-6 ${horizontal || !imgUrl ? 'mt-0' : 'mt-1'}`}>
              <p className="m-0 text-xs">{description}</p>
            </div>}
        </div>
      </a>
    </div>;
};

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="/v2/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>