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if you look through sushiswap's interface on github, you can sort through various methods for 'gas', like run a search/find for the method calculateGasMargin and see cannot estimate gas; transaction may fail or may require manual gas limit [ See: ] (reason=execution When I try swapping KISHU to ETH on Uniswap I get error Swap failed: cannot estimate gas; transaction may fail or may require manual gas limit. The metamask wallet does not pop up at SushiSwapis easy to use. All you have to do is visit their websiteand connect your wallet. Then select ‘Swap’ to prompt a popup that will enable you to choose the tokens you would like to exchange. Once you do this, enter the amount you want to swap, and click on Swap. Simple, right? You should be set to go as Ver más 18 de sept. de 2025 When I issue npx ts-node .ts and attempt to call out estimateGas function on sushiswap router as shown in below code snippet it triggers In this article, you’ll learn what causes this error on SushiSwap and how to fix it easily, so you can successfully complete your transaction. The “cannot estimate gas” error is It’s curious because when I transfer from one wallet to another direclty in MetaMask it works fine, but trying to do so on Uniswap / Sushiswap I’m getting this error. This error cannot estimate gas happens when you try to send a transaction that is not valid. The tooling plans that the transaction will revert, and doesn't find any good

SushiSwap Gas Estimation Errors: Troubleshooting \'Cannot Estimate Gas\'

Encountering the frustrating "cannot estimate gas" error on SushiSwap? You\'re not alone. This common issue prevents you from swapping tokens and can be confusing. This guide provides practical solutions to help you overcome this error and complete your transactions.

Understanding the \'Cannot Estimate Gas\' Error

The “cannot estimate gas” error on SushiSwap indicates that the network is unable to predict the amount of gas (Ethereum\'s transaction fee) required to execute your swap. This usually happens because the transaction is likely to fail. The tooling plans that the transaction will revert and doesn\'t find any good path for successful execution.

Common Causes and Solutions

  1. Insufficient Funds for Gas: Ensure you have enough ETH in your wallet to cover the gas fees in addition to the tokens you\'re swapping.
  2. Slippage Too Low: The price of tokens can fluctuate quickly, especially during times of high volatility. Increase your slippage tolerance. You can adjust the slippage settings within SushiSwap\'s interface. Try gradually increasing the slippage percentage until the transaction goes through.
  3. Token Contract Issues: The token you\'re trying to swap might have a problem with its contract, like a transfer restriction or a blacklisting mechanism. This is especially common with newer or less reputable tokens.
  4. Network Congestion: High network traffic can make it difficult to estimate gas accurately. Try again later during off-peak hours. You can also try increasing the gas price (although this will increase the transaction cost).
  5. Incorrect Input: Double-check the amounts of tokens you\'re entering. A small error can cause the transaction to fail. Is easy to use; you have to visit their website and connect your wallet. Then select ‘Swap’ to prompt a popup that will enable you to choose the tokens you would like to exchange. Once you do this, enter the amount you want to swap, and click on Swap.
  6. Manual Gas Limit: If other solutions fail, try setting a manual gas limit. This is an advanced technique and should be used with caution. You can try to find the method calculateGasMargin and see "cannot estimate gas; transaction may fail or may require manual gas limit [ See: ] (reason=execution". To find this method, if you look through sushiswap\'s interface on github, you can sort through various methods for \'gas\', like run a search. Overestimating the gas limit can waste ETH, but underestimating it will cause the transaction to fail and you’ll still pay for the gas used. A gas limit of 300000 is often a good starting point, but you may need to adjust it depending on the complexity of the swap.
  7. Browser/Wallet Issues: Sometimes, browser extensions or wallet configurations can interfere with gas estimation. Try clearing your browser cache, disabling unnecessary extensions, or using a different browser or wallet.

Specific Error Scenarios

Some users report this issue when swapping specific tokens. For example, some users report "When I try swapping KISHU to ETH on Uniswap I get error Swap failed: cannot estimate gas; transaction may fail or may require manual gas limit." This often indicates a problem with the KISHU token contract itself or a liquidity issue on that specific pair.

Developer Tools

Developers encountering this error while interacting with SushiSwap programmatically may find these tips helpful. One user reported: "When I issue npx ts-node .ts and attempt to call out estimateGas function on sushiswap router as shown in below code snippet it triggers" the error. This suggests an issue with the contract interaction or parameters being passed. Check your contract calls and ensure they are correct.

MetaMask Specific Issues

Some users describe "It’s curious because when I transfer from one wallet to another direclty in MetaMask it works fine, but trying to do so on Uniswap / Sushiswap I’m getting this error." This points towards potentially incorrect parameters or network selection within SushiSwap/Uniswap vs. a simple wallet transfer. Ensure you\'re on the correct network and that the token addresses are correct.

By following these steps, you can diagnose and resolve the \'cannot estimate gas\' error on SushiSwap and successfully complete your token swaps.

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