# Are Gas also fees? —What’s the relationship?

Gas and gas fees are often interlaced. A gas measures the computational effort essential to execute operations, contracts, or transactions on a blockchain network. A “gas fee” is the cost required to execute the aforesaid transactions or operations on the blockchain. 

Think of gas and gas fees as petrol or gas for motor vehicles; they are required to run these robots or engines; however, they are bought at a cost. Blockchains require resources and computational efforts to help maintain their integrities. To incentivize the process and maintain a smooth running and execution process, system ops and engineers or validators require gas fees.

Using this formula, you could estimate a gas fee:

Total Fees = Gas \* Gas Price (the price per unit of gas)

You pay gas fees in Vince Chain Coin (VCE), Cosmos (ATOM), or Ether (ETH) —measured in gwei for ETH and “atto” for VCE and ATOM. Gas fees are compulsory for the smooth running of blockchains, regardless of if the transaction failed or was successful.

NOTE

It’s important you know that there could be additional fees for every transaction. These fees contrast with gas fees but are calculated alongside “gas fees.” For example, after the London Upgrade on Ethereum, additional fees were added to the base fee to incentivize the validation process and make transactions better and faster. These fees are called “priority fees,” as mentioned earlier in this documentation (link this text to the “Transactions” section).

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