You’ll most often hear the term among Ethereum network users, but what are crypto gas fees exactly and do they matter?

To better explain, we have created a short guide in which we’ll cover all the details you should know about. On that note, you’ll find out the purpose of gas fees, how they work, when you need to pay them, and how to calculate them.

Learn in This Article

  • What are gas fees
  • How do gas fees work
  • Importance of gas fees
  • When do you pay gas fees
  • Are gas fees high

What Are Crypto Gas Fees?

Gas fee in crypto is the term used to assign transaction fees within the Ethereum blockchain. In other words, gas is the price that network users must pay to have their transactions and smart contracts validated by the blockchain.

These crypto transaction fees are measured in gwei – small fractions of Ether and its equivalent to Bitcoin’s satoshi. Although network users choose the amount of gwei they will pay per unit of gas, its final price will depend on supply, demand, and network capacity. Moreover, the price of gas may rise during periods of high demand or major events, like new crypto launches.

In most blockchain networks, gas fees crypto transactions are processed by miners. A higher gas rate equals faster transactions. Furthermore, gas fees are a measure of the computing power required to perform transactions on the network. This means that larger transactions will have higher gas fees. All gas fees are paid in ETH.

How Does Gas Work in Crypto?

Now that you know what gas fees are in crypto, here’s how they work.

Once you initiate a transaction on the crypto exchange, the platform will automatically determine the price of the gas fee. You’ll then have to approve it — if you find it acceptable — by submitting your transaction. This transaction will then be submitted to the ETH network for validation.

Transactions with high gas fees will have priority over those with low fees. If the transaction is successful, the gas fee will be withdrawn from your wallet. At the same time, the validator will receive a percentage of the gas fee as a reward.

You can also calculate the gas fees using the following formula:

gas limit x base fee + tip = total gas fee

Gas limits refer to the maximum amount of gas you’re willing to spend on one transaction. However, if the gas limit is too low, there is a great chance that the transaction will fail. The base fee is the minimum amount you have to pay for the transaction. This fee will be determined by the network. Tips refer to extra costs. A bigger tip equals a faster transaction.

For example, if your gas limit stands at 21000 units, your base fee at 30 gwei, and you decide to add a 15 gwei tip, your total gas fee will amount to 945,000 gwei or 0.000945 ETH.

Why Are Gas Fees Important?

Gas fees have two main tasks — to compensate validators and to increase the security of the ETH network. Namely, validating transactions involves the consumption of electricity and the purchase of specialized computer equipment. Rewards within gas fees in Ethereum serve as an incentive for validators to continue working on the network.

At the same time, these fees increase the security of the Ethereum network. How so? All transactions on the network are paid, regardless of their size, which makes the ETH network less attractive to hackers. In addition to that, gas fees prevent network congestion by limiting simultaneous transactions.

And finally, gas fees contribute to decentralization. A larger number of miners indicates a smaller chance for one entity to control the network.

When Do You Pay Gas Fees Crypto?

Gas fees are paid every time an ETH network user initiates a transaction via smart contracts, whether it’s related to buying ETH or using DeFi apps and services. As mentioned before, all gas fees are paid in ETH — gwei. Once the transaction is successful, the gas fee will be withdrawn from the user’s wallet.

Why Are Gas Fees So High?

Gas fees are relatively high because their price is influenced by several factors, such as network activity and the complexity of smart contracts.

Namely, the ETH network has become very popular, which has led to a large number of users and higher activity. The more users use the network, the higher the gas fees will be, especially during the peak hours, between 8 AM to 1 PM EST. 

Network congestion — when too many people try to execute a transaction at the same time — can also lead to an increase in gas fees. The same applies to complex transactions. A complex transaction involves the execution of a smart contract that requires the use of multiple computational resources.

Other factors that can lead to a rise in gas fees are major events in the crypto world, such as the Ethereum merge, Bitcoin halving, and the launch of new tokens.

That said, gas fees are generally lowest on weekends, between 2 AM and 3 AM EST, and between midnight and 4 AM EST on weekdays.


Gas fees play a vital role in keeping the Ethereum network decentralized and secure from hacks. Their goal is to reward miners for validating transactions on the network and speed up the whole process. Gas fees are paid in ETH or gwei, and their price will depend on network capacity, the complexity of the transaction, supply, and demand.

Crypto gas fees can be calculated by multiplying the gas limit with the sum of base fees and tips.


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