What Is ETH Gas? Ethereum Fees & Gwei Explained

Here’s a quick guide to Ethereum gas fees, including what they are, how they’re determined, and why they matter for your crypto portfolio.

Gas fees on the Ethereum network are determined by three variables:

• Complexity. Specifically, the amount of gas required to process a transaction.
• Base fee. The reserve price below which a transaction is ineligible for processing on the blockchain.
• Priority fee. An optional incentive fee to expedite processing time. (It’s like a theme park FastPass or a tip to the headwaiter.)

Your total Ethereum gas fee is determined by adding the base fee to the optional tip and multiplying that sum by the amount of gas used.

How do Ethereum gas fees work?

Suppose you want to buy ETH for your crypto wallet. Here’s the step-by-step process that illustrates how Ethereum gas fees work:

• You initiate a transaction. Using the platform or crypto exchange of your choice, you can initiate a transaction—to purchase ETH, in this example. You would input your desired purchase amount and other relevant information.
• You approve an estimated gas fee. The platform provides you with an estimate for the Ethereum gas fee. Many platforms and exchanges automatically evaluate current Ethereum gas fees and current network demand to suggest a gas fee that balances cost with transaction speed. If the estimated gas fee is acceptable, then you can submit the transaction for processing.
• The transaction is sent to the Ethereum blockchain. Your ETH purchase order is sent to the Ethereum network. The data included with the purchase order places an upper limit on the total gas fee that you’re willing to pay.
• A proof-of-stake validator creates a new block. Ethereum network validators assemble new blocks for the Ethereum blockchain by selecting which transactions to validate. Transactions with the highest gas fees typically get selected first, as they’re the most profitable for validators. Your transaction is generally classified as complete once it’s included in a block and the block is added to the blockchain.
• Your digital wallet balance updates. With your transaction published to the blockchain, your Ethereum balance updates and the gas fee is withdrawn. Your transaction total is the ETH purchase amount plus the gas fee.
• The validator receives gas fees. The validator that processed your transaction receives the tip portions of your gas fee and the gas fees from all the transactions in the block. The base fees are “burned”—removed from circulation—to prevent ETH currency inflation.

Why Ethereum gas fees matter for your investment portfolio

If you’re interested in owning or trading ETH, then it’s important to understand—and aim to minimize—your Ethereum gas fees.

You might already be familiar with the importance of minimizing fees as a mutual fund investor or a stock trader. Fees can eventually snowball into a big sum. So, even a seemingly small fee can have a compounding effect on the overall performance of your portfolio. Stock traders who frequently buy and sell shares can lose money on brokerage fees, and crypto traders can be caught by surprise by high gas prices.

The same principle of compounding fees applies to Ethereum gas fees and their potential overall effect on your crypto portfolio. Actively buying and selling on the Ethereum platform or participating in decentralized finance (DeFi) activities can cause you to pay gas fees that quickly add up. And—unlike the mostly predictable fees charged by stock brokerages—Ethereum gas fees can (and do) spike.

One way to think about Ethereum gas fees is to consider them in the context of your expected return on investment. If you expect a high return or place high value on an Ethereum transaction, then you may be willing to pay a higher gas fee. But the smart move for cost-conscious investors is to always minimize your gas expenses.

How to monitor Ethereum gas prices

You can minimize what you pay in Ethereum gas by monitoring the prevailing Ethereum gas price. Does that sound like a lot of work? It doesn’t have to be—plenty of online tools are dedicated to tracking gas prices on the Ethereum platform.

A few of the top gas fee monitoring tools include Etherscan, ETH Gas Station, and GasNow.* Additionally, many crypto platforms offer their own or a third party’s gas monitor.

Each of these tools provides detailed information about Ethereum gas fees for slow, medium, and fast transactions on the Ethereum network. You can also find historical information, moving averages, and leaderboards that list the biggest gas guzzlers.

Why are Ethereum gas prices so volatile?

Just like gas prices at the pump, Ethereum gas fees can be volatile. If many traders, investors, and decentralized app users want to access the Ethereum blockchain, then the network can become congested. Ethereum blockchain users may be willing to pay more generous tips for their transactions to be completed quickly, driving gas prices up.

Ethereum gas prices can decline sharply for similar reasons. If network usage is low, then validators wishing to add blocks to the chain are likely to accept low tips. The constant change in network congestion creates continuous volatility for Ethereum gas fees. Ultimately, it’s a supply and demand thing.

The bottom line

Understanding Ethereum gas fees and how they work is key to avoiding what could be a major unexpected expense. For example, you don’t want to be the one paying high Ethereum gas fees just because a trendy memecoin is creating network congestion.

Luckily you’re already on the right track just by reading this high-level overview of gas fees and how they work. If you’re transacting in ETH, be sure to monitor current gas fees and be relatively certain what the all-in (gas included) price will be.

*Specific companies and products are mentioned in this article for educational purposes only and not as an endorsement.