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Gwei
Ethereum
Exploring Blockchain
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Gwei is a small unit of ETH used to measure gas prices on Ethereum. One gwei represents one-billionth of one ETH, or 0.000000001 ETH. Ethereum uses gwei because gas prices are usually too small to display conveniently in full ETH. When a user sends ETH or interacts with a smart contract, the wallet is likely to show the gas price in gwei. The total gas fee depends on the gas price, the gas limit, and how much computational work the transaction requires.
If a user sends ETH with a gas limit of 21,000 and a gas price of 20 gwei, the transaction fee is 420,000 gwei, or 0.00042 ETH.