Ethereum Gas Fee Calculator
A gas fee is simply gas units multiplied by the gas price. This calculator applies fee = gas_units times gas_price(gwei) times 10^-9 ETH, and takes a manual ETH/USD price for a dollar estimate. It runs entirely in your browser with no network call.
A plain ETH transfer costs 21,000 gas. Price is a manual input — this tool does no network call.
すべてブラウザ内で実行されます。API キー不要、データはこのページから出ません。
The fee formula
The cost of a transaction is gas_units times gas_price. Gas price is quoted in gwei, and one gwei is 10^-9 ETH, so fee in ETH equals gas_units times gas_price(gwei) times 10^-9. A plain ETH transfer uses 21,000 gas, so at 20 gwei it costs 21000 times 20 times 10^-9 = 0.00042 ETH.
Manual price, no oracle
To show a dollar figure the tool uses an ETH/USD price you type in; it makes no network call and reads no price feed. That keeps the calculation fully offline and lets you model any price scenario you like.
よくある質問
How much gas does a transaction use?
A plain ETH transfer is fixed at 21,000 gas. Contract calls use more depending on the operations executed, so use the actual gas for those.
Where does the ETH price come from?
From you. The tool takes a manual ETH/USD price and does no network lookup, so the whole calculation stays in your browser.
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