Ethereum transaction cost depends on gas used and effective gas price. Under EIP-1559, effective gas price combines the base fee burned by the protocol and a priority fee paid to the validator, subject to the user’s maximum fee settings.
Transparent formula
Fee in ETH = gas used × effective gas price in gwei ÷ 1,000,000,000
Worked example
A basic transfer using 21,000 gas at 20 gwei costs 0.00042 ETH. At an ETH price of $3,000, that is about
Use this sequence
- Estimate gas units for the action.
- Read current base and priority fee.
- Convert gwei to ETH.
- Convert ETH to fiat if needed.
Common mistakes
- Using 21,000 gas for every transaction.
- Confusing gas limit with gas actually used.
- Ignoring failed transaction cost.
Verify next
Frequently asked questions
What is gwei?
One gwei is one billionth of an ETH and is the common unit for gas price.
Why does a swap cost more than a transfer?
Smart-contract swaps execute many more operations and therefore use more gas.
Does the gas limit determine the final fee?
It sets a maximum execution allowance; the final fee is based on gas actually used and effective gas price.
This page provides calculation and research frameworks, not investment, legal or tax advice.
