Crypto Gas Fee Calculator

How it is calculated

The fee is the gas the transaction uses times the price paid per unit of gas: fee in ETH = gas units × gas price (gwei) × 10-9, because one gwei is one billionth of one ETH. The dollar fee is fee in ETH × token price. Gas units depend on the type of transaction, and a plain ETH transfer uses 21,000. Gas price is the total gwei per unit you expect to pay, so add the base fee and the priority tip together before typing it. Token price is in dollars for one coin. The ETH figure is rounded to six decimals and is always labelled ETH. None of the inputs may be negative, and a zero in any of them gives a zero fee.

Common mistakes

• Typing the gas price in ETH or wei instead of gwei. A value like 0.000000025 will round the fee to zero; the field expects numbers such as 25.
• Using 21,000 units for every transaction. That figure is only for a plain transfer, while token swaps and contract calls use far more.
• Entering only the base fee and forgetting the priority tip, which makes the estimate too low.
• Leaving the token price at an old value. The dollar fee moves one-for-one with it.
• Treating the result as exact. The tool uses the units and price you enter, and the real gas used by a contract call is only known when the transaction runs.