Gas Fee Calculator
All calculations run locally in your browser using native BigInt arithmetic — no addresses or amounts are sent anywhere.
Total Fee (ETH)
0
Estimated Fee (USD)
$0.00
How to use this gas fee calculator
- Enter the gas limit for the transaction (21000 for a simple ETH transfer, more for contract calls).
- Enter the gas price in Gwei, shown by your wallet or a gas tracker.
- Optionally adjust the ETH price to estimate the fee in USD.
How is the gas fee calculated?
The total transaction fee equals gas limit multiplied by gas price: gas limit is how much computational work the transaction is allowed to consume, while gas price is how much you pay per unit of that work, quoted in Gwei. This calculator computes the exact fee in Wei internally using BigInt, then converts it to ETH and an estimated USD value.
What's the difference between gas limit and gas used?
Gas limit is the maximum you're willing to pay for; gas used is what the transaction actually consumed. Unused gas is refunded, so this calculator's result is a worst-case estimate unless you enter the exact gas used from a completed transaction.
Is the ETH price live?
No — it's a manually editable estimate shown above, updated periodically. Enter the current market price yourself for an accurate USD figure.