Crypto network fee estimator

Work out what a transfer will cost in network fees before you send it. Enter the numbers your wallet shows: for Ethereum, the gas the transaction uses and the base fee and tip in gwei; for Bitcoin, the transaction size in virtual bytes and the fee rate in sat/vB. Add a coin price if you want the fee in your own currency. Everything is calculated in your browser; nothing is sent or saved, and CoinX does not set network fees.

Ethereum (gas) Gas used (units)

21,000 is the gas a plain ETH transfer uses (ethereum.org). Token transfers and contract calls use more; copy the figure your wallet shows.

Base fee (gwei) Priority fee / tip (gwei) ETH price in your currency (optional)

Enter the gas used and the base fee to see the fee.

Bitcoin (sat/vB) Transaction size (vbytes)

Size depends on how many inputs and outputs the transaction has, not on the amount sent.

Fee rate (sat/vB) BTC price in your currency (optional)

Enter the size and fee rate to see the fee.

How it is calculated. Ethereum: fee = gas used × (base fee + priority fee), and 1 gwei = 0.000000001 ETH. Bitcoin: fee = size in vbytes × fee rate in sat/vB, and 1 sat = 0.00000001 BTC. On Ethereum your wallet may reserve a higher maximum fee; the unused part is refunded. A failed Ethereum transaction still pays for the gas it used.

Learn what drives these numbers in Crypto network fees explained: gas, Bitcoin fee rates and TRON energy. Educational tool, not financial advice.