ETH Unit Converter

What is a Wei? It's the smallest unit of ETH, where 1 ETH = 10^18 wei. It's the unit the Ethereum network works in — when you send 1 ETH, the nodes read it as sending 1000000000000000000 wei.

What is Gwei? It's another unit of ETH, the one gas prices are often expressed in. 0.000000001 ETH = 1 gwei = 1000000000 wei. If a transaction has a gas limit of 21,000 units and the network gas price is 1 gwei, you can calculate the fee in ETH as 21000 * 0.000000001 ETH = 0.000021 ETH.