Wei to Gwei to Ether Converter
Convert between every Ethereum and Monad denomination — wei, gwei, and ether — with exact, big-integer precision.
Wei is the smallest unit of ETH or MON; 1 ether = 1,000,000,000 gwei = 10^18 wei. This converter takes a value in any unit and shows it in all the others instantly, using big-integer math so there is no rounding error — the same denominations Monad uses because it is EVM-compatible.
Ether (and Monad's MON) has no decimal type on-chain. The EVM only knows integers, so every amount is stored in wei — the smallest indivisible unit. One ether is exactly 10^18 wei, and one gwei ("giga-wei") is 10^9 wei. Gas prices are quoted in gwei because it is a convenient scale for fees, while smart-contract code deals in wei almost exclusively.
Converting by multiplying or dividing with JavaScript numbers breaks for large values, because numbers above 2^53 lose precision. This tool parses your input into a wei BigInt and formats back out, so a value like 123456789012345678 wei round-trips perfectly to ether and back.
Because Monad is EVM-compatible, MON uses the identical denomination ladder: 1 MON = 10^18 wei, fees are quoted in gwei, and the same converter applies when you deploy or interact with a token on Monad.
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