BROWSER-ONLY TOOL
Gwei to ETH converter: wei, gwei and ether units
Enter a value in any denomination and every other one updates as you type. The conversion runs on exact integer arithmetic, so an eighteen-decimal balance does not lose digits the way a floating-point calculator does.
The denominations, and where you meet them
| Unit | Wei | Where you see it |
|---|---|---|
| wei | 1 | The smallest unit. Raw contract and receipt values are usually quoted here. |
| kwei (babbage) | 1000 | Rarely used outside protocol documentation. |
| mwei (lovelace) | 1000000 | Rarely used outside protocol documentation. |
| gwei (shannon) | 1000000000 | The unit gas prices are quoted in. |
| szabo (microether) | 1000000000000 | Legacy denomination, occasionally seen in older tooling. |
| finney (milliether) | 1000000000000000 | Legacy denomination, occasionally seen in older tooling. |
| ether | 1000000000000000000 | The unit wallets display as ETH, and the unit exchanges quote. |
Why exact arithmetic matters here
A JavaScript number holds about fifteen significant digits reliably. An ether value has eighteen decimal places, so a balance of a few ether expressed in wei already exceeds what a floating-point calculator can represent without silently altering the last digits.
That is why this page converts through whole-number arithmetic instead. Enter 123456789.123456789 ether and the wei value keeps every digit. A converter built on ordinary numbers will round the tail, which matters when you are reconciling an exact on-chain amount.
This converter changes denominations of the same asset. It does not convert between currencies, fetch a price or estimate a fee.
Sources & further reading
- Ethereum: intro to ether
Wei as the smallest unit and the named denominations above it.
- Ethereum: gas and fees
Gas prices are quoted in gwei, which is one billionth of an ether.
- Ethereum: transactions
Transaction value and fee fields are carried in wei.
Sources checked on 18 September 2026. Network features and platform support can change; check the relevant provider before acting.