Wei, Gwei and ETH Converter
Ethereum records every value in wei. Gas prices are quoted in gwei, and balances are shown in ether. Type into any field below and the other two follow — fixed ratios, no market data.
The three units
| Unit | In wei | Typically used for |
|---|---|---|
| wei | 1 | The unit the protocol actually stores |
| gwei | 1,000,000,000 | Gas prices, base fees, priority fees |
| ether | 1,000,000,000,000,000,000 | Balances, transfers, displayed totals |
Where this matters
Fee arithmetic mixes units constantly: a gas limit is a count of units, a base fee is a price in gwei, and the resulting cost is usually shown in ether. Misreading gwei as ether is one of the most common sources of confusion when people first look at a transaction on a block explorer.
Frequently Asked Questions
How many wei are in one ether?
Exactly 1,000,000,000,000,000,000 wei — ten to the power of eighteen. One gwei is one billion wei, so one ether is one billion gwei.
Why are gas prices quoted in gwei?
Wei is too small to read comfortably and ether is too large for a fee. Gwei sits in between, so a base fee reads as a number like 20 rather than 20,000,000,000 wei.
Does this converter need price data?
No. Wei, gwei and ether are three units of the same asset, so the conversion is a fixed ratio. Nothing you type is sent anywhere.
Why does a very large wei value lose precision?
Browsers hold ordinary numbers with limited precision. For exact accounting at wei scale, tooling uses big-integer types; this converter is built for reading and sanity-checking values, not for settlement.
Read Ethereum gas explained, estimate a cost with the transaction fee estimator or browse all calculators.