🔢 wei / gwei / ether Converter
On-chain amounts really have just one unit — wei. gwei and ether are both multiples of it. Type into any field and the other two convert instantly. Precise big-integer math, runs locally, uploads nothing.
How exactly do wei, gwei and ether relate?
Under the hood, Ethereum (and EVM chains like BNB Chain) keeps its books in a single integer unit called wei — integers are used because computers easily introduce errors with decimals, and money can't be miscounted. But wei is tiny: 1 main coin (ether) equals 10^18 wei, and writing out a long string of digits is unreadable, so there are intermediate units:
- ether: what you normally call "1 ETH" or "0.05 BNB," = 10¹⁸ wei. Transfer amounts usually use it.
- gwei: = 10⁹ wei, = one billionth of an ether. Gas quotes are almost always in gwei, e.g. "gas is 30 gwei right now."
- wei: the smallest unit, an integer, common in the raw data of contracts and block explorers.
For example: a plain transfer uses 21,000 gas at a gas price of 30 gwei, so the fee = 21,000 × 30 = 630,000 gwei = 0.00063 ether. Paste these numbers into the three fields above and you can see exactly how they convert. To turn a gas cost directly into money, use the Gas Fee Cost Calculator; to understand gas from the ground up, read what a gas fee is, how to read it, and how to save on it.
For the unit definitions see the official Ethereum docs (Intro to Ether).
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