Gwei

What Is Gwei?

Specifically, one unit of gwei is defined as one-billionth (one nano) of an ether. So 1 gwei equals 0.000000001 or 10e-9 ETH. Conversely, 1 ETH equals one billion (10e9) gwei. This relationship makes gwei a practical unit for expressing small amounts of ether that would otherwise require many decimal places when written in ETH directly.

How Gwei Is Used

To understand why gwei is practical, consider an analogy with the US dollar. Gwei functions like coins (cents) while ETH functions like dollar bills. For small transactions, it’s easier to refer to prices in gwei rather than in fractions of ETH. This makes gwei especially handy when measuring small values, which is why it is widely used when calculating gas prices.

Although less common, gwei may sometimes be referred to as Shannon, NanoEther, or Nano. The term Shannon refers to the mathematician and cryptographer Claude Shannon, who is known as the father of information theory. These alternative names are rarely used in practice, but they may appear in technical documentation or older discussions about Ethereum gas pricing.

Gwei and Ethereum Denominations