Microbitcoin (uBTC)

Microbitcoin, written μBTC or uBTC, is one of several fractional units built into how Bitcoin amounts are displayed. Since the protocol always tracks balances as whole satoshis under the hood, wallets and exchanges are free to present that same value using metric-style prefixes, and microbitcoin is the millionth-part label on that scale.

One microbitcoin equals exactly 100 satoshis. It sits between the larger millibitcoin (0.001 BTC, or 100,000 satoshis) and the smallest protocol-defined unit, the sat (0.00000001 BTC). Some interfaces use "bit" as an informal, easier-to-say name for the very same amount, a naming push that gained some traction among early Bitcoin advocates as a friendlier alternative to "microbitcoin."

The unit has no independent existence: there is no separate microbitcoin token, address format, or ledger entry. It is purely a formatting choice, similar to quoting a stock price in cents rather than dollars. As one bitcoin's market price rises, quoting amounts in whole BTC increasingly means typing many leading zeros after the decimal point, so smaller denominations like microbitcoin or sats let users and merchants express everyday amounts as more readable whole or near-whole numbers.

Because it is only a display convention, microbitcoin carries none of the risks associated with actual tokens or forks; the underlying coins remain ordinary bitcoin, and no exchange lists "uBTC" as a tradable asset distinct from BTC itself.