How many satoshis are in one bitcoin?

There are 100,000,000 satoshis in one bitcoin.

A satoshi, commonly abbreviated “sat,” is Bitcoin’s smallest standard unit. The name honors Satoshi Nakamoto, the pseudonymous creator or creators of Bitcoin. Because Bitcoin is divisible to eight decimal places, 0.00000001 BTC equals exactly one satoshi.

This denomination makes small payments and precise accounting possible without using long decimal fractions. Fees, for example, are often quoted in satoshis per virtual byte, and wallets may display balances in either BTC or satoshis depending on the transaction’s size.

A frequent mix-up is confusing satoshis with millibitcoins. One millibitcoin, or mBTC, equals 0.001 BTC, which is 100,000 satoshis—not 1,000,000. Bitcoin’s eight-decimal precision is a protocol convention, and the smallest spendable amount is generally one satoshi, although fees and transaction rules determine what amounts are practical to send.