Under the bonnet, Bitcoin does not deal in decimals. Balances and transfers are recorded as integer counts of satoshis — 100,000,000 of them to one bitcoin — which keeps the arithmetic exact and avoids the rounding errors that floating-point numbers invite. When your wallet shows a balance with eight decimal places, it is formatting satoshis for human eyes.
That divisibility is the practical point. Nobody needs to acquire a whole coin to use the network, and small amounts are perfectly ordinary. You will meet sats most often in fee estimates, which are quoted as satoshis per unit of transaction size rather than in bitcoin — our walkthrough on <a href="/toolkit/how-to-estimate-a-network-fee/">estimating a network fee</a> shows how that maths lands on a real transfer. Payment layers built on top of Bitcoin also work naturally in sats.
The unit is named after the pseudonym attached to the Bitcoin whitepaper and to the <a href="/glossary/genesis-block/">genesis block</a>. Who was behind that name has never been established, and we will not speculate about it; the unit is a naming convention and nothing more.
One confusion worth clearing up: counting in sats does not make bitcoin cheap, and comparing coins by their per-unit price tells you nothing useful. The number of units a project issues is a design choice, so a low price per unit reflects how the supply was carved up rather than how large or small the network is. Compare total supply and the full picture instead — you can check live conversions on our <a href="/convert/">converter</a>.
Key takeaways
- Bitcoin's ledger stores whole numbers of satoshis, so the eight decimal places you see are a display convention rather than the underlying format.
- Fee rates are quoted in sats per unit of transaction size, which is why a fee depends on how big your transaction is, not on how much value you are sending.
- Per-unit price says nothing about one coin's size relative to another, because unit counts are arbitrary design decisions.
Satoshi — frequently asked questions
How many satoshis are in one bitcoin?
One hundred million. The protocol has recorded amounts in these units from the start, so a bitcoin is really a label for 100,000,000 satoshis rather than the other way round. Many wallets let you switch the display between BTC and sats, which some people find easier for small everyday amounts because it avoids long strings of leading zeros.
Can bitcoin be divided into anything smaller than a satoshi?
Not on the base chain as it stands — the satoshi is the smallest amount the ledger records. Some payment layers built on top of Bitcoin track balances with extra precision internally, but whatever eventually settles back to the chain is a whole number of satoshis. Any finer division on-chain would require a change to the protocol itself.
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