Satoshi
Quick Definition
A satoshi (often shortened to 'sat') is the smallest unit of Bitcoin, named after Bitcoin's creator Satoshi Nakamoto. One Bitcoin equals one hundred million satoshis. This fine divisibility means you can own and spend a tiny fraction of a Bitcoin, so the high price of a whole coin never prevents anyone from using or holding Bitcoin.
Key Takeaways
- One Bitcoin equals 100,000,000 satoshis.
- Satoshis make Bitcoin highly divisible, so you can own a fraction of a coin.
- The unit is named after Bitcoin's pseudonymous creator, Satoshi Nakamoto.
- Lightning Network payments and stacking apps often use satoshis for small amounts.
How It Works
Bitcoin's protocol is denominated in the smallest unit, the satoshi, internally. When a wallet shows you '0.001 BTC,' it is really displaying 100,000 satoshis in a friendlier format. Because each Bitcoin can be split into 100 million satoshis, Bitcoin is far more divisible than traditional currencies, which typically divide into only 100 cents per unit.
Why It Matters
Divisibility is essential for a useful currency. If Bitcoin could only be transacted in whole coins, its high price would make everyday spending impossible. Satoshis solve this: you can send a few hundred sats as a tip, pay for coffee with thousands, or stack fractions over time. The satoshi also enables micropayments on the Lightning Network, where fees can be a fraction of a single sat.
A Simple Example
You want to buy something that costs $5 when one Bitcoin is $50,000. You do not need a whole coin—you spend 0.0001 BTC, which is 10,000 satoshis. The wallet may show it as 0.0001 BTC, but under the hood the network records 10,000 satoshis.
Common Misconception
A common fear is that because one Bitcoin is expensive, you cannot afford to use Bitcoin at all. In reality you can buy, send, and hold any fraction of a Bitcoin down to a single satoshi. You never need to own a whole Bitcoin to participate.
Frequently Asked Questions
How many satoshis are in one Bitcoin?
Exactly 100,000,000 satoshis equal one Bitcoin. This fixed relationship is built into Bitcoin's protocol and never changes.
Can I buy less than one Bitcoin?
Yes. You can buy, send, and hold any fraction of a Bitcoin down to a single satoshi. Exchanges and wallets let you purchase small amounts, so you never need a whole coin to start.
Is a satoshi worth anything?
Each satoshi has a small value that changes with Bitcoin's price. Because satoshis are tiny, their individual dollar value is fractions of a cent, but they add up across whole coins and large balances.
Why are people talking about 'stacking sats'?
'Stacking sats' means regularly buying or earning small amounts of Bitcoin over time. It is a popular approach to gradually accumulate Bitcoin without trying to time the market for a large purchase.
Related Terms
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Sources & Further Reading
Last reviewed: 2026-09-05 · Published by Bitcoin Ink Editorial Team