One bitcoin equals 100 million satoshis
A satoshi is the smallest unit of bitcoin. One bitcoin is divisible into exactly 100,000,000 satoshis, often abbreviated as "sats". This means one satoshi equals 0.00000001 bitcoin. The satoshi was named after Satoshi Nakamoto, the pseudonymous creator of bitcoin.
Think of satoshis the way you think of cents in a dollar — except bitcoin uses 100 million divisions instead of 100. Just as you can't spend less than one cent in U.S. currency, you can't transact in bitcoin smaller than one satoshi on the main blockchain. This smallest unit is built into bitcoin's code and cannot be changed.
Because bitcoin's price has risen over time, satoshis have become a practical way to talk about small amounts. When bitcoin costs tens of thousands of dollars per coin, saying "I received 0.00050000 bitcoin" is awkward. Saying "I received 50,000 sats" is clearer and more natural in conversation.
Key Takeaways
- One bitcoin contains exactly 100 million satoshis, and this division is permanent in bitcoin's code.
- One satoshi equals 0.00000001 bitcoin and is the smallest unit you can send or receive on the bitcoin network.
- Satoshis are named after Satoshi Nakamoto, bitcoin's creator, and are commonly abbreviated as "sats".
- Using satoshis instead of decimal bitcoin amounts makes it easier to discuss and track small transactions without dealing with many zeros.
Why bitcoin is divided into satoshis
Bitcoin's creator designed the network to handle 100 million satoshis per bitcoin from the start. This wasn't arbitrary — it was chosen to allow for future growth and flexibility. If bitcoin's value increased dramatically, users would still be able to make small transactions without needing to use fractions of a satoshi.
The division also serves a practical purpose in how the network records transactions. Bitcoin's ledger tracks amounts in satoshis, not in whole bitcoins. When you send bitcoin, the network calculates the transfer in satoshis behind the scenes, then displays it to you in whatever unit you prefer — satoshis, bitcoin, or even your local currency.
How satoshis compare to other bitcoin units
Bitcoin has several named units, though satoshis and whole bitcoins are by far the most common in everyday use. A millibitcoin (mBTC) equals 0.001 bitcoin, or 100,000 satoshis. A microbitcoin (μBTC) equals 0.000001 bitcoin, or 100 satoshis. These middle units exist mainly for historical reasons and are rarely used in modern bitcoin wallets or exchanges.
Most wallets and exchanges let you choose which unit to display. You might see your balance shown as 0.5 BTC, 500 mBTC, or 50,000,000 sats — they all represent the same amount. The choice is purely about what's easiest to read and discuss.
When you might see satoshi amounts in practice
If you receive bitcoin payments or earn sats through work or rewards, you'll often see amounts stated in satoshis. A payment of 5,000 sats is much easier to say and remember than 0.00005 bitcoin. Online communities and bitcoin-focused platforms commonly use sats as the default unit, especially for smaller amounts.
Transaction fees on the bitcoin network are also quoted in satoshis per byte of data (sat/vB). When you send bitcoin, your wallet shows you the fee in sats, and you can choose to pay more sats for faster confirmation or fewer sats if you're willing to wait longer. Understanding satoshis helps you make sense of these fee options.
The fixed supply and satoshi scarcity
Bitcoin has a hard cap of 21 million coins, which means there will never be more than 2.1 quadrillion satoshis in existence. This fixed supply is one of bitcoin's core features — no central bank can print more. Once all 21 million bitcoins are mined (expected around the year 2140), no new satoshis will be created.
Because the total supply is fixed and known, satoshis have a property called scarcity. There are only so many to go around, and the number never increases. This is different from traditional currencies, where central banks can create more money whenever they choose.
Converting between satoshis and bitcoin
Converting between satoshis and bitcoin is straightforward math. To convert satoshis to bitcoin, divide by 100 million. To convert bitcoin to satoshis, multiply by 100 million. Most wallets and exchanges do this conversion automatically and let you view your balance in whichever unit you prefer.
If you're doing the math by hand, remember that each zero matters. One bitcoin is 1.00000000 BTC, which equals 100,000,000 sats. Half a bitcoin is 0.50000000 BTC, which equals 50,000,000 sats. A thousandth of a bitcoin is 0.00100000 BTC, which equals 100,000 sats.
Frequently Asked Questions
Can satoshis be divided into smaller units?
No. One satoshi is the smallest unit of bitcoin that can be sent on the main blockchain. The bitcoin code treats satoshis as indivisible. However, some payment systems built on top of bitcoin (called layer-two networks) can theoretically handle smaller divisions, but these are not part of the core bitcoin network.
Will the number of satoshis per bitcoin ever change?
No. The 100 million satoshis per bitcoin is hardcoded into bitcoin's protocol and cannot be changed. Changing it would require altering the fundamental rules of the network, which would require agreement from the vast majority of the bitcoin network's participants — something that has never happened for a core rule.
Why is it called a satoshi?
The unit is named after Satoshi Nakamoto, the person or group who created bitcoin and published the original bitcoin whitepaper in 2008. The name was chosen by the bitcoin community as a way to honor the creator. Satoshi Nakamoto's true identity remains unknown.
Do I need to understand satoshis to use bitcoin?
No. Your wallet will display your balance in whatever unit you find easiest — satoshis, whole bitcoins, or your local currency. You don't need to do any math or conversions yourself. Understanding satoshis is helpful for reading bitcoin discussions and understanding how fees work, but it's not required to send or receive bitcoin.