A satoshi is the smallest unit of Bitcoin. One bitcoin = 100,000,000 satoshis. Here is everything you need to know about the building block of Bitcoin.
A satoshi (abbreviated "sat") is the smallest unit of Bitcoin. One bitcoin equals 100,000,000 satoshis. Just as one dollar equals 100 cents, one bitcoin equals 100 million satoshis.
The unit is named after Satoshi Nakamoto, Bitcoin's anonymous creator.
When Bitcoin was created in 2009, one bitcoin was worth fractions of a cent. Satoshi Nakamoto built divisibility directly into the protocol — Bitcoin can be divided into 100 million units — so that Bitcoin could scale in price without becoming impractical for everyday transactions.
At $1 per bitcoin, one satoshi = $0.000001 (one-millionth of a dollar). At $90,000 per bitcoin, one satoshi = $0.0009 (about one-tenth of a cent).
As Bitcoin's price rises, denominating transactions in satoshis instead of full BTC becomes more intuitive. Saying "send me 10,000 sats" is cleaner than "send me 0.00010000 BTC."
| Amount in BTC | Amount in Satoshis | Value at $90,000/BTC |
|---|---|---|
| 1 BTC | 100,000,000 sats | $90,000 |
| 0.1 BTC | 10,000,000 sats | $9,000 |
| 0.01 BTC | 1,000,000 sats | $900 |
| 0.001 BTC | 100,000 sats | $90 |
| 0.0001 BTC | 10,000 sats | $9 |
| 0.00001 BTC | 1,000 sats | $0.90 |
| 0.000001 BTC | 100 sats | $0.09 |
| 0.00000001 BTC | 1 sat | $0.0009 |
Here are the satoshi amounts you will encounter most often:
1 sat — The minimum unit. Used for tiny Lightning payments, tips, and fee calculations.
1,000 sats (1 kilosat) — About $0.90 at $90K/BTC. Common for small Lightning payments — a coffee-sized tip or micro-transaction.
10,000 sats — About $9. A common denomination for Bitcoin ATM minimums and small purchases.
100,000 sats — About $90. Sometimes called "1 bit" in older usage. Common threshold for moving Bitcoin off an exchange.
1,000,000 sats (1 millibitcoin / mBTC) — About $900. One-hundredth of a bitcoin.
21,000,000 sats — About $18,900 at $90K. A notable round number — the total Bitcoin supply is 21 million BTC = 2,100,000,000,000,000 (2.1 quadrillion) satoshis.
The Lightning Network uses a unit even smaller than satoshis: millisatoshis (msats). One satoshi equals 1,000 millisatoshis.
Millisatoshis exist because Lightning Network routing fees are so small that the sat is too large to express them precisely. In practice, most users never see millisatoshis directly — wallets display totals in satoshis or BTC.
When you pay a Lightning invoice for 50 sats, the actual routing fee might be 1-5 satoshis depending on the route. Apps like Phoenix Wallet, Wallet of Satoshi, and Breez handle this automatically.
"Stacking sats" is the Bitcoin community's phrase for regularly accumulating Bitcoin, regardless of price. Instead of trying to buy whole bitcoins (increasingly expensive), investors buy in satoshi-denominated amounts — $10, $50, or $100 of sats per week.
At $90,000/BTC:
Dollar-cost averaging (DCA) into satoshis is the standard strategy for long-term Bitcoin investors. Platforms like River, Swan Bitcoin, and Cash App make automated sat-stacking easy.
As Bitcoin's price rises, the denomination debate intensifies. Proponents of "the Bitcoin standard" argue we should price everything in satoshis eventually — just as we price everything in cents today rather than in fractions of a dollar.
Some apps already default to satoshi display:
The Bitcoin protocol itself is agnostic — it stores all values internally in satoshis (integers), converting to BTC display only in user interfaces.
Bitcoin's hard cap of 21 million BTC translates to:
2,100,000,000,000,000 satoshis — 2.1 quadrillion
With approximately 8 billion people on Earth, that is about 262,500 satoshis per person if distributed evenly. At today's prices, that is roughly $236 worth per person. This scarcity is a core part of Bitcoin's value proposition.
| Cryptocurrency | Smallest Unit | Divisibility |
|---|---|---|
| Bitcoin (BTC) | 1 satoshi = 0.00000001 BTC | 8 decimal places |
| Ethereum (ETH) | 1 wei = 0.000000000000000001 ETH | 18 decimal places |
| Litecoin (LTC) | 1 litoshi = 0.00000001 LTC | 8 decimal places |
Bitcoin's 8 decimal places (100 million sats per BTC) are fixed in the protocol. The Lightning Network adds 3 more decimal places via millisatoshis (msats) for routing, but these never settle on-chain.
The Bitcoin protocol supports exactly 8 decimal places — 100 million satoshis per BTC. This is fixed in the consensus rules.
Could it ever be changed? In theory, yes — with a soft fork that the entire network agreed to. In practice, Bitcoin's community is extremely conservative about changing consensus rules. With 2.1 quadrillion satoshis already available, further subdivision is not expected to be necessary for hundreds of years.
If Bitcoin's price ever reached $10 million per coin, one sat would be worth $0.10 — still a usable unit. At $1 billion per coin, one sat = $0.01, essentially one cent. The protocol has room to grow.
How many satoshis are in a bitcoin? Exactly 100,000,000 (one hundred million) satoshis per bitcoin.
What is the value of one satoshi? At $90,000 per bitcoin, one satoshi is worth $0.0009 — less than one-tenth of one cent. The value scales directly with bitcoin's price.
Can I buy less than one satoshi? No. One satoshi is the minimum on-chain unit. Lightning Network routing uses millisatoshis (0.001 sat) internally, but you cannot receive or send fractions of a satoshi in a final settlement.
Who is a satoshi named after? Satoshi Nakamoto, the anonymous individual or group who created Bitcoin and published the Bitcoin whitepaper in 2008. Nakamoto's identity remains unknown.
How do I see my Bitcoin balance in satoshis? Most wallets let you toggle between BTC and satoshi display. On BlueWallet, go to Settings → Display → Satoshis. On Sparrow Wallet, it displays sats natively in many views.
What is "stacking sats"? Stacking sats means regularly buying small amounts of Bitcoin (measured in satoshis), typically through dollar-cost averaging. It is the most common long-term Bitcoin accumulation strategy.
A satoshi is to Bitcoin what a cent is to a dollar — just much smaller. With 100 million satoshis in every bitcoin, the denomination is designed to keep Bitcoin usable as prices rise. "Stacking sats" is the ethos of the long-term Bitcoin holder: buy consistently, measure in satoshis, and think in decades.
Start stacking at River or Cash App, secure your sats with a hardware wallet, and read how much Bitcoin to own to right-size your position.
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