A satoshi is the smallest unit of bitcoin. One bitcoin divides into exactly 100,000,000 satoshis, making satoshis the base denomination for every Bitcoin transaction, balance, and fee. Understanding them is necessary for reading on-chain outputs, Lightning Network payments, and bitcoin amounts in practical terms.
Try the satoshi converter to convert sats to BTC and USD.
How many satoshis are in a bitcoin?
One bitcoin divides into exactly 100,000,000 satoshis — one hundred million. Written as a decimal, 1 satoshi equals 0.00000001 BTC. The Bitcoin protocol defines and fixes eight decimal places across all bitcoin denominations, a convention formally codified by BIP 172 in May 2025.
| Amount | BTC equivalent |
|---|---|
| 1 sat | 0.00000001 BTC |
| 1,000 sats | 0.00001000 BTC |
| 1,000,000 sats | 0.01000000 BTC |
| 100,000,000 sats | 1.00000000 BTC |
The Bitcoin protocol enforces the satoshi as an indivisible unit. No on-chain transaction can move a fraction of a satoshi. Every balance and every fee is a whole-number count of satoshis, even when wallets display values in BTC or local currency.
A subset of wallets adopted integer-only satoshi display under BIP-177 by early 2026, replacing BTC decimal notation with whole-number satoshi counts.
How much is one satoshi worth?
The calculation is direct: divide the current bitcoin price by 100,000,000. If bitcoin trades at $100,000, one satoshi is worth $0.001, or one-tenth of a cent.
The satoshi’s dollar value moves in lockstep with the Bitcoin price. A 10% rise in BTC raises the value of every satoshi by the same proportion. A 10% drop reduces it by the same amount. There is no peg and no floor.
In practice, satoshis are the standard unit for on-chain fees and Lightning Network payments. Quoting fees in sats keeps the numbers readable. A fee of 50 sats is easier to parse than 0.00000050 BTC.
Where does the name “satoshi” come from?
The name honors Satoshi Nakamoto, the pseudonymous creator of Bitcoin. On February 10, 2011, BitcoinTalk user ribuck proposed naming the smallest unit “satoshi” after Nakamoto. The Bitcoin community adopted the term, and by 2011 “satoshi” had become the standard denomination for the protocol’s base unit.
The satoshi has a widely accepted name but no universally adopted symbol. Multiple Unicode character proposals have circulated over the years, including stylized lowercase “s” variants with horizontal strokes. The Bitcoin Design Community proposed a satoshi symbol based on Unicode U+2250, chosen to reference Bitcoin’s fixed 21 million supply, with plans to seek Unicode Consortium approval; no submission resulted. None has reached consensus across the Bitcoin ecosystem.
In practice, “sat” (singular) and “sats” (plural) are the standard shorthands used across wallets, exchanges, and Lightning apps. Informally, the lightning bolt has become a visual shorthand for satoshis across wallets and apps, reflecting the Lightning Network’s role as the primary settlement layer for satoshi-denominated payments.
What are satoshis used for?
Satoshis serve several functions and use cases:
- Unit of account — every on-chain balance, transaction output, and fee is denominated in satoshis at the protocol level, even when wallet interfaces display BTC
- Microtransactions — satoshis enable small-value transfers that are impractical to express in BTC decimal notation and unworkable in fiat payment systems, where minimum transaction sizes and processing costs make sub-cent transfers economically unfeasible
- Lightning Network payments — the Lightning Network, Bitcoin’s Layer 2 payment protocol, routes payments in satoshis; the smallest viable Lightning invoice is 1 satoshi, and payments settle near-instantly. River Financial data from November 2025 measured $1.17 billion in monthly volume across 5.22 million transactions, all denominated in satoshis
Beyond these protocol-level functions, satoshis’ sub-cent precision is enabling use cases not workable in fiat.
- Gaming environments are issuing satoshis as in-game rewards.
- Andy Schroder’s Distributed Charge project prototyped electric vehicle charging priced per kilowatt, paid in satoshis automatically.
- Emerging models point toward streaming micropayments and fractional revenue distribution, splitting a payment across multiple contributors in real time.
Convert satoshis with the Orange Abacus calculator
The satoshi converter converts between sats, BTC, and USD using the live bitcoin price. Enter any value and the calculator updates the other two fields automatically.