What is a satoshi, how much is 1 sat worth, and why Bitcoin's smallest unit changes the way you think about buying Bitcoin.
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"Bitcoin costs $80,000. I can't afford that."
This is the single most common misconception about Bitcoin. You do not need to buy a whole one. Just like you do not buy a full ounce of gold to own gold, you can buy any fraction of a bitcoin.
The smallest unit of Bitcoin is the satoshi (sat), named after its creator Satoshi Nakamoto.
1 BTC = 100,000,000 satoshis (100 million sats)
If Bitcoin is $80,000:
You can buy Bitcoin for the price of a coffee. A $5 purchase gets you roughly 6,250 satoshis.
"Bitcoin is too expensive" is like saying "gold is too expensive because a kilogram costs $80,000." Nobody buys gold by the kilogram. Nobody needs to buy Bitcoin by the whole coin.
| Unit | BTC | Satoshis | Common Name |
|---|---|---|---|
| 1 BTC | 1 | 100,000,000 | Bitcoin |
| 0.001 BTC | 0.001 | 100,000 | millibit (mBTC) |
| 0.00000001 BTC | 0.00000001 | 1 | satoshi (sat) |
The Bitcoin community increasingly uses sats as the default unit. "35,000 sats" is more intuitive than "0.00035 BTC." Many wallets and exchanges now offer a sat-denominated display.
"Stacking sats" is Bitcoin culture for buying small amounts regularly instead of waiting to afford a whole coin.
$5 per day at $80,000/BTC:
This is DCA (Dollar Cost Averaging) in practice. Buy consistently regardless of price, and your average cost smooths out over time.
On the Lightning Network, units get even smaller:
1 satoshi = 1,000 millisatoshis (msat)
Millisatoshis cannot be used on-chain but are valid within Lightning channels. This enables sub-cent micropayments:
In 2026, at stores accepting Lightning:
Bitrefill (gift cards), Fold (cashback), and Nostr (social tipping) are all satoshi-native.
Psychology. "I own 0.0003 BTC" feels like nothing. "I own 30,000 sats" feels like something meaningful. Same amount, different perception.
This is not trivial. The number one barrier for new investors is "Bitcoin is too expensive." Thinking in sats removes that barrier entirely.
Bitcoin has a cap of 21 million coins. In satoshis, that is 2.1 quadrillion sats - enough to give every person on Earth 262,500 sats.
Bitcoin is not expensive. You are just using the wrong unit.