The one-sentence answer
A satoshi (or “sat”) is the smallest unit of Bitcoin — one hundred millionth of one BTC (0.00000001 BTC). Named after Bitcoin’s pseudonymous creator Satoshi Nakamoto, it is the Bitcoin equivalent of a cent.
1 BTC = 100,000,000 satoshis. At $96,430 per BTC, one satoshi = $0.00096. So 100,000 sats ≈ $96.43.
Why do satoshis exist?
When Bitcoin was created, the price was essentially nothing. The protocol was built to support up to 8 decimal places — meaning you could send as little as 0.00000001 BTC. At a few dollars per coin, this was more than enough precision.
Fast forward to today. At $96,000 per Bitcoin, paying $5 for a coffee requires sending 0.0000519 BTC — an unwieldy number for everyday commerce. Satoshis solve this elegantly: that same $5 coffee is roughly 5,190 sats. Much cleaner.
This is why the Lightning Network — the payment layer used by Square, Strike, and Cash App — uses satoshis as its native unit. Sats are becoming the practical currency of Bitcoin payments.
Every Bitcoin unit, from largest to smallest
| Unit | Symbol | In BTC | At $96,430 |
|---|---|---|---|
| Bitcoin | BTC | 1.00000000 | $96,430 |
| Millibitcoin | mBTC | 0.001 | $96.43 |
| Microbitcoin (bit) | μBTC | 0.000001 | $0.096 |
| Satoshi | sat | 0.00000001 | $0.00096 |
How to convert satoshis to dollars
The math is straightforward. You need two numbers: the amount in sats, and the current BTC price in dollars.
Formula: Sats ÷ 100,000,000 × BTC price = Dollar value
So if you have 250,000 sats and Bitcoin is $96,430: 250,000 ÷ 100,000,000 × $96,430 = $241.08
The BitcoinUnit converter handles this math for you in real time.
When a customer pays you in sats, the IRS considers that taxable income equal to the dollar value at the exact moment of payment. You will need to record the date, sat amount, and dollar value of each transaction.
Will we always use satoshis?
There are 2.1 quadrillion satoshis in existence (21 million BTC × 100 million). With 8 billion people on Earth, there are about 262,500 satoshis per person — a meaningful amount for everyday commerce even at much higher prices.
The current 8-decimal-place precision has significant headroom for Bitcoin’s future growth.