What Is a Satoshi? Bitcoin Units Explained

If you have ever looked at a Bitcoin wallet and seen a long string of zeros, you have met the satoshi. It is the smallest unit of Bitcoin, and understanding it makes prices, fees, and tiny payments far easier to read. Want to skip the theory? Jump straight to our BTC to Satoshi Converter.

The Short Answer

1 BTC = 100,000,000 satoshis. One satoshi (often shortened to "sat") is therefore 0.00000001 BTC — Bitcoin is divisible to eight decimal places, and the satoshi is that eighth decimal. Just as a dollar is made of 100 cents, a bitcoin is made of one hundred million sats.

Where the Name Comes From

The unit honors Satoshi Nakamoto, the pseudonymous person or group who published the Bitcoin white paper in 2008 and released the first software in 2009. The name was adopted organically by the community and is now used by virtually every wallet, exchange, and block explorer.

Common Bitcoin Denominations

Unit	Value in BTC	Value in Satoshis
1 BTC	1	100,000,000
1 mBTC (milli)	0.001	100,000
1 bit / μBTC (micro)	0.000001	100
1 satoshi	0.00000001	1

Why Satoshis Matter

Readability: Saying "5,000 sats" is friendlier than "0.00005 BTC" for small amounts like tips and micropayments.
Fees: Bitcoin transaction fees are quoted in sats per vByte, so estimating a fee means thinking in satoshis, not whole bitcoin.
Lightning Network: Fast, low-value Lightning payments are almost always denominated in sats.
Accumulation mindset: "Stacking sats" lets people buy fractions of Bitcoin without needing to afford a whole coin.

How to Convert BTC to Satoshis

The math is simple: multiply your BTC amount by 100,000,000. For example, 0.0025 BTC = 250,000 sats. Going the other way, divide your sats by 100,000,000 to get BTC. Because it is easy to miscount the zeros, the safest approach is to use a calculator that also shows the live fiat value.

Try our BTC to Satoshi Converter for instant, accurate results with the current USD price — or explore unit conversions for other coins like ETH to Wei and SOL to Lamports.

Frequently Asked Questions

How many satoshis are in one Bitcoin?

Exactly 100,000,000 satoshis make up 1 BTC. The satoshi is the smallest unit the Bitcoin protocol can record, so one satoshi is 0.00000001 BTC — eight decimal places.

Why is the smallest Bitcoin unit called a satoshi?

It is named after Satoshi Nakamoto, the pseudonymous creator of Bitcoin. The unit was popularized by the community and is now standard across wallets, exchanges, and the Lightning Network.

What is a satoshi worth in dollars?

Divide the current BTC price by 100,000,000. At a price of $60,000 per BTC, one satoshi is about $0.0006. Because the value is so small, amounts are usually shown in thousands of sats.

Are there units smaller than a satoshi?

On the Bitcoin base layer, no — the satoshi is the smallest recordable unit. On the Lightning Network, payments can be measured in millisatoshis (1 sat = 1,000 msat) for routing, but these are not settled on-chain.