The unit relationships
Multiply BTC by 100 million to express the same amount in satoshis. Multiply BTC by 1,000 to express it in mBTC. One mBTC equals 100,000 satoshis.
For example, 0.001 BTC is 1 mBTC and 100,000 satoshis. These are three names for the same amount, not three different assets. Their relationship does not change with the bitcoin market price.
Decimals and transaction precision
A satoshi is the ordinary on-chain unit used for bitcoin amounts. This converter accepts amounts that resolve to whole satoshis and rejects fractional-satoshi inputs. That boundary helps avoid displaying a value that cannot be represented as a standard on-chain amount. Final transaction validation still belongs in the wallet or payment system.
This browser calculator uses ordinary numeric arithmetic and displays suitable decimal precision. For programmatic accounting, represent on-chain satoshi amounts as integers and validate the conversion boundary rather than relying on rounded display text.
Conversion is not a fee estimate
An amount expressed in satoshis does not say how many virtual bytes a transaction uses. To estimate a network fee, combine virtual size with a rate in sat/vB using the fee calculator. This converter intentionally does not require a BTC/USD quote, so it remains usable without a data provider.
Questions about this tool
Does the conversion need a live BTC price?
No. These are fixed bitcoin denomination relationships. A fiat conversion would require a separate price assumption.
Are mBTC and sats different cryptocurrencies?
No. They are units used to display bitcoin amounts.