BTC ↔ Satoshis Converter

One bitcoin holds a hundred million satoshis, and it is exactly that pile of zeros that makes someone pay a fee ten times larger than intended. The wallet shows sats, the exchange shows BTC, and the statement mixes both. Type a value into either field and the other updates immediately, with no button to press, so you can check the number before confirming a transaction.

The conversion is pure definition, not a quote: one BTC equals a hundred million sats, a ratio fixed in the protocol from the start. The result therefore does not depend on price, currency or time of day. The satoshi field is rounded to a whole number, since a satoshi is the smallest unit and no fraction of it exists; the BTC field shows eight decimal places, which is all the precision the network recognises.

In practice that means typing more than eight decimals in BTC raises no error, it simply rounds to the nearest satoshi. The tool is handy for reading network fees, almost always quoted in sats per virtual byte, and for double-checking withdrawal amounts before pasting them into a form. Nothing is transmitted anywhere: the arithmetic happens in your browser, and the page has no idea which wallet you use.