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Crypto unit converter

Every network has its own small unit: a bitcoin splits into 100 million satoshi, an ether into 10^18 wei (and into a billion gwei), a TRX into a million sun, a TON into a billion nanotons. An Ethereum fee is the gas price in gwei multiplied by the gas limit, which gives the cost in ETH.

Pick a network and type an amount in any row — the rest are recalculated exactly.

What holds what

NetworkUnitPer coin
Bitcoinsatoshi100 000 000 (10⁸)
Bitcoinbit, also written μBTC1 000 000 (10⁶)
Ethereumwei1 000 000 000 000 000 000 (10¹⁸)
Ethereumgwei1 000 000 000 (10⁹)
TRONsun1 000 000 (10⁶)
TONnanoton1 000 000 000 (10⁹)

Every network stores amounts as a whole number of small units — there is no such thing as a fractional satoshi or wei. That is why a wallet sometimes shows an “uneven” amount: it is not a rounding error but the exact value, written out in the familiar coin.

FAQ

guest@404vpn:~$ cat units-faq.md
[01] $ How many satoshi are in one bitcoin? ▸
> Exactly 100,000,000. A satoshi is the smallest indivisible part of a bitcoin and cannot be split further: every amount in the network is stored as a whole number of satoshi, and the familiar “0.001 BTC” is simply a way of writing it for people.
[02] $ What is gwei and why are fees counted in it? ▸
> A gwei is a billion wei, that is, a billionth of an ether. In wei the gas price would be a number with nine zeros; in ether it would be a zero followed by eight decimal places; in gwei it is a comfortable “30” or “12”. The final fee is the gas price times the limit: an ordinary ether transfer is 21,000 gas.
[03] $ Why do ordinary calculators get big numbers wrong? ▸
> Because they work in floating point, which loses precision past nine quadrillion. An amount in wei easily exceeds that: one ether is 10^18. Here the maths runs on arbitrary-length integers, so the lowest digits never disappear.
[04] $ Do these numbers depend on the exchange rate? ▸
> No, and that matters. Converting satoshi to bitcoin is just a division by a hundred million; it never changes. No dollar or euro rate is involved here: we show no price and fetch nothing from the internet.