Free tool
Crypto Unit Converter
Convert between BTC, mBTC, bits and satoshis, or ETH, Gwei and Wei — plus the fiat value at a price you set.
Crypto amounts get written in whichever denomination is convenient — a BTC price quote, a satoshi transaction fee, a Gwei gas price — and mixing them up is an easy way to misread a number by a factor of a million. Pick BTC or ETH, enter an amount in any one unit, and the rest update instantly, alongside the fiat value at the price you enter.
Enter an amount
Fiat value
Converted
- BTC
- 1
- mBTC
- 1,000
- bits
- 1,000,000
- Satoshis
- 100,000,000
How it works
A crypto unit converter moves an amount between the everyday denominations used for a coin, and between crypto and fiat. Bitcoin is quoted in whole BTC, but transaction fees, small balances and Lightning payments are usually written in satoshis (the smallest unit, one hundred-millionth of a BTC) or millibits. Ethereum is quoted in ETH, but gas prices are set in Gwei and the protocol itself works in wei, the smallest possible unit. Getting these mixed up is one of the easiest ways to misread a balance or a fee by a factor of a thousand or a million. This tool keeps every denomination for the asset you pick in sync as you type, so a satoshi fee, a Gwei gas price and a whole-coin balance can all be read side by side. A second panel adds the fiat side: enter the price you're quoted for one unit of the asset, and it multiplies out to the value of the amount you entered — useful for checking a wallet balance or a quoted transaction cost in your own currency.
Worked example
Say you're checking a Lightning invoice for 50,000 satoshis, and BTC is trading at $65,000. 50,000 sats ÷ 100,000,000 sats/BTC = 0.0005 BTC 0.0005 BTC × $65,000 = $32.50 So that invoice is asking for $32.50 worth of bitcoin. The same logic works in the other direction: enter 0.0005 in the BTC field and the sats, mBTC and bits fields update to match instantly.
This tool performs a straight unit conversion — it does not fetch a live price for you, so the fiat value is only as current as the price you type in. Crypto prices move fast, so re-check the price before relying on the fiat figure for anything time-sensitive, like confirming a payment amount.
Frequently asked questions
How many satoshis are in one Bitcoin?
One Bitcoin equals 100,000,000 satoshis (100 million). A satoshi is the smallest unit Bitcoin can be divided into, named after its pseudonymous creator.
What is a Gwei and how does it relate to ETH?
Gwei is a denomination of Ether used to price gas (transaction fees): 1 ETH equals 1,000,000,000 (one billion) Gwei. Gas prices are quoted in Gwei because whole-ETH amounts would be far too small and awkward to read.
What is wei?
Wei is the smallest possible unit of Ether — 1 ETH equals 1,000,000,000,000,000,000 (one quintillion) wei. Ethereum's protocol and smart contracts work internally in wei; Gwei and ETH are just more readable ways of writing the same amount.
Does this tool show live crypto prices?
No — you enter the price yourself, so the fiat value reflects whatever rate you type in, not a live feed. Check a live price source first if you need an up-to-the-minute figure.
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