Convert crypto units instantly: BTC to satoshis, ETH to gwei and wei, with exact big-number math and every unit shown at the same time.
All conversions happen locally in your browser. Nothing leaves your device.
——Crypto units are not different currencies — they are just different-sized slices of the same coin. A Bitcoin is worth 100,000,000 satoshis, an ETH is worth 1,000,000,000 gwei and, in turn, 1,000,000,000,000,000,000 wei. Converting between them is therefore nothing more than sliding the decimal point by a fixed number of places. That is exactly what this tool does, and it does it without ever losing precision.
A satoshi (often written 'sat') is the smallest unit of Bitcoin. One BTC is divided into 100,000,000 satoshis, so 1 sat is 0.00000001 BTC. People use sats because whole numbers are easier to read than long decimals — for example, 0.0001 BTC is exactly 10,000 sats.
Gwei is a common unit for Ethereum gas prices and transaction fees. One ETH is divided into 1,000,000,000 gwei, so 1 gwei equals 0.000000001 ETH. Gas fees are usually quoted in gwei, which is why converting gwei back to ETH is so useful for understanding what a transaction really costs.
Exactly. Every conversion here is a multiplication or division by a power of ten (10^8, 10^9 or 10^18), which is done with arbitrary-precision string math instead of floating point. That means 0.0001 BTC always shows as exactly 10,000 sats and 1 gwei always shows as exactly 0.000000001 ETH, with no rounding error.
One ETH equals 1,000,000,000,000,000,000 wei (10^18). Wei is the smallest unit of Ether, the same way a satoshi is for Bitcoin. Because wei numbers get very large, this tool converts them without losing any precision.
No. Everything runs locally in your browser. The value you type and every conversion are computed on your device with no network requests, no storage and no tracking, so nothing ever leaves your browser.
If you just finished with Crypto Unit Converter, the natural next steps are Bitcoin Halving Countdown, Multi-Currency Converter, Crypto P&L Calculator, or browse every tool in Crypto Tools.