Convert between Bitcoin units (BTC, mBTC, Satoshi) and Ethereum units (ETH, Gwei, Wei) instantly. Exact integer arithmetic for Wei. No signup required.
Added May 3, 2026
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Enter a value for amount to see your result.
Convert between Bitcoin units (BTC, mBTC, Satoshi) and Ethereum units (ETH, Gwei, Wei). Handles the full precision of Wei using exact integer arithmetic.
One bitcoin equals exactly 100 million satoshi.
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One ether equals 1 billion Gwei.
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Exactly 100,000,000 satoshi (one hundred million). Satoshi is the smallest indivisible unit of Bitcoin.
Exactly 1,000,000,000,000,000,000 Wei (10^18, or one quintillion). Wei is the smallest unit of Ether, named after Wei Dai.
Gwei (gigawei = 10^9 Wei) is the standard unit for expressing Ethereum gas prices. A gas price of '20 Gwei' means 20 × 10^9 = 0.00000002 ETH per unit of gas.
No. This tool converts between units within the same blockchain (e.g. BTC ↔ Satoshi, or ETH ↔ Gwei). Converting BTC to ETH requires a market price and belongs in a currency converter.