ETH to wei converter
Convert ETH into wei, the smallest indivisible unit of ether. One ether equals 10^18 wei, so this tool multiplies your ether input by that factor to give the exact integer wei value.
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The exact relationship
1 ether = 10^18 wei. To convert ETH to wei you multiply by 1,000,000,000,000,000,000. So 1 ETH is 1000000000000000000 wei and 0.001 ETH is 1000000000000000 wei. The result is always a whole number, because wei is the indivisible base unit.
Where you hit this in real work
When you build a transaction or call a contract, value fields must be expressed in wei, not ether. Sending 1 ETH means setting value to 1000000000000000000. Getting this multiplication right is essential, because an off-by-one factor of ten silently sends the wrong amount.
Preguntas frecuentes
Why do transactions use wei instead of ETH?
Wei is an integer, which avoids floating-point rounding errors. Encoding all amounts in the base unit keeps on-chain arithmetic exact and deterministic.
What is the wei value of 1 ETH?
1 ETH equals 1000000000000000000 wei, which is 10^18 wei.
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