How to convert ether from wei (and vice versa) with Web3 1.0.0

Hideyoshi Moriya

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May 14, 2018

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• Ethereum’s currency which is “Ether” has several units.
• The minimum unit of Ether is called “wei”.
• 1 ether = 1000000000000000000 wei.

Install Web3

• Web3 is a JavaScript library which can interact with Ethereum.

$ npm install web3

Example code

• How to convert ether from wei (and vice versa) with Web3 1.0.0

var Web3 = require('web3');
console.log(Web3.version);
// => 1.0.0-beta.34

const weiValue = Web3.utils.toWei('1', 'ether');
console.log(weiValue);
// => 1000000000000000000

const etherValue = Web3.utils.fromWei('1000000000000000000', 'ether');
console.log(etherValue);
// => 1