How do I accurately convert ETH to WEI when sending transaction?

Question

I am trying to send ETH from one account to another but the conversion from ETH to WEI keeps giving me headaches. In this case, I am trying to send 0.11 ETH but in the confirmation window, I get 313.59464925 ETH instead.

// This is my transaction code

await window.ethereum
  .request({
    method: "eth_sendTransaction",
    params: [
        {
          from: window.ethereum.selectedAddress,
          to: "0x4dxxxxxxxxxxxxxxxxxx2dr9820C",
          value: String(0.11 * 1000000000000000000), // convert to WEI
          },
        ],
      })
  .then((result) => console.log(result))
  .catch((error) => console.log(error));

I have also tried using BigNumber but it doesn't solve the problem, I guess I'm messing something up. How do I accurately convert ETH to WEI?

Change `String(0.11 * 1000000000000000000)` to `"11e+17"`, or use `BigNumber` (or explain in your question how exactly you have tried using `BigNumber`). — , Feb 02 '22 at 12:21
BTW, not sure what you're expecting from `eth_sendTransaction`, but the result of that transaction should be a simple transaction hash, not an amount of ETH or anything like that. Converting that hash into a numeric value is pretty meaningless. — , Feb 02 '22 at 12:23

score 8 · Accepted Answer · answered Feb 02 '22 at 13:33

8

i prefer using web3 utils to have cleaner code and prevent unexpected bugs so with that you can write this:

value: "0x" + Web3.utils.toBN(Web3.utils.toWei("0.11", "ether")).toString(16)

answered Feb 02 '22 at 13:33

mahdikmg

833
2
6
13

John Doe · Answer 2 · 2023-07-24T06:47:08.007

5

Are you using ethers.js with hardhat? If yes, to convert Ethers to Wei, you can use ethers.utils as follows:

const { ethers } = require("hardhat");    
let ethersToWei = ethers.utils.parseUnits("1", "ether");

The code above converts 1 ether to equivalent Wei.

edited Jul 24 '23 at 06:47

answered Aug 15 '22 at 23:30

John Doe

87
1
9

Aun Shahbaz Awan · Answer 3 · 2022-11-23T11:11:11.163

5

In ES6 using node module ethers, you can convert Wei to Ether as follows:

import { ethers } from "ethers";
const WeiToEther = ethers.utils.formatEther(weiValue)

Convert Ethers to Wei as follows:

import { ethers } from "ethers";
const EtherToWei = ethers.utils.parseUnits("0.11","ether")

And to pass the ethers to your Function:

contract.yourFunction({ 
  value:  ethers.utils.parseUnits("0.11","ether")
});

edited Nov 23 '22 at 11:11

answered Sep 16 '22 at 07:28

Aun Shahbaz Awan

559
7
10

This converts Eth to Wei, OP asked for Wei->Eth – matewilk Nov 19 '22 at 00:45

score 2 · Answer 4 · answered Apr 19 '22 at 23:21

2

Alternatively, here is a one liner solution without Web3 utils:

value: Number(ether * 1e18).toString(16)

answered Apr 19 '22 at 23:21

zonay

1,453
9
17

What is `ether` please? – cy23 Apr 23 '22 at 00:44
1

The amount of Ethereum. – zonay Apr 24 '22 at 11:35

score 0 · Answer 5 · answered Apr 18 '23 at 13:28

0

A good suggestion found in ethersJS documentation is using such

ethers.utils.parseEther("1")

answered Apr 18 '23 at 13:28

Qudusayo

1,026
9
15

How do I accurately convert ETH to WEI when sending transaction?

5 Answers5

Linked