Bitcoin Forum

Hello anyone, u want to know about ethereum gas fee.

1. What is the minimum gas fee to perform a transaction to an exchange.

2. What can cause my transaction for fail, and if it fails will I get my tokens back to my wallet.

3. What proportion of gas will I use to send a particular amount of token

All your answers are here; a good article about Gas and Ethereum.
https://steemit.com/ethereum/@tomshwom/ethereum-gas-how-it-works

1. Minimum gas is 21,000
2. Transactions can fail if you run out of gas before the transaction has been verified
3. You will get back your ETH but not the gas already spent

So any thing lower than 21000 gwei will fail, is that correct

DO NOT use 21000 gwei. Gwei and gas are two different concepts (although I do not understand fully). Gwei can usually be between 25-50 and that should be enough. If you put 21000 gwei and 21000 gas it will

cost you hundreds or 000s of dollars to send. To reiterate use 21000 gas and roughly 25 gwei that should get the job done

1. you can use standard GAS fee in myetherwallet is enough to sending coin, ussualy under GAS in myetherwallet GAS not enough, several coin need big GAS, sample Taas need over 150k
2. GAS or sending fee not enough youre token back to youre wallet

I have always used the default MEW values, never really paid attention to it as I thought any excess would be booked back

Ethereum is still difficult to understand and as the price is still low, the transaction fees is not a large issue.

21000 gas should be a normal and reliable fees for you, But your transaction will be confirmed just on some minutes.  The limit out of gas will be able to make your transaction become fail.
Usually i was using up to 100k - 150k to send the erc20 token to the exchange sites, That was including in the reliable fees.

Thank you very much for the link I have actually been looking for something that explains how gas and eth work. It is a good article and I now understand.
Good share thanks.

This link here is a good one too http://ethgasstation.info/

Never use that much gwei. Gas and gwei are totally different things. On etherdelta, 2 gwei is even enough but very slow.

https://myetherwallet.groovehq.com/knowledge_base/topics/what-is-gas

Check the article above, it explains the concept very well.

I used web app, so gas fee is auto caculator! But i see about 21000 gas min for creat transation!

Sorry
so if we enter 21000 gwei
what a big mistake and the loss we will get
I think the number 21000 is a benchmark, I was wrong..