I am about to buy some erc20 tokens, but the purchase would be a couple of hundreds USD each
I'd like to check the transaction costs, amount of gas needed to see if it makes sense for me
i have read that metamask provide you an estimation, but I am not using it, using MEW instead
tks
If you are not using metamask you can look up the current ETH gas price on different websites too. Coinmarketcap shows it only in gwei which is not very user friendly for crypto newbies like you are.
https://etherscan.io/gastracker also show you the transaction costs in $ and i personally also like gasnow.org because it also shows you the gas hourly gas prices in the last 7 days.
So you can estimate on which time of the day the fees are the lowest and you can therefore plan your purchase or transaction.