I'm sure I'm not the first one to ask this, so flame me if you want, but: "What is the most profitable coin to mine now?"
I still have a pile of old gpu's left, and it pains me to see them just lying there.
Mining is not profitable at all since ETH moved to PoS on 15 September 2022 and since then mining is not the same again.You should turn those GPU-s on only if you are in for the long term,to make some coins,since you asking about Ethash ETC is the main one with the most hash rate that is being mined but there are a couple of other variance coins like EthereumPow and EthereumFair which claim to be able to substitute the original Ethereum a promise far from being realized in near a year now.So only if you want to mine such coins and convert them to Bitcoin,hold to it for the next bull run only then power on those GPU-s,otherwise it is not worthy at all to mine now.
For calculators there are lots of them but as pointed out whattomine is the majority preference.