Check it here https://bitcoinfees.earn.com/, scroll down and you will see they says "The fastest and cheapest transaction fee is currently 310 satoshis/byte"
It's worth noting that it is based on what they calculate as a 90% chance of getting confirmed in the next block and is significantly higher than some other sites recommend using. In a situation like we have had over the last week, when a very large mempool is slowly being cleared, I find that bitcoinfees.earn.com recommended fee is very slow to come down. In fact, watching it over the last few days it has been 10 times higher than what would have been a sensible fee to get into the next 2 or 3 blocks.
