You can easily work it out from the Bible. In Matthew 20:2 in a parable Jesus speaks of a man who hired unskilled workers for a day to work on his vineyard. The agreement was one denarius for one day. So a denarius in Jesus' day was the wages of an unskilled worker for a day. You don't need to translate that into dollars. Whatever your country, just think of how much an unskilled worker earns there. This will give you a better idea of its value. Workers could also be paid in Greek drachmas. The drachma was the Greek equivalent of a Roman denarius.