Conversion help

[marius135]

This is my first post...I hope it's not to technical a question.

I was reading about an Italian wine and it said it produced 80 to 100 quintals per hectare. Can anyone tell me how many tons per acre that would be? Thay grow 4,000 vines per hectare and I guess that comes out to 1618 vines per acre. As you can see I'm not mathematically inclined.
Thanks for any help you can give me!