I have an acre of corn planted two feet apart. How many ears will I grow??:S2:

This is an impossible to answer question. We don't know anything about your grow. What is it, how was it grown, under what lights, using what nutes, CO2??, type of soil?

Even WITH all of that info we couldn't tell you ANYTHING! It's an impossible to answer question.

Your closest guesses would be: Take a picture a week before harvest. Post the pic here then see what people guess with a week left. I'd be surprised if even that could get you an accurate weight though.