How many calories should a 5 foot 9 inch and weigh 170 pounds can eat?

The information you need can be found at:

http://www.ehow.com/how_5071440_determine-calories-needed-maintain-weight.html

Note: BMR = The answer to the calculation in step 1 of the website

This is also not 100% accurate as the exercise intensity per day is not specified. Unless you can find out how many calories you burn during exercise per day, you would not get an exact answer.