How many calories should I be eating?

[Yobz]

I'm sure this is a common question here, but I'm looking to maintain my body weight and I have no clue how many calories to eat.

Since December I've lost a crapload of weight (210->160) and have been hitting the gym 5+ days a week. Until now I've basically been eating fewer calories...my log shows these caloric intakes (per day) for the past week or two:
1480, 1600, 1620, 1870, 1635, 1460, 1470, 1860, etc.

I've lost a ton of weight but I want to stop losing and just maintain. I've got a 6-pack now and am more than happy with the way I look. I'll continue to gym it up: how many calories should I be eating?