http://www.calorieking.com/interacti...es-calculator/
Use this to find out your calorie maintenance (the amount of calories to maintain your current weight at rest), then subtract 10-20% of that to find how much you need to eat in order to lose weight. Generally it's more efficient to weight at a slow, consistent rate since you retain your lean body mass, and prevents you from going hungry easily. I said this bunch of times on these forums that you exercise isn't a requirement to lose weight but obviously helps.