Your personal calorie range is going to differ based on your weight and activity level. 1200 calories would not be enough for someone your weight!
Go to your nutrition tracker, and set up your diet settings. Make sure you choose a reasonable goal (for you, 1-2 lbs is attainable) and then go to your fitness tracker, and update your fitness settings. Enter an approximate calorie burn goal per week (0 if you're sedentary).
Sparkpeople will generate a range for you.
Here's how it's calculated, if you want to do the math yourself: www.sparkpeople.com/resource/calorie_calcu
There is no one-size-fits-all range for everyone. 1200-1550 is the minimum safety range here on Sparkpeople, but it's not appropriate for everyone. For example, I weigh 185, and am quite active... if I ate 1200-1550, I wouldn't get enough fuel to support my exercise.