A good way to estimate is to use a figure of 14 calories per pound of bodyweight for a healthy adult who is moderately active (as in 30 mins of exercise about 3x a week).
So for you, that would be:
190 * 14 = 2660 calories to maintain your current weight.
To lose at a healthy rate, you should subtract about 30%. So for you that would be:
2660 * 70% = 1862 calories per day to lose weight safely.