Am I on the right track?

Wingg_

I'm a 19 years old female, 159cm and 43kg (according to my country's BMI calculator I'm not underweight). So here's the problem, I eating 1640 calories daily and doing some light aerobic dance exercise everyday and I normally climb the stairs instead of taking the lift. I'm not gaining or losing weight eating that can it be my maintenance calorie? I'm wondering because I've read that people who're shorter than me can actually eat 1500-1600cal when they're sedentary. Is my activity level light exercise? I've tried using different TDEE calculator and they give me different values so I'm not quite sure which to follow. Fitnessfrog.com says 1735cal while scoobysworkshop.com says 1620cal...