Confused about calories and BMR

I'm a 23 year old female, 5'7, small-framed and between 115-117 pounds currently. I'm not looking to lose anymore weight, but I would like to maintain my current weight. I'm moderately active (jog 30-40 mins 4 days a week, walk at least 15 mins a day on to work and school). I've been trying to calculate my bmr and getting very different numbers depending on the website I use. I'm currently eating about 1300-1400 calories (more if I exercise that day). How many calories do I need to eat per day to maintain my current weight?