Ladies eating 2000+ cals and super active

I am at 2000 cal a day right now. I weight train 2x a week for an hr and teach water aerobics 1-2x a week for an hr and usually swim 2k yards a week. In addition, I ref anywhere from 2-6 hrs a week which requires fast paced constant walking. Usually every weekend I throw in some fun activity..

I hate keeping track of my exercise an adjusting my cal intake daily so I like the 2000 cal number every day.

Now... I am losing weight a little too fast and have a main goal of toning rather than losing.

How do you guys determine your cal intakes without using HRM or MFP exercise cals? I feel a little scared to eat over 2000....

Btw I am 5'6 150 lbs and 22 years old.