That's how my nutritionist showed me to do it.
So yours would be 2650 if you didn't want to gain or lose.
To get to 170, your calories a day would be 1700. The difference between your maintenance calories and your goal weight calories is 950. So if you have a deficit of 950 every day (950 x 7 days a week = 6650), you'd lose just under 2lbs a week. (There are 3500 calories in a pound.) With the exercise you do every day, I'm sure you'd be over 7000 in a deficit which would be 2lbs.
The numbers aren't exact and a woman's body fluctuates with hormones, TOM, etc. but it's pretty accurate. Be sure to drink at least 64oz of water and try to keep your sodium down (not eating a lot of processed or takeout food, etc.).
I hope that makes sense.