Assuming you are around the 10 year/04 point. You will get right at about $200/drill.
So you need to do 48 IDT (Inactive Duty Training) Drills per year (weekend warrior) that all reserve/guard do) i.e. 4 drills per month. That ='s $800/month or $9600/year.
Minimum 2 weeks Active Duty (AT) at your regular active duty rate, which is $5799/mo. So expect about $2900.

If you go onto a flying billet: expect another (min) 48 Additional Training Periods (ATP), however, yours will be labeled Additional Flying Training Period (AFTP). Simply, as posted, can do 2 AFTP's per day as long as you "flew" once. It can be (depending on the unit) a simulator event. The intent of an AFTP (or ATP) is warfare specialty experience. Period. Flying is the reason it is built in the system. So 48 AFTP's = $9600/year. (CNATRA will often fund for 72 AFTP and VR can authorize 96, depends on budget etc)

Add them up: $9600 IDT drills/year+$9600 AFTP drills/year+$2600 for 2 week 'active duty'= $21,800/year minimum. ($1816/month)
Flt pay = $650/month or $21.67/drill, so 48 IDT drills+48 AFTP drills+ 2 week AT= $2405/year. Therefore, around $200/month. If you average it out, you will gross $2000/month.

Of course, lots of options in how to spread the drills around. Ask your unit for the specifics. May live local and come in and do one drill and go (4 hours). In any case. You will likely make more. I last flew where they added lots of extra active duty, AFTP drill were at 96, etc.
I averaged 12-15 days/month in my high flying year. (was not furloughed and didn't live local). If you are a Basic Unemployed Reserve Pilot (BURP) you can do the extra AT/ADT that often comes down the pike for extra dets, special needs of the unit)
Side note: The RMP drill is a creatively named ATP drill, it The additional training falls under Inactive Duty Training (IDT) funding as a Reserbve Mangement Period, (RMP). The RMP program designed for Naval Reserve unit leaders to manage their units more effectively. The unit commanding officer can issue the RMP to whomever is doing administrative work, such as fitness reports and evaluations, orders or awards. Specifically, RMPs can be used for day-to-day operation of the unit, accomplishing unit administration, training preparation, support activities and maintenance functions. RMPs can be used with two restrictions: There can be no more than one per day, and they cannot be combined with any other drills, including regular IDT.
Best of luck.