How do I properly calculate these numbers?

Look at the values of your 2 properties, consider any outstanding debt, calculate what your payment might look like on a cash out refi, compare that to current or potential rents.

Make sure to also include in your calculation all the associated costs of those homes (maintenance, cap-x, management, vacancy, etc) then include the selling cost of the home since the appreciation isn't unlocked until you sell the home.

You calculated 8 turns a month?

The BRRRR calculator may help you understand this better as the results are shown in three different phases - rehab, post rehab and then post refinance.

& track my job costs against each category so I can compare my budget vs actuals and calculate the variances.For example:Electrical Budget: $4,000Electrical Actual: $6,300Variance: +$2,300This process is more tedious because you have to breakdown each invoice or receipt and allocate the costs to each Category, but it really helps you understand where you are spending your money and why you went over budget.Otherwise, it sounds like you are having trouble measuring employee productivity?  

@Marc Shin We're funding cash out refis for a lot of our most experience BRRRR clients right around day 91 (to pass 90 days of title seasoning) where we get the process started (appraisal, title, application, etc) around day 60  (plus or minus) when they have the place fully renovated and at least listed for rent (we'll use appraisers opinion of market rent to calculate DSCR). 

There are just numerous variables and calculations you must analyze to check. 

I've been playing with amortization calculators and have seen you can pay off 1/3 of the mortgage and reduce 2/3 of the duration.

Hi Scott, consider USFR for zero risk cash, earns 5.4% holding 8 week Floating rate note US treasuriesor for mild risk cash, consider BKN - BlackRock's Muni fund, earns 5.6% tax free, which for you would be >9% tax-equivalent yield, and if rates fall, the BKN etf will rise considerably, which though will be capital gains taxable :(, It holds intermediate term Municipals that are all GO, general obligation, so they can always tax us dumb schmuck citizens to pay off the notes instead of defaulting, so low risk but not zero risk for cash. ie (Orange county '90s)Inflation has already resolved, the 3 month trailing core PCE is at 1.5%, well below FEDs 2% target, so they will likely start cutting soon as the 12 month trail falls in line, that's why Powell changed his verbiage so much last Wednesday, and FOMC minutes speak of 150 bp cuts before the end of December as their expectation per their Dot Plots, the only question remaining is consumer spending,(>60% US economy), if falling like McDonalds/Starbucks/Uber saying then unemployment will accelerate and then possible recession, then 10yr yield falls even more, and bonds values would rise like Mike just said above.