Calculating Redemption Value

$700 flight or 40,000 miles

700/40,000 = 0.0175 cents/mile

But, how can I determine if that is a good valuation for those miles?

I know this changes depending on where the points came from (SPG vs UR vs airline mile)

So, my question is, how can I determine that valuation for different programs? How can I calculate what an AA mile is worth vs a UA mile vs a SPG point when burning them on a redemption?

How does this change when I do a "cash & point" redemption?

I've found the following valuations with no explanation as to why these points are valued as such.:

MR = $.020 / point
UR = $.019 / point
AA = $.015 / mile
DL = $.010 / mile
US = $.016 / mile
HH = $.007 / point
PC = $.006 /point
SPG =$.025 / point
Hyatt = $.015 / point

And let me also ask if I am using these correctly.

I redeemed a 145k AXON reward
Per the above valuation = $1,015.

I booked 4 nights at the conrad maldives, which would have cost $5,492, giving me a redemption value of $.0378 / point.

Are my calculations correct?