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Got this from someone:

Got this from someone

Calculating top cruise altitude:
Formula: Total Route Distance / 2
Subtract 10 from Ans
Divide by 3
Multiply by 1000
Example: TRD: 200nm/2 = 100nm
100nm - 10 = 90nm
90nm / 3 = 30
30 x 1000 = 30,000ft
So cruise at any altitude at or lower than FL300.

Calculating top of descent distance:
Formula: Cruise Altitude / 1000
Multiply by 3
Add 10 (optional)
Example: 30,000 / 1000 = 30
30 x 3 = 90
90 + 10 = 100
Start descent at 100nm out. This provides enough time to descend incrementally and level off at a reasonable speed.
Calculating VS:

Formula: Ground Speed x 5
Add 100 (optional)
For descent: Ans x -1
Example: 500 x 5 = 2500
2500 + 100 = 2600
2600 x -1 = -2600

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