A Simple Flight Calculation tool based on an Excel spreadsheet to do quick in-flight calculations and conversions between different flight calculation metrics for more efficiency:
1.) TOD - Top of Descent Calculator (quick & dirty)
-> Simply enter your cruise altitude and your destination's airport landing altitude (also known as elevation AMSL) or the altitude (restriction) you want to be flying at a specific waypoint on the approach.
-> Based on the altitude information and restrictions on your planned route, the calculator tells you when to start your descent. This is called the Top of Descent (TOD).
For example:
Flying from EDDL to EDDM (Munich) at FL250 or 25000 ft, EDDM has a landing elevation of 1,487 ft (453 m) -> TOD: 71 nm (131 km) before EDDM
Flying from KJFK to KLAS (Las Vegas) at FL450 or 45000 ft, you want to be at 2000ft at a specific STAR waypoint for KLAS approach -> TOD: 129 nm (239 km) before waypoint of 2000 ft altitude
AGAIN THIS IS A VERY QUICK AND DIRTY CALCULATION AND DOES HAVE ITS LIMITATIONS!
DO NOT FORGET TO ADJUST THE BAROMETRIC PRESSURE DURING YOUR FLIGHT!
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2.) 3.00° Glideslope Calculator (quick & dirty)
-> Enter your current ground speed and the calculator tells you what fpm rate you need to be descending at in order to reach your desired waypoint/airport/altitude at a 3.00° glideslope.