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    TOD calculator - Image 1

    Description

    Top of descent calculator.

    This simple program calculates your top of descent. It tells you how many miles before your destination to begin your descent according to your inputs.

    installation:

    run the setup exe in the zip file.

    Note:

    To update, first uninstall TOD calculator in control panel>programs and features, then run the setup.

    Comments(14)

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    about 5 years ago

    Guys, some advice please for an amateur.
    I've used a simple rule of thumb for descent rate. I've taken ground speed X 5 as an estimate. So if my approach speed is 90 kts, I'd aim for a descent rate of 45p fps (400-500 fps). Or a slow craft with a landing speed of 60 kts I aim for 300 fps.
    Is this totally off?
    ad7324Author

    about 5 years ago

    The formula I used for this app is ((altitude-elevation)/(fpm)*(ground speed/60). Hope my app helps 🙂

    about 5 years ago

    So, ((1500-500)/500)*(90/60) gives me... 3 nm? Seems about right.

    almost 5 years ago

    TOD = Altitude to loose x 3 + deceleration segment

    ROD = Groundspeed x 5


    Deceleration (works fine for most jets):

    Without speedbrakes: 2 nm per 10 kts during 1000 fpm descent or, 1 nm per 10 kts in level flight.With speedbrakes: as above divided by 2.


    Props (including turboprops) have no trouble slowing down while following a 3 degree path, for turboprops there is also a rule of thumb for that:


    Height to start deceleration = IAS x 10 to be stabilized at 500 ft, add 500 ft in instrument conditions to be stabilized at 1000 ft.


    Works perfect in real life, have been using it for over 10 years no application needed.

    about 5 years ago

    This is what I have been missing. No more rapid descents to make the pattern entrance. Thank you very much for this.
    ad7324Author

    about 5 years ago

    No problem, enjoy :)

    about 5 years ago

    Thank you very much for your work, it would be very good to put one more parameter, speed, so it is valid for any type of aircraft.
    Greetings and thanks again for the tool.
    ad7324Author

    about 5 years ago

    Ok, thanks for the feedback, I will look into adding a speed option :)
    ad7324Author

    about 5 years ago

    I have just updated the app with your request, check it out!

    about 5 years ago

    Amazing, thanks!
    ad7324Author

    about 5 years ago

    Thanks, you're welcome :)
    Enjoy

    about 5 years ago

    Thanks! Pretty good and works fine
    ad7324Author

    about 5 years ago

    no problem :)
    MSFS 2020MSFS 2024

    TOD calculator

    Calculate your top of descent accurately with this simple program. Input your details to determine the ideal point to begin your descent before reaching your destination. Easy installation process included in the zip file for your convenience.

    Downloads3K
    Version1.5
    File Size9.14 MB
    Published5 years ago
    Updated5 years ago

    User Reviews

    5.0

    2 reviews

    5
    100%
    4
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    3
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    2
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    More Information

    Simulator
    MSFS2020
    CategoryUtilities
    Sub-CategoryApplications

    Version History

    -Average descent ground speed entry added

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