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737 Landing Calculator

Not approved by Delta or the FAA!


Altitude ft
Weight lbs
Runway Direction °
Wind Direction °
Wind Steady Speed kts
Wind Upper Gust kts
Slope %
Optional parameters to calculate slope:
  App end elev ft
  Far end elev ft
  Rwy Length ft


Steady headwind kts
Steady crosswind kts
Gust headwind kts
Gust crosswind kts
Additive kts
Slope %

Operational Landing Distances:

1 2 3 max max
***** ***** ***** ***** *****
***** ***** ***** ***** *****
***** ***** ***** ***** *****
***** ***** ***** ***** *****

Data is advisory and includes 15% safety margin and 1,500 ft. air distance from threshold to touchdown.


This is not an approved method of determining landing distances. This was developed without the approval or cooperation of Delta Air Lines or ALPA.

This is in the early stages. I have done no more than TLAR ("That Looks About Right") standard checking on a couple of cases. I have not thourougly tested it.

I retain rights to the code which was developed on my own time, but the underlying data belongs to Delta Air Lines.

My purpose in developing this is that such a tool should be avaible in the cockpit. While I retain rights to the code, I am quite willing to share the code and concept if you contact me. My purpose is not to sell this, but to demonstrate the concept of having a quick way of finding landing perfromance information from a tablet. Please note that the underlying data belongs to Delta Air Lines and is not mine to offer.


This uses the ODM data effective 12/31/2013. Thus, one could argue that the underlying data is FAA accepted.

It is necessary to enter a weight and altitude. You may leave other values blank if appropriate. A blank temperature will default to ISA for the altitude and all other values will default to zero.

Headwind and tailwind corrections to ODM data use the steady state value. The Vref additive is calculated using one half of the steady state headwind and all of the gust. The gust crosswing component is presented for crosswind limitations and is not used for data purposes.

This is written in Javascript and should be able to run offline on an iPad, Android, or Surface device.

iOS: This must be opened into GoodReader or similar program. It will not run in the preview mode if simply opened from an attachment. Hold on the attachment and open into GoodReader if you have it

Windows: Depending on the version, you might have to save the file to your computer and the open it locally. This is the case in Windows RT.

Mac: I have not yet tried it, but try saving to your hard drive and opening it from there.

Android: This should work but I have not tested it.

You can view the code. There are numerous ways to view the code, but the you can simply open the file in a program like Notepad if you do not have a better editor.


John Bell


Vers. Date Notes
2.0f 2014/03/14 Changed .innerText to .TextContent. This appears to work in Firefox now.
2.0e 2014/01/14 Changing an input value will not clear output matrix.
Cappeed Vref additive at 20 kts.
2.0d 2014/01/13 I changed the logic to show different runway conditions for a given flap setting.
2.0c 2014/01/11 I added option to include runway end elevations instead of slope.
2.0b 2014/01/02 I added a more explicit warning regarding the unapproved nature at the top.
2.0a 2013/12/30 Added 15% margin and 1500 feet beyone threshold notes.
1.0b 2013/01/01 Complete rewrite to match new ODM pages.
1.0a 2013/12/30 Initial version