HMC Crosswind Calculator is pretty straightforward.
Use the wheels at the bottom of the screen to set your heading (or expected runway heading), the wind direction, and the speed of the wind in knots. Pinching in or out will change the wind speed.

The resulting headwind and crosswind will be displayed at the top of the screen. A blue wind arrow will show graphically how the wind is striking your aircraft.
Tap the info button ("i") and your options will show.
The first option shows two more arrows, one at 0 or 180 degrees, one at 90 or 270 degrees, that show you the relative size of the headwind and crosswind vectors.
The next option lets you add your personal limit for crosswinds. Enter a number (or 0 (zero) for no limit), when the calculated crosswind exceeds that value the crosswind arrow will turn red.
The next two options allow you to break heading and wind direction into 1, 5 or 10 degree increments for finer results. Defaults to 10 degrees.
Next is a switch to turn on/off “dark mode”. Turing this mode on makes the background dark grey and the numbers/compass rose white. Useful in a dark cockpit.
Then there is a “gust reel” switch. Switching this ON adds a 4th reel where you can enter the max gust wind speed, and the resulting gust crosswind factor will show up after the standard crosswind factor.
Next is the ability to add decimal places to the calculations. You can select none, one, or two decimal places to be displayed.
In version 1.1.2 we also added the ability to enter values using a numeric keypad instead of the reels (suggested by user E.K.). Simply tap on a reel heading word (like "Heading") and the numeric entry pad will come up.
Then there is a button to send us feedback, and request any features that might help you, we're always interested!
The pilots at HMC Software.

What’s New

Version 1.1.3

Quick update, but we got some feedback on the new feature we wanted to address.
- Changed the text entry thing already. Instead of having to tap on all the headings, tapping on any heading brings up a panel where you can change multiple values at once. Just leave the text field blank if you don't want to change that setting.
- Put the Wx view back in, figured out what was wrong (extra space added to the URL request).
- Fixed a visual bug in the favorite headings code.

Ratings and Reviews

3.4 out of 5
8 Ratings

8 Ratings

Occasional games ,

Unit selection unreliable

You can select headings and units of 1, 5, or 10, but once you selected smaller number, display is stuck there even if you try to re-select display in 10 degree increments.

I uninstalled and chose a less “buggy” app that does the same task.

The Original Crazy Jo ,

Update wrecked app

Worked phenomenally before the last update. We used this often to determine flights now with updates it only works for increments of 10 even when changing settings

Luc1234 ,

Fonts and buttons way too small

Please the existing screen real estate. Make fonts and buttons five times larger.

App Privacy

The developer, Karen Meyer, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer's privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


Karen Meyer
1.5 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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