Find metric "Speed, Degree, etc..." standard by location

Question

I have a program that displays the Weather in the current region of the users' computer.

The problem is that I want to automate the metrics conversion.

so for example in Europe, we measure the heat with Celsius and in the USA we measure it with Fahrenheit same goes for Km/H and M/H in speed respectively.

I want to know if there is a way to know the metric system of a country without having to write a hardcoded table for every country in the world.

Answer 1

Some operating systems expose an API to find the preferred measurement standard.

• For Android apps, use LocaleData.MeasurementSystem
• For MacOS, use CFPreferencesCopyValue (guide)
• For Windows, use GetLocaleInfo
• For IOS, use NSLocaleUsesMetricSystem (guide)

Otherwise, if you know their location, you can default to Imperial in the United States, Liberia or Myanmar and use Metric in other locations:

Regardless, you should still allow users to manually choose their preference.