Unit of circle radius in google maps javascript api?

Question

I'm trying to draw a circle with radius X kilometers, but it occurred to me that the radius option isn't being measured in km, since the api example has a radius of 400,000 but only actually goes out about 500 miles.

does anyone know what unit it's using?

Answer 1

As the previous answer has indicated, meters is the default unit. So if you're after km, just multiply by 1000 for meters on the radius property.

// Add radius overlay to map
const set_radius = new google.maps.Circle({
    strokeColor: "#f38038",
    strokeOpacity: 0.4,
    strokeWeight: 2,
    fillColor: "#f38038",
    fillOpacity: 0.25,
    map: your_map_variable,
    center: new google.maps.LatLng(lat, lng),
    radius: 20 * 1000, // 20km
});

Answer 2

The standard unit is meters. Use math to adjust.