JavaScript Leaflet and MongoDB radius

I want to use leaflet marker (for latLng) and a slider (for radius) for my search form.
The mongodb part will be like 

location: {
  $geoWithin: {
    $centerSphere: [[lon, lat], radius]
  }
}

But the radius seems never to be the right one.
What number must I divide/multiply to get it right?

Answer:1

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