For surveyors, architects and the curious

📐 GPS ⇄ UTM ⇄ Lambert-93 converter

Enter a point in any system, or use your phone's position: you instantly get all the other coordinates, with a link to the map.

Accepted formats for latitude and longitude: 48.8584, 48,8584 or 48°51'30"N.

Calculation accuracy: within a millimeter of reference libraries. The phone's own position is often only accurate to a few meters. Lambert-93 is computed assuming WGS 84 ≈ RGF93 (difference of about a meter at most).