Convert coordinates from degrees, minutes, seconds (DMS) to decimal degrees (DD). Enter your DMS latitude and longitude and read the decimal-degrees value instantly — free, in your browser.
DMS (e.g. 48°51'30"N) is how coordinates traditionally appear on maps and in surveying. Decimal degrees (48.8584) is the single-number form GPS units, GeoJSON and most software expect.
Formula: DD = degrees + minutes ÷ 60 + seconds ÷ 3600, made negative for South or West.
DD = degrees + minutes/60 + seconds/3600, negated for S or W. Example: 48°51'30"N = 48 + 51/60 + 30/3600 = 48.8583°.
Input can be decimal degrees (48.8584), DMS (48°51'30"N or 48 51 30 N), or DDM (48°51.5'N). The tool outputs DD, DMS, DDM, Web Mercator (EPSG:3857) and UTM at once.
Latitude runs −90 to 90 (N/S); longitude runs −180 to 180 (E/W). Mixing them up is the most common mistake — enter each in its own box.
The DD/DMS/DDM conversion is pure math and works offline. Web Mercator and UTM use a small projection library that downloads once and is then cached.
No. Everything is computed in your browser — nothing is uploaded.
