Convert decimal degrees to degrees decimal minutes (DDM), e.g. 48.8584 → 48°51.504'N — the format marine GPS and aviation use. Free, instant, in your browser.
DDM (degrees decimal minutes) keeps whole degrees but writes minutes as a decimal (48°51.5'), avoiding seconds. It's the default on many chartplotters and marine/aviation GPS units.
To convert from decimal degrees: keep the whole degrees, and multiply the fractional part by 60 to get decimal minutes.
DMS splits the fraction into minutes AND seconds (48°51'30"); DDM stops at decimal minutes (48°51.5'). DDM is common on marine GPS; DMS on maps and surveys.
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.
