Degrees Minutes Seconds Calculator
Convert coordinates or angles between decimal degrees and degrees-minutes-seconds (DMS) format.
Convert coordinates or angles between decimal degrees and degrees-minutes-seconds (DMS) format.
How Degrees Minutes Seconds Calculator Works
A degree splits into 60 minutes, and each minute splits into 60 seconds — the same base-60 structure clocks use. Converting to DMS peels off the whole-number degrees, then converts the remaining fraction into minutes, then converts what's left of that into seconds.
Who Uses Degrees Minutes Seconds Calculator and Why
- Converting a GPS coordinate given in decimal degrees into DMS format to enter into an older nautical chart or navigation device.
- Converting a surveying angle recorded in degrees-minutes-seconds into decimal degrees for use in modern mapping software.
- Translating an astronomy coordinate (like a star's declination) between the two formats commonly used in star charts versus digital catalogs.
Mistakes to Avoid
- Forgetting to set the direction sign (N/E versus S/W) — a coordinate's DMS magnitude alone doesn't tell you which hemisphere it's in; the sign field determines whether the final value should be positive or negative.
- Entering minutes or seconds outside the valid 0-59 range — since both minutes and seconds are base-60 units, a value like 75 minutes should really be entered as 1 extra degree plus 15 minutes.
- Mixing up which field is degrees, minutes, and seconds when converting DMS to decimal — entering them in the wrong boxes silently produces a plausible-looking but wrong result.
Tips for Best Results
- Double-check the direction sign field separately from the numeric magnitude — it's easy to get the numbers right and the hemisphere wrong.
- If you're working with a coordinate from an older nautical or surveying source, remember that most modern consumer map apps expect decimal degrees, not DMS, as direct input.
Fixing Common Problems
My converted coordinate is showing the wrong hemisphere. — Check the direction sign selector — a correct DMS magnitude paired with the wrong sign choice (positive instead of negative, or vice versa) will place the coordinate on the opposite side of the equator or prime meridian.
Terms Explained
DMS (degrees-minutes-seconds): A base-60 format for expressing angles or coordinates, where each degree splits into 60 minutes and each minute splits into 60 seconds.
Decimal degrees: A format expressing an angle or coordinate as a single decimal number, the default used by most modern digital mapping tools.