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Key Features
Instant Calculation
Get accurate results in real time with our optimized algorithm.
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GPS coordinates show up in two common formats — Decimal Degrees (e.g. 51.4778) and Degrees-Minutes-Seconds (e.g. 51°28'40"N) — and different mapping tools expect different formats. This tool converts a full latitude/longitude pair between the two, both directions.
How it works
Decimal Degrees convert to DMS by splitting the whole-number degrees from the fractional part, then multiplying that fraction by 60 to get minutes, and the remaining fraction by 60 again to get seconds: DD = degrees + minutes/60 + seconds/3600 (with the hemisphere — N/S for latitude, E/W for longitude — determining the sign).
- Enter conversion direction.
- Enter latitude (decimal degrees) — for DD → DMS.
- Enter longitude (decimal degrees) — for DD → DMS.
- Enter latitude degrees — for DMS → DD.
- Enter latitude minutes — for DMS → DD.
- Enter latitude seconds — for DMS → DD.
- Enter latitude hemisphere.
- Enter longitude degrees — for DMS → DD.
- Enter longitude minutes — for DMS → DD.
- Enter longitude seconds — for DMS → DD.
- Enter longitude hemisphere.
- Click Calculate to see your results.
Examples
The Royal Observatory, Greenwich
51°28'40"N, 0°0'5.04"W converts to approximately 51.4778, -0.0014 in decimal degrees.
Who should use it
- Converting GPS coordinates from a device or survey document into a mapping app's expected format.
- Navigation, surveying, and geocaching.
Industry applications
- Navigation and GIS
- Surveying
- Aviation and maritime
Advantages
- Converts a full lat/long pair at once, not just a single value.
- Both directions supported.
Limitations
- Does not validate that a coordinate corresponds to an actual real-world location — only the numeric format conversion.
Common mistakes to avoid
- Forgetting to apply the correct hemisphere sign when converting DMS to decimal — a Southern or Western coordinate must be negative in DD.
Best practices
- Double-check which format your target mapping tool or GPS device expects before pasting in converted coordinates.
Tips
- If you only need to convert a single generic angle (not a lat/long pair with hemisphere), use the Degrees Minutes Seconds Calculator instead.