Convert Decimal to DMS
Turn Decimal Degrees (e.g., 35.689) into Degrees, Minutes, Seconds (e.g., 35° 41' 20").
Quick Reference
Reverse Formula: If Decimal ≥ 0: DMS = Deg + Min/60 + Sec/3600. If Decimal < 0: Use S or W hemisphere.
Example: 35.6895° = 35° 41' 22.2" (roughly)
💡 Pro Tip: Decimal format is easier for computers; DMS is easier for humans and historical deeds. Always include hemisphere (N/S, E/W).
よくあるご質問 (FAQ)
Why would I need to convert decimal to DMS?
Historical property deeds, old survey records, and some professional surveying instruments record coordinates in DMS format. Modern GIS systems, maps, and GPS receivers use decimal degrees. Converting between them is essential for integrating legacy data with current systems.
Is my decimal degree more precise than DMS?
No—they represent the same precision. 6 decimal places (0.1m precision) is equivalent to 6 DMS digits with seconds. The format is different, but the information content is identical. Choose the format that matches your workflow.
What is rounding error in DMS conversion?
Converting 35.6895° to DMS and back may yield 35.68949°, not exactly 35.6895°. This is normal and represents sub-millimeter error at the equator. Modern professional conversions handle this with proper rounding protocols.
How do I know if a DMS coordinate is North/South or East/West?
Latitude uses N (North, 0°-90°) and S (South, 0°-90°). Longitude uses E (East, 0°-180°) and W (West, 0°-180°). If you see ±, positive is N/E, negative is S/W. Always verify with a map before using coordinates in construction or surveys.
How to Use
Enter Decimal Latitude and Longitude. Click Convert.
⚠️Datum Hazard: Read Before Conversion
Coordinate values only have meaning when attached to a Datum.
- WGS84: Standard for GPS, Google Maps, Web Mercator.
- NAD27: Used in older USGS topographic maps (pre-1983).
Using the wrong datum can shift your position by 20-100+ meters. Always verify the source datum of your coordinates.
🔍 What does Degrees / Minutes / Seconds mean?
DMS notation expresses geographic coordinates in degrees (°), minutes ('), and seconds ("). One degree = 60 minutes = 3600 seconds. At the equator, 1 arcsecond of longitude ≁E30.9m. At 45°N latitude, 1 arcsecond of longitude ≁E21.8m. This format is commonly used in aviation, maritime, legal documents, and older survey records.
Transposing minutes and seconds is a common data-entry error. A position recorded as 40°30'00" N vs 40°30'00" N looks identical but 40°03'00" N (transposed) is 27 km south. Always verify against a second coordinate format for critical applications.
⚠️US Liability & Accuracy Resources
Navigating boundary and construction projects across North America? Dig into the deep-dive state plane resources and litigation case studies:
Use Cases
- Reporting functionality for legal documents.
- Manual entry into legacy GPS units.
FAQ
Q: Why use DMS?
A: It is the traditional format for navigation and land surveying.
Q: How precise is the seconds output?
A: It calculates to 4 decimal places of a second.
Q: Does it work for South/West?
A: Yes, standard lat/lon rules apply (Western Hemisphere is negative latitude/longitude).
Professional Verification Disclaimer
This content is provided for decision-support and educational purposes for geospatial professionals and does not constitute legal, surveying, or engineering advice. Regulations and official standards vary by jurisdiction and project scope. Information is based on publicly available standards as of January 11, 2026. For critical projects, always verify current requirements with:
- Licensed Professional Surveyors or Professional Engineers (PE) in the relevant jurisdiction
- Certified attorneys for legal interpretation of regulations
- Current guidelines from relevant authorities (FAA, JCAB, GSI, etc.)
Reference: Professional Use & Scope
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