Convert Decimal to DMS

Turn Decimal Degrees (e.g., 35.689) into Degrees, Minutes, Seconds (e.g., 35° 41' 20").

How to Use

Enter Decimal Latitude and Longitude. Click Convert.

Online Tool

Input: Decimal

Output: DMS

Decimal Lat: Decimal Lon:

⚠️ 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.

📐 DISPLAY MODE: Standard Professional ▼

🔍 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 ≈ 30.9m. At 45°N latitude, 1 arcsecond of longitude ≈ 21.8m. This format is commonly used in aviation, maritime, legal documents, and older survey records.

⚠️ What if the datum was wrong?

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.

→ 10-Point Coordinate Pre-Flight Checklist

⚠️ 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

Related Coordinate Conversion Tools

US State Plane (SPCS) Converters & Local Guides

Professional engineering and surveying transformations from state-specific conformal grids to GPS WGS84.

📚 Fundamental Mapping Guides

Master geodetic theory and standard operating procedures to avoid expensive liability.

⚠️ Common Transformation Errors

The 1-2 Meter (3-6 Foot) NAD83 Shift: Because the North American Plate drifts, WGS84 and NAD83(2011) are currently out of sync by up to 2 meters in the conterminous US. Mixing these datums in construction or boundary litigation is catastrophic. Understand the precise offset mechanics.

🏛️ Reality-Anchor Case Studies

🌎 US State Plane (SPCS) Tool Hubs

High-accuracy Engineering & Cadastral Conversions (Lambert Conformal Conic / Transverse Mercator).

❓ Transformation Data FAQs

What is the MGRS precision level equivalent to distance?

MGRS precision depends on the digits after the 100km identifier: 10-digit (1 meter), 8-digit (10 meters), 6-digit (100 meters), and 4-digit (1,000 meters). True positional accuracy depends entirely on your initial GPS geometry collection.

Is UTM or State Plane Coordinate System (SPCS) more accurate?

SPCS zones are designed per state and minimize scale distortion (often 1:10,000) for a smaller confined footprint. UTM covers 6-degree global bands resulting in greater stretch (around 1:2,500). SPCS is highly preferred for US construction and cadastral surveys.