Online Degrees Minutes Seconds Tool
DMS to Decimal Degrees Converter
Convert DMS to decimal degrees online and switch back from decimal degrees to DMS with support for multiple input styles, map preview, and quick copy.
DMS Input
Method 1: Paste Input
Method 2: Enter DMS Fields
Convert Degrees Minutes Seconds to Decimal Degrees
Understanding the basics of coordinate formats and how they are mathematically calculated.
Why Use This DMS to Decimal Degrees Converter?
DMS (Degrees Minutes Seconds) is a traditional coordinate format that divides each degree into 60 minutes, and each minute into 60 seconds. It remains widely used in aviation, marine navigation, cartography, and many GPS devices.
Decimal degrees (DD) express the same coordinate as a single number. Modern applications - Google Maps, GPS apps, GIS software - prefer decimal degrees because they simplify sorting, filtering, distance calculations, and database queries.
This converter bridges the gap. Whether you have coordinates from a GPS unit, aviation chart, or nautical map, our tool converts them instantly to decimal degrees and multiple other formats.
DMS to Decimal Degrees Formula Explained
The math behind the conversion is straightforward. A degree is composed of 60 minutes, and a minute is composed of 60 seconds. To convert to a decimal, divide minutes by 60 and seconds by 3600, then add them to the base degrees.
Important: For South (S) latitudes and West (W) longitudes, the final result is always negative.
Supported DMS Input Formats
Paste or enter DMS coordinates in several common notations used by GPS devices, charts, field notes, and GIS exports.
Standard Symbol Format
Supports classic notation such as 40°42'46"N, 74°00'21"W for direct conversion to decimal degrees.
Space-Separated Format
Handles coordinate strings such as 40 42 46 N, 74 0 21 W from field logs and plain-text exports.
Letter-Based Format
Parses inputs like 40d42m46sN or N40°42'46" commonly found in device exports and old documentation.
DDM and Mixed Formats
Accepts degrees decimal minutes and mixed coordinate strings, so you can normalize legacy inputs without manual cleanup.
How to Convert DMS Coordinates
Master coordinate conversions in 5 simple steps. Fast, accurate, and completely online.
Choose Direction
Select DMS to Decimal or Decimal to DMS using the tab bar at the top.
Enter Input
Paste a full DMS string, or fill in individual Degrees, Minutes, and Seconds fields.
View Results
Get instant outputs in DD, UTM, DDM, normalized DMS, and Google Plus Code.
Map Verification
Verify the precise location on the interactive map, or click the map to pick new coordinates.
Export & Share
Copy any output format with one click, open in Google Maps, or share a direct link.
Decimal Degrees to DMS
Use reverse conversion when a map, chart, field report, or workflow requires coordinates in degrees, minutes, and seconds instead of decimal degrees.
Printed Maps & Navigation
Convert decimal coordinates into DMS when a printed map, handheld GPS, or navigation workflow expects degrees, minutes, and seconds.
Field Reports & Survey Notes
Use decimal degrees to DMS conversion when field forms, legacy reports, or surveying notes need the traditional angular format.
Marine & Aviation
Many nautical charts and aviation references still present positions in DMS, so reverse conversion helps align digital coordinates with those materials.
Client Deliverables
Some project deliverables, permits, and field documents still ask for DMS notation even when the source coordinates start in decimal degrees.
Training & Education
Reverse conversion is useful for teaching how decimal degrees map back to degrees, minutes, and seconds in GPS and GIS training.
Coordinate QA
Displaying both decimal degrees and DMS side by side makes it easier to verify source data before sharing or exporting coordinates.
Frequently Asked Questions
Common questions about DMS to decimal degrees conversion.
What does DMS stand for in coordinates?
DMS stands for Degrees, Minutes, and Seconds - a traditional format dividing each degree into 60 minutes, each minute into 60 seconds. Widely used in aviation, marine navigation, and GPS devices.
How do I convert DMS to decimal degrees?
Use the formula: Decimal Degrees = Degrees + (Minutes / 60) + (Seconds / 3600). For S/W directions, the result is negative. Our converter handles this automatically.
What is the difference between DMS and decimal degrees?
DMS uses three components (e.g., 40° 42' 46" N), while decimal degrees use a single number (e.g., 40.713056). Most modern apps prefer decimal degrees for calculation simplicity.
Why does Google Maps use decimal degrees?
Decimal degrees simplify mathematical calculations and database queries - sorting, filtering, and distance calculations become straightforward with a single numeric value.
How accurate is 6 decimal places?
Six decimal places gives ~0.11 meter (11 cm) precision - more than sufficient for most GPS and mapping applications. Our calculator supports 5-8 decimal places.
What DMS formats does this tool support?
Our parser handles 8+ formats: standard symbols (40°42'46"N), space-separated (40 42 46 N), letter-separated (40d42m46sN), colon-separated (40:42:46N), dot-separated (N40.42.46), and DDM mixed (40°42.767'N).
What is DDM (Degrees Decimal Minutes)?
DDM keeps whole-number degrees and uses decimal minutes. It's used by marine GPS units. Example: 40° 42.7833' N. Our tool outputs DDM alongside DD and DMS.
Is my coordinate data kept private?
Yes - all conversions happen entirely in your browser. No coordinate data is ever sent to any server, ensuring complete privacy.