Degrees Minutes Seconds Converter
Use this tool to convert between decimal degrees and DMS (degrees, minutes, seconds) formats for maps, GPS coordinates, surveying, and GIS work.
Decimal Degrees → DMS
DMS → Decimal Degrees
What Is a Degrees Minutes Seconds Calculator?
A degrees minutes seconds calculator helps you convert angle values between two common formats:
- Decimal Degrees (DD) — a single decimal value such as 40.7128°
- Degrees Minutes Seconds (DMS) — split notation such as 40° 42′ 46.08″
If you work with GPS coordinates, navigation, engineering drawings, drone mapping, surveying, or GIS tools, you often need to switch between these formats quickly and accurately.
Why These Conversions Matter
Different systems and devices prefer different coordinate formats. For example, one mapping app may accept decimal degrees, while a field GPS receiver may display DMS values. Even a small conversion error can place a location hundreds of feet away from its true position.
Using a calculator like this avoids manual math mistakes and saves time when entering coordinates into software, route planners, CAD systems, or spreadsheet workflows.
How to Use This Calculator
Convert Decimal Degrees to DMS
- Enter a decimal value in the first section (for example:
-73.985656). - Select coordinate type:
- Generic angle to keep positive/negative sign notation
- Latitude for N/S output
- Longitude for E/W output
- Click Convert to DMS.
Convert DMS to Decimal Degrees
- Enter degrees, minutes, and seconds.
- Choose direction (N, S, E, W) or sign (+/-). If you skip direction, the sign of the degree field is used.
- Click Convert to Decimal.
Conversion Formulas
Decimal Degrees to DMS
- Degrees = integer part of absolute decimal value
- Minutes = integer part of (fractional part × 60)
- Seconds = remaining fraction × 60
DMS to Decimal Degrees
- Decimal Degrees = Degrees + (Minutes / 60) + (Seconds / 3600)
- Apply negative sign for south latitudes, west longitudes, or negative angles.
Worked Examples
Example 1: Decimal to DMS
Input: 34.052235
Output: 34° 3′ 8.046″ (approximately)
Example 2: DMS to Decimal
Input: 118° 14′ 37.2″ W
Output: -118.243667° (approximately)
Common Mistakes to Avoid
- Mixing latitude and longitude direction labels (N/S vs E/W)
- Forgetting to apply negative sign for South or West values
- Confusing minutes/seconds with decimal parts (e.g., 40.30 is not 40°30′)
- Rounding too early when high precision is required
Where DMS Conversion Is Commonly Used
- GPS and GNSS field collection
- Topographic maps and navigation charts
- Land surveying and property boundary work
- Geocaching and hiking route planning
- Geographic information systems (GIS)
Quick FAQ
Can minutes or seconds be greater than 59?
Standard DMS formatting uses 0–59 for minutes and seconds. This calculator still computes a valid decimal result if larger values are entered, but for clean notation you should normalize to standard ranges.
How many decimal places should I keep?
Use more decimal places for high-precision work (surveying, engineering), and fewer for general map browsing.
Is DMS better than decimal degrees?
Neither is universally better. DMS is often easier to read in navigation contexts, while decimal degrees are easier for calculations and software input.
Final Thoughts
A reliable degrees minutes seconds calculator is a simple but powerful utility. Whether you are converting a single coordinate or batch-processing location data, fast and accurate conversion helps prevent costly errors and keeps your geospatial workflow consistent.