What's Your Next Step?
Understand the difference. Continue your journey with our precision tools and guides.
DMS to Decimal Degrees Converter
Convert Degrees, Minutes, and Seconds to Decimal format. Crucial for digitizing historic deed descriptions and survey records.
Quick Reference
DMS Formula: Decimal = Degrees + (Minutes ÷ 60) + (Seconds ÷ 3600)
Example: 4026'47"N = 40 + (26/60) + (47/3600) = 40.446944N
Pro Tip: Always verify hemisphere direction (N/S, E/W)—sign errors cause 180 positional mistakes.
DMS to Decimal Degrees — Conversion Table
Common DMS values and their decimal equivalents. Use this table for quick reference or verify your conversion results.
| DMS Input | Decimal Degrees | Description |
|---|---|---|
| 0 0' 1" | 0.000278 | One arc-second (~31 meters at equator) |
| 0 1' 0" | 0.016667 | One arc-minute (~1.85 km at equator) |
| 0 30' 0" | 0.500000 | Half a degree (~55.5 km at equator) |
| 1 0' 0" | 1.000000 | One degree (~111 km at equator) |
| 33 51' 54" | 33.865000 | Los Angeles, CA (latitude) |
| 35 41' 22.4" | 35.689556 | Tokyo, Japan (latitude) |
| 40 44' 55.7" | 40.748806 | Empire State Building, NYC (latitude) |
| 48 51' 24" | 48.856667 | Eiffel Tower, Paris (latitude) |
| 51 28' 38" | 51.477222 | Greenwich Observatory, London (latitude) |
| 90 0' 0" | 90.000000 | North Pole |
Related Coordinate Conversion Tools
Frequently Asked Questions
What is DMS format and why is it used?
DMS (Degrees, Minutes, Seconds) is the traditional format for expressing coordinates, inherited from maritime navigation. 1 degree = 60 minutes; 1 minute = 60 seconds. Professional surveyors and historical deed descriptions use DMS because it's human-readable and represents historical measurements from surveying instruments (theodolites, transits).
How many decimal places do I need for accuracy?
6 decimal places: 0.11m precision (professional standard). 5 decimal places: 1.1m precision (acceptable for GIS). 4 decimal places: 11m precision (land survey only with caution). Less than 4: Not acceptable for professional use.
What does N/S and E/W mean, and why is it critical?
N = North (positive latitude), S = South (negative). E = East (positive longitude), W = West (negative). Misinterpreting hemisphere causes a sign flip, placing coordinates 180 away. A fence built using the wrong hemisphere notation could end up on the opposite side of the Earth.
DDM vs DMS—what's the difference?
DDM (Decimal Degrees Minutes) is 4026.7867', while DMS is 4026'47.04". DDM is a hybrid format used by some GPS receivers. This tool converts DMS to pure decimal degrees (DD), the standard for GIS and professional mapping systems.
Certified Geodetic Insight
Verified against professional geodetic standards
The $50,000 Geodetic Drift Liability: NAD83 vs WGS84
Because the North American Plate moves ~2cm/year, NAD83(2011) and WGS84(G1762) currently diverge by over 2.2 meters. Using a "standard" GPS WGS84 coordinate for a high-precision NAD83 cadastral staking has triggered $50,000 Professional Liability claims for foundational rework and utility misplacement.
Risk Exposure Metric:
2.2-Meter Tectonic Drift & Epoch Accumulation
People also try:
Warning: Verify Your Calculation
Coordinate accuracy varies by device and datum. Do not use these results for legal or construction purposes without checking:
GPS Accuracy Alert
Your phone's GPS can be off by 30 meters. This can cause critical errors in your data.
Check My Accuracy →Datum Shift Risk
Using the wrong coordinate system (e.g. WGS84 vs NAD83) creates a permanent 1-meter offset.
Verify My Datum →Professional Context: Why Precision Matters
The WGS84 vs. NAD83 Dilemma
Most beginners assume that all latitude/longitude coordinates are the same. However, in North America, the difference between the WGS84 (used by GPS) and NAD83 (used for local surveying) can result in a physical shift of up to 1 meter. For high-precision construction projects, failing to account for this "datum shift" can lead to catastrophic misalignment of foundations or property boundaries.
Coordinate Drift Over Time
Tectonic plate movement means that your physical location on Earth is constantly moving relative to the GPS satellite network. In regions like Australia, this drift is significant enough that coordinate reference systems must be updated periodically. Our tools utilize the most stable geodetic algorithms to ensure that your conversions remain mathematically sound across different epochs.
DMS to Decimal Degrees FAQs
What does DMS mean?
DMS stands for Degrees, Minutes, and Seconds. It is the traditional way of writing coordinates, commonly found on old maps, nautical charts, and legal property descriptions.
Why convert DMS to Decimal Degrees?
Modern digital systems like Google Maps, GIS software, and smartphone GPS use Decimal Degrees. Converting DMS to Decimal makes the coordinates usable in these apps.
How many decimal places are needed?
Six decimal places (e.g., 40.123456) provide accuracy down to about 11 centimeters (4 inches), which is sufficient for most applications.