BYTETOOLS

Coordinate Converter

Convert GPS coordinates between decimal degrees, degrees-minutes-seconds and decimal minutes instantly. Paste any format like 40°26'46"N and copy the result.

Decimal degrees (DD)

40.446111, -79.982222

Degrees minutes seconds (DMS)

40°26'46.00"N 79°58'56.00"W

Degrees decimal minutes (DDM)

40°26.7667'N 79°58.9333'W

What is the Coordinate Converter?

The ByteTools Coordinate Converter translates latitude and longitude between the three formats used across GPS devices, GIS software and paper charts: decimal degrees (DD), degrees-minutes-seconds (DMS) and degrees decimal minutes (DDM).

  • Converts DD ⇄ DMS ⇄ DDM in one view
  • Flexible parser accepts 40°26'46"N, 40 26 46 N and signed decimals
  • Validates range: latitude ±90°, longitude ±180°
  • One-click copy for every output format
  • 100% private — coordinates never leave your browser
  • Free, no sign-up, works offline as a PWA

How to use the Coordinate Converter

  1. 1

    Type or paste a latitude into the Latitude field — decimal degrees, DMS or DDM all work.

  2. 2

    Type or paste the matching longitude into the Longitude field.

  3. 3

    Read the converted values in all three formats: decimal degrees, DMS and degrees decimal minutes.

  4. 4

    Click Copy next to any format to put it on your clipboard.

About the Coordinate Converter

The ByteTools Coordinate Converter translates latitude and longitude between the three formats used across GPS devices, GIS software and paper charts: decimal degrees (DD), degrees-minutes-seconds (DMS) and degrees decimal minutes (DDM). Paste a value in any of those formats — the parser understands 40.7128, 40°26'46"N, 40 26 46 N and 40°26.767'N — and all three notations appear at once.

It is built for surveyors, drone pilots, geocachers, sailors and developers who constantly juggle coordinate notations. Aviation and marine charts favour DDM, survey documents use DMS, while web maps and GeoJSON expect signed decimal degrees, so a reliable converter saves time and prevents transcription mistakes.

Everything runs 100% locally in your browser with JavaScript. Coordinates are never uploaded to a server, so it is safe to convert confidential site locations, client survey data or unpublished waypoints.

Frequently asked questions

How do I convert DMS to decimal degrees?

Divide the minutes by 60 and the seconds by 3600, then add both to the degrees. For 40°26'46"N that is 40 + 26/60 + 46/3600 = 40.446111°. South and West values become negative. This converter does the arithmetic for you the moment you paste the value.

What is the difference between DMS and DDM coordinates?

DMS (degrees-minutes-seconds) splits a degree into 60 minutes and each minute into 60 seconds, e.g. 40°26'46"N. DDM (degrees decimal minutes) keeps whole degrees but expresses minutes as a decimal, e.g. 40°26.767'N. DDM is standard in aviation and marine GPS units, while DMS appears on legal land descriptions.

How many decimal places do I need for GPS coordinates?

Five decimal places of a degree locate a point to about 1.1 metres at the equator, and six decimals to about 11 centimetres. Consumer GPS is only accurate to a few metres, so five or six decimals is plenty for almost every real-world use.

Why is my longitude negative?

In decimal degrees, the sign encodes the hemisphere: negative longitude means west of the Greenwich meridian and negative latitude means south of the equator. New York is at roughly 40.7128, -74.0060 because it lies in the western hemisphere.

Can I paste coordinates copied from Google Maps?

Yes. Google Maps copies coordinates as decimal degrees like "40.712800, -74.006000" — paste each number into its field and you instantly get the DMS and DDM equivalents. The parser also accepts the DMS strings Google shows in search results.

Are my coordinates uploaded anywhere?

No. The conversion is pure client-side JavaScript running in your browser. Nothing is transmitted, logged or stored, so confidential site locations and survey data stay on your device.

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