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Coordinate Converter
Paste GPS coordinates in any common format and get them in decimal degrees, degrees-minutes-seconds, degrees-decimal-minutes, UTM and MGRS. The format is detected for you, and everything works offline in your browser.
Last updated:
Decimal degrees, DMS, degrees + decimal minutes, UTM, MGRS/USNG or a Google Maps link. The format is detected automatically.
Enter your values to see the result.
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How to use the Coordinate Converter
- Paste your coordinates in the box: e.g. 40.7128, -74.0060, 48°51'30"N 2°17'40"E, 18T 583959 4507351 or 18TWL8395907350.
- Check the detected format at the bottom of the results to make sure it was read the way you meant.
- Read every format: decimal degrees, DMS, DDM, UTM and MGRS.
- Choose the decimal places for decimal degrees (6 places ≈ 11 cm).
- Copy the results or open the point on a map to double-check it.
Coordinate formats at a glance
| Format | Example (Statue of Liberty area) | Where you see it |
|---|---|---|
| Decimal degrees (DD) | 40.6892, -74.0445 | Google Maps, GIS, spreadsheets, APIs |
| Degrees, minutes, seconds (DMS) | 40°41′21.1″N 74°02′40.2″W | Paper maps, surveys, Wikipedia, aviation charts |
| Degrees, decimal minutes (DDM) | 40°41.352′N 74°02.670′W | Marine GPS, geocaching, handheld GPS units |
| UTM | 18T 580736 4504695 | Topographic maps, hiking, search and rescue, engineering |
| MGRS / USNG | 18T WL 80735 04695 | Military, emergency services, FEMA, US National Grid maps |
How the conversions work
- DMS ↔ DD:
DD = D + M/60 + S/3600. Going the other way, the fractional degrees × 60 give minutes and the fractional minutes × 60 give seconds. South and west are negative in DD. - DDM: the same, but the minutes keep their decimals instead of being split into seconds:
DD = D + M/60. - UTM: the zone is
floor((longitude + 180) / 6) + 1, with exceptions for zone 32V (southwest Norway) and zones 31X–37X (Svalbard). Latitude and longitude are projected with the Transverse Mercator projection on the WGS 84 ellipsoid, using a scale factor of 0.9996 and a false easting of 500,000 m; in the southern hemisphere 10,000,000 m is added to the northing. - MGRS: the UTM easting and northing are split into a 100 km square ID (two letters that repeat in a fixed pattern) and the remaining meters, which are truncated to the chosen precision.
MGRS precision
| Digits | Example | Precision |
|---|---|---|
| 0 | 18T WL | 100 km square |
| 4 | 18T WL 83 07 | 1 km |
| 6 | 18T WL 839 073 | 100 m |
| 8 | 18T WL 8395 0735 | 10 m |
| 10 | 18T WL 83959 07350 | 1 m |
Tips
- Latitude always comes first in DD unless letters say otherwise. If you get "latitude must be between −90 and 90", the numbers are probably swapped.
- UTM and MGRS are not defined north of 84°N or south of 80°S; polar regions use the Universal Polar Stereographic (UPS) grid instead.
- A UTM coordinate without a band letter or hemisphere is ambiguous. Write "18T", "18N" or "zone 18 south" to be explicit.
Frequently asked questions
How do I convert DMS to decimal degrees?
Use DD = degrees + minutes ÷ 60 + seconds ÷ 3600, and make it negative for south latitudes and west longitudes. For example 40°42′46″N = 40 + 42/60 + 46/3600 = 40.71278°.
How do I convert decimal degrees to DMS?
The whole number is the degrees. Multiply the decimal part by 60 to get minutes; multiply the decimal part of the minutes by 60 to get seconds. 74.0060° → 74°, 0.0060 × 60 = 0.36′ → 0′, 0.36 × 60 = 21.6″, so 74°00′21.6″W.
What is UTM and how do the zones work?
Universal Transverse Mercator divides the world between 80°S and 84°N into 60 zones, each 6° of longitude wide. A position is given as zone, latitude band letter, easting and northing in meters, e.g. 18T 583959 4507351. Southwest Norway and Svalbard use wider special zones, which this converter applies.
What is the difference between UTM and MGRS?
MGRS (also called USNG in the US) is built on UTM but replaces the long easting and northing with a two-letter 100 km square ID and shorter digits. 18T 583959 4507351 in UTM is 18T WL 83959 07350 in MGRS; fewer digits mean a larger square (8 digits = 10 m).
Which datum does this converter use?
WGS 84, the datum used by GPS, Google Maps and most phones. NAD83 differs from WGS 84 by about a meter or two in North America; older datums such as NAD27 or ED50 can differ by tens to hundreds of meters and need a datum transformation.
How many decimal places do I need?
Each decimal place of a degree is ten times more precise: 4 places ≈ 11 m, 5 places ≈ 1.1 m, 6 places ≈ 11 cm. Consumer GPS is accurate to a few meters, so 5 or 6 decimal places is plenty.
Why does my point land in the wrong place?
The most common causes are swapped latitude and longitude, a missing minus sign for west or south, or mixing DMS with decimal minutes. Add N/S/E/W letters to remove any doubt; the converter shows which format it detected.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.
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