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Mount Greylock Coordinates

Massachusetts, United States · Elevation 1,064m

Quick answer: Mount Greylock is located at 42.637600, -73.166200 (N, W).

Different tools require different formats — Garmin devices default to DDM, military maps use MGRS, topo maps use UTM, and web apps expect Decimal Degrees. Copy whichever format your device or application needs. Click any format abbreviation to learn how it works.

All Coordinate Formats

DD

Decimal Degrees

42.637600, -73.166200
DMS

Degrees Minutes Seconds

42°38'15.36"N 73°9'58.32"W
DDM

Degrees Decimal Minutes

42°38.2560'N 73°9.9720'W
UTM

Universal Transverse Mercator

18T 650348 4722202
MGRS

Military Grid Reference

18TXN5034822202
Geohash

Geohash Encoding

drefx1cyp
Plus Code

Open Location Code

87J8JRQM+42

Map Location

Map data © OpenStreetMap contributors

Antipodal Point

The point on the exact opposite side of Earth from Mount Greylock. If you drilled straight through the planet's center, you would emerge here.

Antipodal coordinates

-42.637600, -73.166200

Hemisphere: S, W

DD

Decimal Degrees

-42.637600, -73.166200
DMS

Degrees Minutes Seconds

42°38'15.36"S 73°9'58.32"W
DDM

Degrees Decimal Minutes

42°38.2560'S 73°9.9720'W
UTM

Universal Transverse Mercator

18G 650348 5277798
MGRS

Military Grid Reference

18GXT5034877798
Geohash

Geohash Encoding

627vrn1cz
Plus Code

Open Location Code

47989R6M+WJ

MGRS Decoded

MGRS encodes location as a nested hierarchy — zone, band, grid square, and offsets. Here is what each component of 18TXN5034822202 means.

Component Value Meaning
UTM Zone 18 One of 60 vertical slices of Earth (6° wide each). Zone 18 runs -78° to -72° longitude.
Latitude Band T One of 20 horizontal bands (8° tall each), lettered C–X (skipping I and O). Indicates the general latitude region.
100 km Square XN A 100 × 100 km grid square within the zone/band. Column letter X (west–east) and row letter N (south–north).
Easting 50348 Distance east within the 100 km square. 5-digit value = 10 m resolution. Multiply by 1 to get meters.
Northing 22202 Distance north within the 100 km square. Same resolution as easting (10 m).

Geohash Precision

A geohash encodes coordinates by subdividing the Earth into progressively smaller cells. Each extra character roughly halves the cell area. The table below shows Mount Greylock's geohash at every precision level alongside the bounding box each level represents.

Length Geohash Cell Size
1
d
≈ 5,000 × 5,000 km
2
dr
≈ 1,250 × 625 km
3
dre
≈ 156 × 156 km
4
dref
≈ 39 × 20 km
5
drefx
≈ 4.9 × 4.9 km
6
drefx1
≈ 1.2 km × 610 m
7
drefx1c
≈ 153 × 153 m
8
drefx1cy
≈ 38 × 19 m
9
drefx1cyp
≈ 4.8 × 4.8 m

Precision 9 (highlighted) is the default and provides sub-5-metre accuracy for most applications.

About Mount Greylock

Mount Greylock is the highest point in Massachusetts at 3,491 feet (1,064 m). Located in Berkshire County, it features the Veterans War Memorial Tower and a lodge at the summit.

Live Converter

The coordinates above are fixed to this landmark. Use this converter to enter any other coordinates — such as a nearby trailhead, parking area, or a location you want to compare — and get all 7 formats instantly.

DD

42.637600, -73.166200

DMS

42°38'15.36"N 73°9'58.32"W

DDM

42°38.2560'N 73°9.9720'W

UTM

18T 650348 4722202

MGRS

18TXN5034822202

GH

drefx1cyp

OLC

87J8JRQM+42

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