Geography & Maps

Coordinates, distances and map projections.

37 tools

Antipode Finder Find the point on Earth diametrically opposite to any latitude/longitude.
Bearing & Midpoint Calculator Initial and final bearing plus midpoint between two coordinates.
Bearing → Cardinal Direction Translate a compass bearing in degrees into 16- or 32-wind cardinal direction names.
Beaufort Wind Scale Convert wind speed to Beaufort force with sea/land descriptions.
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Bortle Dark-Sky Scale Reference Look up what you can see at each Bortle class (1 = pristine dark, 9 = inner city).
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Bounding Box Builder Build a bounding box from points or a center+radius, in every common ordering.
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Centroid of Geographic Points Find the mean (centroid) of a list of lat/lng points on the sphere.
Constellation Visibility by Season Suggested constellations to look for tonight by season and latitude.
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Coordinate Distance Matrix Compute great-circle distances between every pair of lat/lng points.
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Country Border Lookup List the countries bordering any given country.
Country Capital & Facts Look up a country's capital, driving side, area and population.
Country Centroid Lookup Approximate geographic centroid for every country by name or ISO code.
Country Flag Emoji from ISO Code Convert a 2-letter ISO country code into its flag emoji.
Daylight Hours by Date / Latitude Estimate total daylight hours for a date at any latitude (CBM analytical model).
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DMS ↔ Decimal Coordinate Converter Convert latitude / longitude between decimal degrees, decimal minutes and DMS.
Free-Form Coordinate Parser Parse decimal, DMS or DM-formatted coordinates into a normalized lat/lon.
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Geohash Encoder & Decoder Encode a coordinate to a geohash or decode one back to a cell.
Golden Hour / Blue Hour Calculator Approximate morning and evening golden- and blue-hour windows for a location.
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GPX Track Stats Distance, ascent, descent, duration and average speed of a GPX track.
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Great-Circle Waypoints List N intermediate points along the great-circle route between two coordinates.
Haversine Distance Calculator Great-circle distance between two latitude / longitude points.
International Dial Code Lookup Look up E.164 country calling codes (+1, +44, +81 …).
ISO 3166-2 Subdivision Lookup ISO 3166-2 codes for US states and Canadian provinces.
Julian Day / MJD Converter Convert between calendar UTC, Julian Day Number and Modified Julian Day.
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Knot-Tying Reference Searchable reference of essential outdoor knots: use, strength rating and category.
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Maidenhead Grid Locator Encode and decode amateur-radio Maidenhead grid locators.
Map Projection Reference Searchable reference for common map projections — what each is good for.
MGRS Coordinate Converter Convert latitude / longitude to a Military Grid Reference (and back).
Moon Phase Calculator Compute moon phase, age (days) and approximate illumination for any date.
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Plus Codes (Open Location Code) Encode and decode Open Location Codes (Plus Codes).
Point in Polygon (Geofence Test) Test whether a lat/lon falls inside a polygon (geofence).
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Polygon Area (lat/lng) Compute the area of a polygon on Earth from lat/lng vertices.
Rhumb Line Calculator Compute constant-bearing rhumb-line distance and heading between two coordinates.
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Sidereal Time Calculator Compute Greenwich and Local Mean Sidereal Time for any UTC date/time and longitude.
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Slippy Map Tile Coordinate Convert between lat/lng and slippy map tile X/Y/Z.
Sunrise / Sunset / Twilight Calculator Sunrise, sunset, solar noon and the three twilight bands for a date and lat/lon.
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UTM Coordinate Converter Convert latitude / longitude to UTM zone, easting and northing (and back).