Antipode Coordinates Calculator
The antipode of a place is the point exactly opposite it through the centre of the Earth, the farthest you can get from where you stand. Enter a latitude and longitude to get the antipodal coordinates, the surface distance to that point (half the circumference), and the straight-through diameter. The transformation is simple: flip the latitude sign and rotate the longitude by 180 degrees.
Antipode formula
antipode latitude = -latitude
antipode longitude = ((longitude + 540) mod 360) - 180
surface distance = pi * R
through-Earth distance = 2 * R
The latitude is mirrored across the equator and the longitude is rotated half a turn, then wrapped into the standard -180 to 180 range. The surface separation is exactly half the great-circle circumference; the straight-line separation is the full diameter.
Worked example
New York City (40.7128 N, 74.006 W). Antipode latitude = -40.7128 (40.71 S). Antipode longitude = (-74.006 + 540) mod 360 - 180 = 105.994 (105.99 E), a point in the southern Indian Ocean. Surface distance = pi times 6,371.0088 = 20,015.09 km. Through-Earth distance = 12,742.02 km.
Antipode coordinates: frequently asked questions
What is an antipode?
An antipode is the point on the Earth's surface diametrically opposite a given location. A straight line through the planet's centre from your position emerges at the antipode. It is the farthest possible point from you along the surface.
How are antipode coordinates found?
Negate the latitude and shift the longitude by 180 degrees: antipode latitude = -latitude, antipode longitude = longitude + 180 (then wrapped to the -180 to 180 range). For example the antipode of 40 N, 74 W is 40 S, 106 E.
How far away is my antipode?
Along the surface it is half the Earth's circumference, about 20,037 km on the mean sphere. Straight through the planet it is one Earth diameter, about 12,742 km. This calculator reports both.
Are most antipodes on land?
No. Because oceans cover most of the planet, the antipode of a given land point is usually in the sea. Only a small fraction of land has a land antipode.
Sources and references
- National Geospatial-Intelligence Agency: WGS84 and Earth geometry.
- National Oceanic and Atmospheric Administration, National Geodetic Survey: coordinate fundamentals.
- Formula: standard antipodal transform on a spherical Earth.
Reviewed by the CalculatorHub team, edited by James Graham, 19 June 2026. See our methodology.