The antipode finder calculates the point on Earth directly opposite any location — the point you would reach if you drilled straight through Earth's center. Both the origin point and its antipode are plotted on an interactive Leaflet map with a connecting line.
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Antipode Results
How to Use the Antipode Finder
The antipode finder shows the point on Earth directly opposite any location. Enter coordinates, search by city name, or use your device's GPS. Both points appear on a world map with a connecting dashed line.
Step 1: Enter or Search for a Location
Either type latitude/longitude in Decimal Degrees, type a city name in the search box to get quick suggestions, or click "Use My Location" for GPS coordinates. Famous cities to try: Madrid, Spain (antipode near Chatham Islands, New Zealand), Buenos Aires, Argentina (antipode near Shanghai, China), or Auckland, New Zealand (antipode near Seville, Spain).
Step 2: Click Find Antipode
The antipodal coordinates appear in the results panel in both Decimal Degrees and DMS format. The map shows both points connected by a dashed line. The origin marker is teal; the antipode marker is orange. The nearest notable feature (country, ocean, or city) is identified from a reference dataset.
How Antipode Calculation Works
The math is simple: antipodal latitude = -lat (flip north/south), antipodal longitude = lng ± 180 (shift to the other side). For example, Madrid at 40.42°N, 3.70°W has antipode at 40.42°S, 176.30°E — a point in the ocean near the Chatham Islands east of New Zealand. Buenos Aires at 34.60°S, 58.38°W → 34.60°N, 121.62°E, which lands near Shanghai, China.
Most Antipodes are in the Ocean
About 71% of Earth is covered by ocean, so the probability that a random point's antipode is also on land is about 4%. The main antipodal land pairs: the southern tip of South America ↔ northeastern China/Russian Far East; Spain/Portugal ↔ New Zealand/Chatham Islands; Hawaiian Islands ↔ Botswana; parts of Antarctica ↔ the Arctic Ocean. Most of the continental United States has its antipode in the Indian Ocean south of Madagascar.
The "Fall Through Earth" Thought Experiment
If you could fall through a frictionless tunnel through Earth's center, you would reach the antipode in about 42 minutes — the same time regardless of the tunnel direction. This happens because the gravitational force along the tunnel follows a simple harmonic oscillator equation. The maximum speed would be about 7.9 km/s at Earth's center (the same as orbital velocity at Earth's surface), before decelerating as you rise toward the other side.
FAQ
Is this antipode finder free?
Yes, completely free. No signup, no account. Enter any coordinates and find the antipodal point instantly.
Is my location data safe?
All calculations run locally in your browser. No coordinates are sent to any server.
What is an antipode?
An antipode (plural: antipodes) is the point on Earth's surface that is diametrically opposite to a given point — directly on the other side of Earth. If you could drill straight through Earth's center from any location, the hole would emerge at the antipodal point on the other side.
How is the antipode calculated?
The antipodal latitude is simply the negative of the input latitude: antipode_lat = -lat. The antipodal longitude is 180° away: if lng > 0, antipode_lng = lng - 180; if lng ≤ 0, antipode_lng = lng + 180. For example, New York (40.71°N, 74.01°W) has antipode at 40.71°S, 105.99°E — which is in the southern Indian Ocean near Australia.
Is there any land at the antipode of my location?
About 71% of Earth's surface is ocean, so most antipodes fall in open ocean. Only about 4% of land has an antipodal point that is also land. Notable land-to-land antipode pairs include Spain↔New Zealand area, Argentina/Chile↔China/Japan, and a few others. Most of the US antipodes are in the Indian Ocean.
What is the distance through Earth to the antipode?
The straight-line distance through Earth's center is Earth's diameter: exactly 12,742 km (7,918 miles). This is a fixed value regardless of which antipode you calculate. The surface distance is half of Earth's circumference: about 20,038 km (12,451 miles).
What is the longest tunnel possible through Earth?
A tunnel through Earth's center would be 12,742 km long. Due to Earth's rotation and gravity, a frictionless tunnel not through the center would act like a pendulum, and a free-falling object would oscillate back and forth — reaching the other side in about 42 minutes regardless of the tunnel's direction.