Antipodes Calculator
Dig straight down from any address, your current location, or a coordinate — and see exactly where you would come out, and whether it is dry land or open ocean.
Coordinates
Click anywhere on the map to move the green pin. The red pin is its antipode, and the line between them is the chord that would pass through the Earth's core.
Surprising antipodal facts
- About 71% of antipodes are underwater. Most of the Earth's surface is ocean, so if you pick a random point and dig down, you'll most likely emerge in the middle of the Indian or Pacific Ocean.
- The Philippines ↔ Brazil. Manila is nearly antipodal to eastern Brazil — one of the few large-land-to-large-land pairings.
- Spain ↔ New Zealand. Madrid and Wellington are the most-cited major-city antipodal pairing.
- Greenland ↔ Antarctica. The Arctic and Antarctic are roughly antipodal, which is why their daylight cycles are exactly opposite.
Three ways to set your starting point
- Search — type a city, street address or landmark; it is geocoded from OpenStreetMap data.
- Use my location — your browser asks permission, then supplies your position (GPS on phones, Wi-Fi/IP on laptops).
- Coordinates — enter latitude and longitude in decimal degrees, or click the map to drop a pin.
Frequently Asked Questions
Do I need to know my latitude and longitude?
No. Type a city, address, or landmark into the search box and it is geocoded for you, or tap Use my location to let your browser supply your position. Latitude/longitude fields are still there if you prefer to enter coordinates directly, and you can click anywhere on the map to drop a pin.
What is an antipode?
Your antipode is the point on the opposite side of the Earth — the place you would reach if you drilled straight through the core. For any latitude/longitude, the antipode has the latitude sign flipped and the longitude shifted by 180°. For example, the antipode of Madrid (40.4°N, 3.7°W) is near Wellington, New Zealand (~40.4°S, 176.3°E).
How is the antipode calculated?
The formula is simply antipodeLat = -lat and antipodeLng = lng + 180 (wrapped to the -180 to +180 range). No projection or spherical trigonometry needed — it is a pure sign-flip and 180° shift.
How do you know whether my antipode is on land or at sea?
The tool reverse-geocodes the antipodal coordinate against OpenStreetMap data. If a place comes back, you get its address; if nothing is mapped there, the point is almost certainly open ocean — which is the usual answer, since about 71% of the Earth is water.
Why is "dig straight down" not quite what happens?
Because the Earth is a slightly oblate spheroid (wider at the equator), a true straight tunnel between two non-antipodal points is curved. But for the geometric antipode, the chord through the centre is symmetric, so the calculation is exact for any reasonable model of the Earth.
Which places are antipodal to each other?
Land-to-land pairings are rare. Spain ↔ New Zealand, Argentina ↔ China, and the Philippines ↔ Brazil are among the few. For most of Europe and North America the antipode falls in the southern Indian or Pacific Ocean.