Haversine Great-Circle Distance Calculator
Computes great-circle distance between two coordinates using the haversine formula in kilometres or nautical miles.
Enter Values
Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.
How to use this calculator
- Enter both points' latitude and longitude.
- Press Calculate.
- Read the great-circle distance in km, nautical miles and metres.
How it works
Uses the haversine formula to find the shortest distance over a sphere (radius 6,371 km) between two latitude/longitude points.
Worked example
Perth → Melbourne. ≈ 2,721 km (spherical).
Frequently asked questions
How accurate is haversine?
Within ~0.5% — fine for most uses. For survey-grade distances use the Vincenty ellipsoidal tool.
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Cite this tool
Zerdly. (2026). Haversine Great-Circle Distance Calculator. Retrieved from https://www.zerdly.com/tools/haversine-great-circle-distance-calculator/
Tip: Enter any known values to calculate the remaining results.
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