--- title: "TIL: Haversine Calculations" description: Calculate the distance between two coordinates (points on a sphere) using the Haversine formula image: https://blog.gearflow.com/hubfs/haversine-formula.png --- [![New transparent Gearflow Logo HIGH RES (1)](https://blog.gearflow.com/hubfs/New%20transparent%20Gearflow%20Logo%20HIGH%20RES%20(1).png)](https://gearflow.com/) - [How it Works](https://gearflow.com/how-it-works) - [Pricing](https://gearflow.com/how-it-works#pricing) - [About](https://gearflow.com/about) - [Blog](https://blog.gearflow.com) [GET A DEMO](https://meetings.hubspot.com/peter-raisch/gearflow-demo) Technology # TIL: Haversine Calculations Calculate the distance between two coordinates (points on a sphere) using the Haversine formula [Christian Koch](https://blog.gearflow.com/author/christian-koch) Nov 26, 2025 --- Today I Learned (TIL) Haversine Formula > "The haversine formula determines the great-circle distance between two points on a sphere given their longitudes and latitudes. Important in navigation, it is a special case of a more general formula in spherical trigonometry, the law of haversines, that relates the sides and angles of spherical triangles. " > > [https://en.wikipedia.org/wiki/Haversine\_formula](https://en.wikipedia.org/wiki/Haversine_formula) > > [https://resources.wolframcloud.com/FormulaRepository/resources/Law-of-Haversines](https://resources.wolframcloud.com/FormulaRepository/resources/Law-of-Haversines) I was working on geolocating a user in order to find the closest point. I have previously used PostGIS to handle this distance calculation but for this use case, I wanted to calculate it on the client.  My colleague, Claude, and I did a bit of searching and quickly landed on this special case of spherical geometry and implemented a haversine calculation.  For the curious the implementation looked like this: `// Calculate distance using Haversine formula` `const getDistance = (lat: number, lng: number) => {` `  const R = 6371 // Earth's radius in km` `  const dLat = ((lat - locLat) * Math.PI) / 180` `  const dLng = ((lng - locLng) * Math.PI) / 180` `  const a =` `    Math.sin(dLat / 2) * Math.sin(dLat / 2) +` `      Math.cos((locLat * Math.PI) / 180) *` `      Math.cos((lat * Math.PI) / 180) *` `      Math.sin(dLng / 2) *``Math.sin(dLng / 2)` `  const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a))` `  return R * c` `}`   [Technology](https://blog.gearflow.com/tag/technology) [TIL- Today I Learned](https://blog.gearflow.com/tag/til-today-i-learned) ## Similar posts Gearflow Updates ### [Product Updates: AI-powered parts number look-ups, hands-free requests and more!](https://blog.gearflow.com/product-update-december-2024) We're sharing some pretty cool new features this month, all thanks to the feedback and support of our amazing customers Ben Preston Dec 9, 2024 Gearflow Updates ### [Product Updates: Automatically log orders, Order Now, and A.I. updates!](https://blog.gearflow.com/product-update-january-2025) We're sharing some pretty cool new features this month, all thanks to the feedback and support of our amazing customers Ben Preston Jan 9, 2025 Gearflow Updates ### [Product Updates: Mobile Parts Lists & A.I. 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