Straight-Line Distance Calculator

How to use this tool

1. Obtain coordinates for the exact endpoints you mean.
2. Enter latitude first and longitude second, using signed decimal degrees.
3. Calculate and keep endpoint labels with the result.
4. Consult a route source separately for real travel distance and duration.

How the calculation works

Haversine formula on a sphere of radius 6,371 km; miles = km / 1.609344.

A practical example

The default compares rounded London center coordinates (51.5074, −0.1278) and Paris center (48.8566, 2.3522), approximately 344 km apart on this model.

Load example restores the illustrative inputs and calculates. Reset restores those input defaults and clears the result. When an input changes, calculate again before exporting so your saved record matches the current assumptions.

Common mistakes

• Swapping latitude and longitude when both remain numerically valid.
• Losing west/south negative signs.
• Dividing this distance by a speed and calling it real travel time.

Limitations and interpretation

Spherical approximation. No route, geocoding, border, schedule, traffic, flight-duration or navigation information.

The result answers the stated calculation only. Check real bookings, provider rules and current route details separately where they affect your travel. Text exports are snapshots; the site does not synchronize or import saved results.

Privacy and your records

Coordinates are entered manually; no geolocation permission or map service is used.

Read the privacy policy for hosting and device boundaries. Downloaded files and clipboard contents exist outside this page.

Frequently asked questions