Distance Calculator (Kilometers)
Enter two locations using latitude and longitude to calculate straight-line distance in kilometers.
What is a distance calculator in kilometers?
A distance calculator in kilometers helps you find how far two points are from each other. On this page, the calculator uses latitude and longitude coordinates and computes the shortest path over the Earth’s surface (also called the great-circle distance). The final output is shown in kilometers, and we also provide miles and meters for convenience.
This type of tool is useful for travel planning, shipping estimates, running or cycling route comparisons, educational projects, and geospatial analysis. Because it uses real Earth geometry, results are much more accurate than simple flat-map approximations across long distances.
How the kilometer distance is calculated
The calculator uses the Haversine formula, a standard method for determining the distance between two coordinate points on a sphere. It is widely used in mapping and navigation systems.
Formula overview
Where:
- φ = latitude in radians
- λ = longitude in radians
- R = Earth radius (about 6,371 km)
- d = distance in kilometers
How to use this calculator
- Enter the start point latitude and longitude.
- Enter the destination latitude and longitude.
- Click Calculate Distance.
- Read the result in kilometers (plus optional unit conversions).
Tip: If you copy coordinates from Google Maps, make sure latitude and longitude are in decimal format. Example: 48.8566, 2.3522 for Paris.
Common use cases
1) Trip planning
Compare straight-line distances between cities before planning flights, drives, or train routes. While road distance is usually longer, straight-line distance is still a great baseline.
2) Fitness and outdoor activities
Runners, cyclists, and hikers can estimate point-to-point distance for route experiments and challenge planning.
3) Logistics and delivery
Businesses can estimate relative distribution distances between warehouses and customer zones, helping with territory planning and cost benchmarking.
4) Education and data projects
Students and analysts often use coordinate-based distance calculations in geography, earth science, and location intelligence assignments.
Kilometers vs miles
Kilometers are part of the metric system and commonly used worldwide. Miles are still used in a few countries such as the United States. Quick conversion:
- 1 kilometer = 0.621371 miles
- 1 mile = 1.60934 kilometers
This calculator automatically shows both, so you can work in whichever unit is most useful.
Accuracy notes
- Results represent straight-line Earth-surface distance, not road distance.
- Coordinate precision affects output precision.
- Using a spherical Earth radius is highly practical for most use cases.
Frequently asked questions
Does this work worldwide?
Yes. As long as your coordinates are valid, you can calculate distance between any two points on Earth.
Can I use negative values?
Yes. Negative latitude indicates south of the equator. Negative longitude indicates west of the Prime Meridian.
Why is my driving distance different?
Driving distance follows roads and terrain. This calculator gives direct geodesic distance, which is usually shorter.