Latitude Distance Calculator
Enter two latitudes to find the north-south distance between them along a meridian.
Valid range: -90 to 90. North is positive, South is negative.
What this calculator measures
A latitude distance calculator computes how far apart two points are in the north-south direction, based only on latitude. In other words, it measures the distance along a meridian (a line running from the North Pole to the South Pole).
This is useful when you only care about vertical geographic separation, such as climate zone comparisons, migration routes, aviation planning checkpoints, and educational geography exercises.
How the latitude distance formula works
Latitude is an angular measurement. To convert the difference in latitude into a physical distance, we use the arc-length formula:
- Distance = Earth Radius × Angular Difference (in radians)
- Angular Difference = |Latitude 2 − Latitude 1|
This page uses Earth's mean radius of 6,371.0088 km for practical everyday calculations.
Quick interpretation of results
- Angular difference: how many degrees apart the two latitudes are.
- Kilometers / miles / nautical miles: converted north-south separation.
- Direction: whether the second latitude lies north or south of the first.
Example calculation
Suppose Latitude 1 is 40.7128 (New York region) and Latitude 2 is 34.0522 (Los Angeles region).
- Difference in latitude = |34.0522 − 40.7128| = 6.6606°
- Convert to radians: 6.6606 × π / 180 ≈ 0.11625
- Distance ≈ 6,371.0088 × 0.11625 ≈ 740.6 km
Note that this is only north-south distance. The full city-to-city route is much longer because longitude difference is ignored here.
When to use this vs. a full coordinate distance calculator
Use this latitude-only tool when:
- You only need meridional (north-south) separation.
- Longitude is unknown or irrelevant.
- You are teaching or learning basic geodesy concepts.
Use a great-circle or Haversine calculator when:
- You have both latitude and longitude for each point.
- You need true shortest-path distance on Earth’s surface.
- You’re doing route planning for travel, shipping, or navigation.
Accuracy notes
This calculator assumes a spherical Earth using the mean radius. That gives excellent estimates for many practical purposes. For ultra-precise surveying, advanced models use an ellipsoidal Earth and geodetic libraries.
- Great for education, planning, and general analytics.
- Slightly simplified compared with professional geodesic software.
- Rounded output is easier to read and compare quickly.
Frequently asked questions
Can latitude be negative?
Yes. Positive values represent the Northern Hemisphere; negative values represent the Southern Hemisphere.
What happens if both latitudes are the same?
The latitude distance is zero, because both points are on the same parallel line.
Is 1 degree of latitude always the same distance?
It is close to constant (about 111 km), but not perfectly constant due to Earth’s shape. This calculator uses a standard mean-radius approximation.
Final thoughts
A latitude distance calculator is a clean, fast way to estimate north-south geographic separation. If you later need full point-to-point distances, pair this with longitude-aware methods like the Haversine formula. For many everyday needs, this tool gives you a clear and dependable answer in seconds.