As the Crow Flies Distance Calculator
Calculate the straight-line distance between any two places on Earth. Also known as great circle distance or air distance.
Straight-Line Distance
Route Information
What is "As the Crow Flies" Distance?
The phrase "as the crow flies" refers to the shortest distance between two points on Earth's surface. This is also known as:
Great Circle Distance
The shortest path between two points on a sphere, following the curvature of the Earth.
Straight-Line Distance
Direct distance between two points, ignoring terrain, roads, or obstacles.
Air Distance
The distance an aircraft would travel in a straight line between two locations.
Popular Distance Examples
How the Calculator Works
Our as the crow flies distance calculator uses the Haversine formula to calculate the great circle distance between two points on Earth:
- Enter Locations: Input any two locations - cities, addresses, or GPS coordinates
- Geocoding: We convert your locations to precise latitude and longitude coordinates
- Calculation: Using the Haversine formula, we calculate the shortest distance over Earth's curved surface
- Display Results: See the distance in multiple units with an interactive map
The Haversine Formula
a = sin²(Δφ/2) + cos φ1 ⋅ cos φ2 ⋅ sin²(Δλ/2)
c = 2 ⋅ atan2(√a, √(1−a))
d = R ⋅ c
Where φ is latitude, λ is longitude, R is Earth's radius (3,959 miles)
Frequently Asked Questions
Why is it called "as the crow flies"?
The phrase originated from the observation that crows tend to fly directly to their destination in a straight line, unlike humans who must follow roads and paths.
Is this the same as flight distance?
Not exactly. While "as the crow flies" gives the theoretical minimum distance, actual flight paths consider air traffic routes, weather, and safety regulations, making them typically 10-20% longer.
How accurate is this calculator?
Our calculator is accurate to within 0.5% for most distances, using Earth's mean radius of 3,959 miles (6,371 km) and precise geocoding data.
Can I use coordinates instead of place names?
Yes! You can enter coordinates in formats like "40.7128, -74.0060" or "40°42'46"N 74°00'22"W".