As the Crow Flies Distance Calculator
Measure the exact as-the-crow-flies (straight-line great-circle) distance between any two points—street addresses, cities, 5-digit ZIP Codes, or latitude/longitude coordinates—in statute miles, kilometers, and nautical miles.
Enter two locations above or choose a sample pair to compute the straight-line (as-the-crow-flies) distance.
Straight-line (as-the-crow-flies) distance: This calculation measures the shortest spherical great-circle path over the Earth's surface, not driving road mileage or turn-by-turn travel time.
Great-Circle Path & Endpoint Details
Halfway point calculator Distance between cities Crow-flies distance Distance between ZIP Codes Radius map
What "As the Crow Flies" Distance Means and How It Is Computed
"As the crow flies" means the shortest direct distance between two points across the curved surface of the Earth, ignoring roads, bridges, terrain obstacles, and property lines. QuickWhere computes this distance along a spherical great-circle arc using the haversine formula and the International Union of Geodesy and Geophysics (IUGG) mean Earth radius of R = 6,371,008.8 meters, converting the result into U.S. statute miles (1 mile = 1,609.344 meters), kilometers, and international nautical miles (1 nmi = 1,852 meters).
Mix and Match Any Input Types
Unlike single-purpose distance calculators that only accept city names or only accept ZIP Codes, this tool lets you combine any four location formats for Point A and Point B:
- Full U.S. Street Addresses: Geocoded in real time via the U.S. Census Bureau Geocoder (for example, comparing a home address to a school, courthouse, or workplace).
- 5-Digit U.S. ZIP Codes: Resolved instantly to the official 2020 Census ZCTA internal centroid from our 33,791-ZIP static index.
- U.S. Cities and Towns: Autocompleted from 32,642 U.S. Census Bureau Incorporated Places and Census Designated Places.
- GPS Coordinates: Any worldwide latitude and longitude in Decimal Degrees (
35.7796, -78.6382) or Degrees-Minutes-Seconds (35° 46′ 46.6″ N, 78° 38′ 17.5″ W).
Why Great-Circle Lines Curve on a Web Map
When you measure a long distance (such as 500 miles or more), the line drawn on the interactive map curves gently toward the nearer pole. That curve is not a detour: because the interactive map uses a flat Web Mercator projection while the Earth is spherical, the shortest 3D path on the globe projects as a smooth curve (generated across 64 intermediate geodesic points) on a 2D screen. You can also visualize a full distance circle around a single point on our Radius Map Tool or find the middle town on the Halfway Point Calculator.