QSL Card Distance Calculator

Calculate great circle distance and bearing between two Maidenhead grid squares for QSL cards and contest logging.

Your Grid: Field (1-18 = A-R)

Your Grid: Square (0-9)

Your Grid: Subsquare (1-24 = a-x)

Your Grid: Sub-digit (0-9)

DX Grid: Field (1-18)

DX Grid: Square (0-9)

DX Grid: Subsquare (1-24)

DX Grid: Sub-digit (0-9)

Tab to move between fields

Distance (Short Path)

10,777.9 km

Bearing (Short Path)

86.2°

Distance (Short Path)6,697.1 mi

Long Path Distance29,252.3 km

Long Path Bearing266.2°

Est. HF Hops4

Your Latitude-45.479°

Your Longitude-80.958°

DX Latitude7.604°

DX Longitude11.208°

Propagation Time Ms35.95

How to Use This Calculator

Enter your grid square using the field number, square digit, sub-square letter, and sub-digit.
Enter the DX station's grid square in the same format.
Review short-path distance (km and miles) and bearing toward the DX station.
Use long-path distance and bearing to point your beam in the opposite direction if propagation favors it.

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Formula

Haversine: d = R × arccos(sin φ₁·sin φ₂ + cos φ₁·cos φ₂·cos Δλ)

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