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Zone / Mileage — Great-Circle & Estimated Road

Straight-line distance between two US points, plus estimated driving miles for lane sanity checks. Accepts a 5-digit ZIP, IATA/ICAO airport code, or decimal lat,lon.

Points

From

ZIP · IATA · ICAO · lat,lon

Road factorGreat-circle multiplier for estimated driving miles

1.20 · default — Mixed lanes — typical LTL

Zone band widthMiles per rate band · 0 to disable

250 industry-standard LTL band · 100 / 500 carrier-specific bands

Great-circle vs roadGreat-circle·Road

Great-circle

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Road

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Enter two points to compare.

Formula

Great-circle (km) = 2R · atan2(√a, √(1−a)) where a = sin²(Δφ/2) + cos φ₁ · cos φ₂ · sin²(Δλ/2) (R = 6,371.0088 km (WGS-84 mean))
Great-circle (mi) = km ÷ 1.609344
Estimated road (mi) = great-circle × road-factor (1.17 long-haul · 1.20 default · 1.30 mountainous)
Zone band = ⌊road-miles ÷ band-width⌋ (Default 250-mi bands · industry-standard LTL zone width)

Source: NOAA great-circle calculator · US Census / GeoNames ZIP centroids · IATA/ICAO airport coordinates · road-factor rules-of-thumb from published LTL lane analyses (Chatterjee & Cato, TRB). Not rating-quality mileage — use as a lane sanity check.