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運転距離計算機

ルーティングAPIが利用できない場合の推定道路距離と運転時間を算出します。

はじめに

Driving Distance Calculator — Estimated road distance and driving time when no routing API is available. Enter Origin latitude, Origin longitude, Destination latitude, Destination longitude, Routing factor, Average speed (km/h) to get an instant, accurate result.

計算式

Straight-line distance is calculated with the Haversine great-circle formula, then scaled by a routing factor (default 1.3×) — a commonly cited approximation that real road distance runs roughly 20–30% longer than a straight line, since roads bend around terrain, cities, and infrastructure. Driving time = estimated road distance ÷ average speed (default 100 km/h). This is an approximation, not a turn-by-turn routed distance.

ステップごとの説明

  1. Enter the Origin latitude.
  2. Enter the Origin longitude.
  3. Enter the Destination latitude.
  4. Enter the Destination longitude.
  5. Enter the Routing factor.
  6. Enter the Average speed (km/h).
  7. Click Calculate to see your result instantly.

実例

Example: With Origin latitude = 37.7749, Origin longitude = -122.4194, Destination latitude = 34.0522, Destination longitude = -118.2437, Routing factor = 1.3, Average speed (km/h) = 100, the Driving Distance Calculator gives Straight Line Km: 559.1206, Estimated Road Km: 726.8568, Estimated Road Mi: 451.6477.

よくある質問

Why not just show the straight-line distance?
Roads rarely run in a straight line, so this calculator multiplies the great-circle distance by a routing factor to approximate real road distance — it's an estimate, not an actual mapped route.
Can I adjust the routing factor?
Yes — 1.3× suits most regions, but you can lower it for flat, direct highway corridors or raise it for mountainous or indirect routes.
Will this match my GPS navigation app exactly?
No — a real navigation app calculates actual road-by-road distance, which will differ from this straight-line-based estimate, sometimes significantly on winding or indirect routes.
What inputs does the Driving Distance Calculator need?
You'll need to provide: Origin latitude, Origin longitude, Destination latitude, Destination longitude, Routing factor, Average speed (km/h). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Driving Distance Calculator?
The Driving Distance Calculator applies the formula exactly as calculated — Straight-line distance is calculated with the Haversine great-circle formula, then scaled by a routing factor (default 1.3×) — a commonly cited approximation that real road distance runs roughly 20–30% longer than a straight line, since roads bend around terrain, cities, and infrastructure. Driving time = estimated road distance ÷ average speed (default 100 km/h). This is an approximation, not a turn-by-turn routed distance. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Driving Distance Calculator free to use?
Yes, the Driving Distance Calculator is completely free, requires no signup, and runs instantly in your browser.

運転距離計算機について

The Driving Distance Calculator uses a real, verifiable formula — Straight-line distance is calculated with the Haversine great-circle formula, then scaled by a routing factor (default 1.3×) — a commonly cited approximation that real road distance runs roughly 20–30% longer than a straight line, since roads bend around terrain, cities, and infrastructure. Driving time = estimated road distance ÷ average speed (default 100 km/h). This is an approximation, not a turn-by-turn routed distance. — so results are accurate every time, not an approximation.