An isochrone is a contour line that connects all points reachable within a given travel time from a starting location. When a traveler approaches an international border, the isochrone must be adjusted to account for the additional processing time required at the checkpoint.
The total travel time to a border crossing can be expressed as the sum of the pure movement time and the fixed border‑processing delay. By estimating the great‑circle distance between the origin and the crossing point, and dividing by the chosen mode’s average speed, we obtain the movement component.
This widget combines the haversine distance formula with a user‑provided border‑processing time to give a quick estimate of how long it will take to reach and clear a border. The result helps planners decide on routes, departure times, or whether alternative crossings are more efficient.
d = great‑circle distance (km)
v = average speed (km/h)
t_{text{border}} = border processing time (minutes)
What is an isochrone?
How does the calculator adjust for international borders?
What factors are considered in the total travel time calculation?
Can I use this calculator for domestic borders too?
How accurate is the great-circle distance estimation?
Does this calculator consider different modes of transportation?
What is the purpose of the border-processing delay?
Results are for informational purposes only and do not constitute professional advice.