Ping to Distance Calculator

Convert a round-trip time into the furthest that server can possibly be.

What you provide

Time spent in routers and at the far end rather than travelling. Leave at 0 for the absolute ceiling.

How much longer the fibre path is than the straight line. Terrestrial routes are typically 1.4 to 2.

Result

20 ms is at most about 1,339,073 km away

Physics sets a hard floor on latency that no amount of bandwidth changes. Light in fibre covers roughly 200 km per millisecond, and cable never runs in a straight line, so a realistic figure is 100 to 150 km of geography per millisecond of round trip. This is why a server across an ocean cannot answer in 5 ms however it is provisioned, and why a claimed location that would need faster-than-light propagation is simply wrong. Read the result as a ceiling rather than an estimate: real round trips include queueing, forwarding and the far end taking time to reply, all of which add milliseconds that have nothing to do with distance.

Diagnostic telemetry
Round-trip time
20 ms
Fibre path lengthCable distance, at two-thirds the speed of light
2,008,609 km
Straight-line distanceAssuming the cable runs 1.5× the direct path
1,339,073 km
Absolute ceiling in vacuumNo signal of any kind can have travelled further
2,997,925 km
Earth circumference for scaleHalf of it, 20,038 km, is the furthest two points can be apart
40,075 km

What this cannot tell you

  • This is physics applied to a number you type in. It does not ping anything and cannot locate a server.
  • The answer is an upper bound, not a position. Real latency includes queueing and processing that add milliseconds unrelated to distance, so the true distance is always less than the ceiling shown.

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