Ping Time to Distance Converter
Find
A 80 ms ping
at most 8,160 km (5,070 mi)
That is the farthest the server can be if the signal took a perfectly straight fibre path with no delays: half the round trip at 204,000 km/s. Real routes wander and routers, Wi-Fi and the server add time, so the true distance is usually well under this. Allowing a typical 30% detour and 2 ms of equipment delay, about 6,120 km (3,803 mi).
Even in a vacuum, light could not cover more than 11,992 km (7,451 mi) each way in that time.
Turn a ping time into the farthest a server can physically be, or a distance into the lowest ping possible, using the speed of light in optical fiber, with a realistic estimate that allows for indirect routes and equipment delay.
Formula
Worked Example
Light in fiber travels about 204,000 km/s, two-thirds of its speed in a vacuum. Half of the 80 ms round trip is 40 ms, enough for 8,160 km. Real routes are typically 30% longer than a straight line and equipment adds a few milliseconds, which brings it to about 6,120 km.
Frequently Asked Questions
What is the lowest possible ping between New York and London?
The cities are about 5,570 km apart, so the straight-line minimum through fiber is 2 × 5,570 ÷ 204,000 s ≈ 55 ms. Real transatlantic pings are usually 65–80 ms because cables don't follow the great circle and routers add delay.
Why is light slower in fiber?
Glass has a refractive index of about 1.47, so light travels through it at roughly c ÷ 1.47, about 204,000 km/s. Microwave and laser links through air come closer to the vacuum speed, which is why high-frequency traders pay for them.
Can ping tell me where a server is?
Only roughly. It sets a hard upper limit on distance, which can rule out locations, but routing, congestion, Wi-Fi and server processing all add time, so the true distance is usually well below the limit.