In fiber, light travels about 200,000 km/s, which is roughly 5 ms of one-way latency per 1,000 km. Round-trip time is double that, and real-world latency adds router and queuing delay on top. The propagation figure is a physics floor. The fiber latency calculator helps determine the time it takes for data to travel through a fiber optic cable between two points. Enter the addresses and click Calculate to see the results Theoretical latency comparison for different network mediums Note: Real-world latency is typically 1. 5-3x theoretical minimums due to routing paths (signals don't travel. Estimate fiber one-way delay and round-trip latency from route length, refractive index, propagation speed, optical equipment hops, frame serialization, endpoint processing, and link bitrate.
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