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Light Travel Time Calculator

Time for light to traverse a distance.

Compute the time for light (c = 299 792 458 m/s) to traverse a given distance, with results in seconds, minutes, hours, and years. Useful for one-way comm-delay estimates.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

t = distance / c

In depth

Compute the time for light (c = 299 792 458 m/s) to traverse a given distance, with results in seconds, minutes, hours, and years. Useful for one-way comm-delay estimates.