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Calculators / Science / Light travel time in vacuum
Light travel time in vacuum calculator
Convert a distance into the travel time of light in vacuum.
On this page
Travel time in seconds499s
Travel time in minutes8.32min
Calculator controls
How to calculate
Convert a distance into the travel time of light in vacuum.
Travel time in seconds =
d*1000/299792458 sTravel time in minutes =
d*1000/299792458/60 minWorked example
- Distance (km): 149597870.7
- Travel time in seconds: 499 s
- Travel time in minutes: 8.32 min
Assumptions and limits
Uses the exact vacuum light speed of 299792458 m/s. Travel through a material, moving endpoints and gravitational effects are excluded.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Convert a distance into the travel time of light in vacuum. Enter a path length in kilometres, not a time or an angular separation. The default distance is one astronomical unit.
When this tool is useful
Enter a path length in kilometres, not a time or an angular separation. The default distance is one astronomical unit.
Understanding your inputs
| Input | Example |
|---|---|
Distance (km) d | 149597870.7 |
Frequently asked questions
What does this model leave out?
Uses the exact vacuum light speed of 299792458 m/s. Travel through a material, moving endpoints and gravitational effects are excluded.
How do I reproduce the example?
Enter the displayed example values in their labelled units. Apply the formula before rounding; change one input at a time to compare scenarios.