Lighttime: Calculator Time and Distance of Light

Calculate distance per time or time per distance at the speed of light. Light spreads at a constant and very high speed. Here the distance in meters and kilometers that the light travels in a certain time can be calculated, or it is calculated how long it takes for a given distance. The speed of light in vacuum is preset. In the case of the light year, the year is calculated with exactly 365.25 days. Please enter time or distance to calculate the other value.

Speed of light c: m/s

Time: years, days, hours, minutes, seconds


Round to    decimal places.

Example: in 10 years, light travels 94.607 trillion kilometers.

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