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`D = "t" * c`

Enter a value for all fields

The **Distance Light Traveled** calculator computes the distance (**D**) based on the duration of travel (**t**) and the Speed of Light .

**INSTRUCTIONS:** Choose the preferred units and enter the following:

- (
**t**) Duration of travel - (
**v**) This is the velocity (travel speed) with a default of 1 c (the speed of light)

**Distance Traveled:** The calculator returns the distance (**D**) in astronomical units or light years. However, this can be automatically converted to other distance units via the pull-down menu.

The Math / Science

The formula for the distance that light has traveled is:

D = t•v

where:

- D is the distance that light has traveled
- t is the time it has traveled
- v is the speed of light.