A light-year is the distance that light travels in a vacuum in one Julian year. It's a unit of astronomical distance.

While not a common practical conversion for everyday use, it's useful for understanding the immense scale of space in a relatable, albeit very small, unit for specific scientific or educational contexts.

For practical, everyday purposes, no. However, for illustrating the vastness of space in a more granular unit, or for specific scientific computations, it can be relevant.

There are approximately 372,480,314,960,629,900 inches in one light-year.