Convert Light Years to Meters

This conversion helps you turn huge space distances into a standard metric unit.

It is useful for astronomy facts, school work, and science writing.

Quick Answer

1 Light Year = 9,460,730,472,580,800 Meters

Example 1, 2 light years = 18,921,460,945,161,600 meters.

Example 2, 4.5 light years = 42,573,287,126,613,600 meters.

meters = light years × 9,460,730,472,580,800

This means you multiply the number of light years by the number of meters light travels in one year.

A light-year is the distance light travels in one year, not a unit of time.

It is used because space distances are extremely large.

A meter is the basic metric unit for length.

It is a common unit used for everyday measuring and science.

Light-years are great for space, but meters are easier for calculations in science and math.

Proxima Centauri is about 4.24 light years away, that is about 4.01 × 10¹⁶ meters.
A star 10 light years away is 94,607,304,725,808,000 meters away.
A nearby star group at 100 light years is about 9.46 × 10¹⁷ meters away.
The Milky Way is about 100,000 light years across, that is about 9.46 × 10²⁰ meters.
If a telescope report says 2.5 light years, that is 23,651,826,181,452,000 meters.
A sci fi trip of 0.1 light year is 946,073,047,258,080 meters.
A distance of 50 light years is about 4.73 × 10¹⁷ meters.

For fast estimates, use 1 light year ≈ 9.46 × 10¹⁵ meters.
Move between forms, 9.46 × 10¹⁵ m is the same as 9,460,000,000,000,000 m (rounded).
If you need more accuracy, keep more digits, 9,460,730,472,580,800 m per light year.
When multiplying big numbers, use scientific notation to avoid mistakes.
Check your decimal, 0.5 light year is half of 9.46 × 10¹⁵ meters.
If your answer is not around 10¹⁵ meters per light year, you likely missed a zero.