Metres to Light years Converter

This converter changes a distance in metres into light years, the unit astronomers use to describe distances so vast that kilometres, and even millions of kilometres, become unwieldy. A light year is the distance light travels through a vacuum in one Julian year, so pairing a familiar unit like the metre with an astronomical one helps you make sense of distances across space, whether for a science assignment, a satellite or telescope calculation, or general curiosity about the scale of the universe. You simply enter a value in metres into the single input field, and the calculator instantly returns the equivalent in light years, using the exact factor of 1.057001e-16 light years per metre. Below the result you will also see the reverse factor, showing how many metres make up one light year, along with a worked example that walks through the maths step by step and a quick-reference table listing common metre values already converted for you. Because the conversion factor comes from the fixed, internationally defined length of a light year rather than a rounded estimate, the underlying maths is exact, though the figure shown on screen is rounded for readability. Use this tool whenever you need a fast, accurate way to move between everyday distances and the enormous scale used in astronomy, without working through the exponents by hand yourself.

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Value in metres (m)

1.057001e-16 ly

1 m =1.057001e-16 ly

1 ly =9.460730e+15 m

The formula

Multiply metres by 1.057001e-16 to get light years. In symbols, ly = m × 1.057001e-16. To go the other way, multiply light years by 9.460730e+15 to get metres.

Worked example

Convert 10 metres to light years: 10 × 1.057001e-16 = 1.057001e-15 light years.

Quick reference

Metres	Light years
1 m	1.057001e-16 ly
2 m	2.114002e-16 ly
5 m	5.285004e-16 ly
10 m	1.057001e-15 ly
25 m	2.642502e-15 ly
50 m	5.285004e-15 ly
100 m	1.057001e-14 ly

Frequently asked questions

How many light years are in one metre?

One metre equals 1.057001e-16 light years. Multiply the number of metres by 1.057001e-16 to convert.

What is the formula to convert metres to light years?

Metres times 1.057001e-16 equals light years. To reverse it, multiply light years by 9.460730e+15 to get metres.

Is the m to ly conversion exact?

The factor comes from the IAU definition of the light-year as the distance light travels in a vacuum in one Julian year (365.25 days) at the defined speed of light (299,792,458 m/s), giving 1 ly = 9.460730e+15 m exactly, so the conversion is exact. Displayed results are rounded for readability.

Who this converter is for

This converter is for students, tradespeople, travellers and anyone who needs to change metres into light years quickly and accurately.