Millimeters to Light Years Converter
Convert millimeters (mm) to light years (ly)
Result
1 mm = 1.0570008 × 10⁻¹⁹ ly
1 mm in other units
- 1Enter a valueType the number to convert
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- 3Read the resultSee it in every other unit too
How to convert millimeters to light years
There are 9.46073 × 10¹⁸ millimeters in one light year, so divide the number of millimeters by 9.46073 × 10¹⁸.
ly = mm ÷ 9.46073 × 10¹⁸
1 mm = 1.057001 × 10⁻¹⁹ ly · 1 ly = 9.46073 × 10¹⁸ mm
Worked example
To convert 5 millimeters to light years: 5 mm ÷ 9.46073 × 10¹⁸ = 5.285004 × 10⁻¹⁹ ly.
About millimeters (mm)
A millimeter is one thousandth of a metre. Rain, screen sizes and engineering drawings are often measured in millimetres.
About light years (ly)
A light year is the distance light travels in one Julian year, about 9.46 trillion km. It is used for distances between stars.
More conversions
Millimeters to other units
Frequently asked questions
How many light years are in one millimeter?
One millimeter equals 1.057001 × 10⁻¹⁹ light years.
How many millimeters are in one light year?
One light year equals 9.46073 × 10¹⁸ millimeters.
How do I convert millimeters to light years?
Use the formula ly = mm ÷ 9.46073 × 10¹⁸. For example, 5 mm ÷ 9.46073 × 10¹⁸ = 5.285004 × 10⁻¹⁹ ly.