How many light second in 1 millimeter?
The answer is 3.3356409519815E-12.

We assume you are converting between **light second** and **millimetre**.

You can view more details on each measurement unit:

light second or
millimeter

The SI base unit for **length** is the metre.

1 metre is equal to 3.3356409519815E-9 light second, or 1000 millimeter.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between light seconds and millimetres.

Type in your own numbers in the form to convert the units!

1 light second to millimeter = 299792458000 millimeter

2 light second to millimeter = 599584916000 millimeter

3 light second to millimeter = 899377374000 millimeter

4 light second to millimeter = 1199169832000 millimeter

5 light second to millimeter = 1498962290000 millimeter

6 light second to millimeter = 1798754748000 millimeter

7 light second to millimeter = 2098547206000 millimeter

8 light second to millimeter = 2398339664000 millimeter

9 light second to millimeter = 2698132122000 millimeter

10 light second to millimeter = 2997924580000 millimeter

You can do the reverse unit conversion from millimeter to light second, or enter any two units below:

light second to pica

light second to pes

light second to river

light second to mile

light second to tu

light second to zoll

light second to light-day

light second to point

light second to lap

light second to nanometer

A light-second is a unit of length. It is defined as the distance light travels in an absolute vacuum in one second or 299,792,458 meters. Note that this value is considered exact, since the meter is actually (as of 1983) defined in terms of the light second. It is just over 186,282 miles and almost 109 feet.

A millimetre (American spelling: millimeter, symbol mm) is one thousandth of a metre, which is the International System of Units (SI) base unit of length. The millimetre is part of a metric system. A corresponding unit of area is the square millimetre and a corresponding unit of volume is the cubic millimetre.

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