A kilometer is greater than a millimeter. I know that a km is greater than a mm because of something called conversion factors. So when we need to convert 1 kilometers into millimeters, we use a conversion factor to get the answer.

## What is a kilometer?

The kilometer (spelled kilometer in American English) is a metric unit of length equal to one thousand meters. In much of the world, it is now the standard measurement unit for communicating distances between geographical locations on land;

## What is millimeters?

The millimeter is a unit of length in the metric system, equivalent to one thousandth of a meter (the SI base unit of length). Metric unit of length equal to one thousandth of a meter, which is the SI base unit of length.

## How many millimeters in a kilometer?

1 kilometer is equal to 1000000 millimeter:

1km = 1km×1000000 = 1000000mm

## How many kilometers in a millimeter?

1 millimeter is equal to 0.000001 kilometers:

1mm = 1mm/1000000 = 0.000001km

## How to Convert Kilometer to Millimeter?

**1 km = 1000000 mm1 mm = 1.0E-6 km**

**Example: convert 15 km to mm:15 km = 15 × 1000000 mm = 15000000 mm**

## Present Uses of Kilometers:

A kilometer is equal to **1,000 meters**, in this, to measure the long distance, we use kilometer, which is the measurement between two places or points.

## Present Uses of Millimeters:

In terms of real-world comparisons, a millimeter is roughly the size of the wire used in a standard paper clip. The metric system is based on decimals: There are 10 mm in a centimeter and 1**000 mm in a meter.**