Metric Length
We can measure how long things are, or how tall, or how far apart they are. Those are are all examples of length measurements.
![20cm fork](https://www.mathsisfun.com/measure/images/cm-fork.jpg)
Example: This fork is 20 centimeters long
These are the most common measurements:
- Millimeters
- Centimeters
- Meters
- Kilometers
![id card](https://www.mathsisfun.com/measure/images/mm-card.jpg)
Small units of length are called millimeters.
A millimeter is about the thickness of a plastic id card (or credit card).
Or about the thickness of 10 sheets of paper on top of each other.
This is a very small measurement!
![fingers](https://www.mathsisfun.com/measure/images/fingers.jpg)
When we have 10 millimeters, it can be called a centimeter.
1 centimeter = 10 millimeters
A fingernail is about one centimeter wide.
![tape measures mm and cm side-by-side](https://www.mathsisfun.com/measure/images/tape-measures-mm-cm.jpg)
Two tape measures, one in mm, the other in cm
We can use millimeters or centimeters to measure how tall we are, or how wide a table is, but to measure the length of football field it is better to use meters.
![1 meter](https://www.mathsisfun.com/measure/images/guitar-length.jpg)
1 meter = 100 centimeters
The length of this guitar is about 1 meter
Meters can be used to measure the length of a house, or the size of a playground.
And because a centimeter is 10 millimeters:
1 meter = 1000 millimeters
![dog next to chair: 1m = 100cm = 1000mm](https://www.mathsisfun.com/measure/images/arrow-chair.jpg)
The back of this kitchen chair is 1 meter
![roads](https://www.mathsisfun.com/measure/images/roads.jpg)
When we need to get from one place to another, we measure the distance using kilometers.
The distance from one city to another or how far a plane travels can be measured using kilometers.
Final thoughts about measuring length:
![mm x10 cm x100 m x1000 km](https://www.mathsisfun.com/measure/images/mm-cm-m-km.gif)
1 centimeter = 10 millimeters
1 meter = 100 centimeters
1 kilometer = 1000 meters
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