US Standard Lengths

Measuring how long things are, how tall they are, or how far apart they might be are all examples of length measurements. 
These are the most common measurements:

Small units of length are called inches.
The last joint of your finger or thumb is about 1 inch (depending on how big your fingers are!).
An inch is defined as exactly 2.54 centimeters (a metric measurement) 
Lots of things are measured in inches from rainfall to paper length.
Measuring in inches provide us with a way for everyone to understand the size of something.

When you have 12 inches together, it is known as a foot.
1 foot = 12 inches
A long time ago, people had to use their own feet to measure things. However, since everyone has different sized feet, it did not let everyone understand the size or distance in the same way.
Using 12 inches put together to make feet allows for everyone to have a more accurate picture of what exactly a "foot" of length is. 
When 3 feet are together, this is called a yard. (This isn’t the same thing as a lawn, though they are both referred to as a "yard"!)
1 yard = 3 feet
The length of this guitar is about 1 yard. 


When you put together 1,760 yards, you have a mile.
1 mile = 1,760 yards = 5,280 feet
Miles are long distances and are mostly used to measure the distance between places which are far away from each other. Most people refer to miles when they are driving, biking or jogging. 
Final thoughts about measuring length:
1 foot = 12 inches
1 yard = 3 feet = 36 inches
1 mile = 1,760 yards = 5,280 feet = 63,360 inches
More Examples
An inch is:
 about the width of a large thumb
 exactly 2.54 centimetres (it has a metric definition)
A foot is:
 about the length of a large foot
 slightly more than 30 centimetres
 exactly 30.48 centimetres (it has a metric definition)
A yard is about:
 half the length of a bed
 the width of a large fridge
 the height of a countertop
 four rungs up a ladder
 five steps up a staircase
 the length of a bike
 the depth of the shallow end of a swimming pool
 the width of a dining table
 the length of an acoustic guitar
 the height of a 5 year old
 shoulder to opposite wrist of an adult
 outstreched arms of a child
 waist high on an adult
 a long stride
 exactly 0.9144 meters (it has a metric definition)
A mile is about:
 how far you walk in 20 minutes
 2,000 paces
 1,000 counts of "leftright" when marching (as the Roman Centurions marched!)
 exactly 1.609344 kilometers (it has a metric definition)
