In one sentence, describe what the following article is about:

A flat surface is required to get an accurate measurement. You can put the shoe down on the floor, a table, or desk. Typically, a desk or table is ideal because it can be difficult to measure when you need to get down to floor level. A ruler or tape measure will ensure that you are getting an accurate measurement. It doesn't matter if you use a tape measure or ruler. It just needs to be long enough to measure the heel of the shoe. Take your ruler or tape measure and put the end of it just above the heel cap. Then, extend the ruler upwards, so that it reaches up towards the top of the shoe. End your measurement at the highest point on the back of the heel. Whatever length you get between heel cap and the highest point on your heel is the heel height. Above the heel cap is where the actual heel begins, but you can also measure the heel cap if you want to know how it factors into the overall heel height. If you use the Imperial System and live in a country that does as well, your heel height will typically be measured in inches. If you live in a country that uses the Metric System, your heel height will be measured in centimeters. If needed, you can easily convert the unit of measurement by using an online tool. For example, type "inches to centimeters" into Google and use one of the converter tools available.

Summary:
Put your shoe on a flat surface. Get a tape measure or ruler. Measure from the top of the heel cap. Use inches or centimeters to measure heel height.