How to Write Height Correctly - Writing Feet and Inches

Paul Baptist,
updated on
August 20, 2022

Writing feet and inches can be confusing if you're not accustomed to it.  How do you write out someone’s height when using feet and inches?  Why do English speakers typically use feet and inches instead of just stating everything in inches the way Metric users state a person’s height in centimeters or in meters with a decimal?  For that matter, why does anyone still use feet and inches at all?

While American Customary Units of Measurement (hereafter referred to as Imperial units for simplicity) may feel awkward to those not accustomed to them at first, the fact is that there is a solid logic behind their design and how they are used.  In this article we’ll shed some light on that through the lens of expressing common measurements such as a person’s height, then we’ll zoom out a bit and look at why they make sense to those who use them.

Keep reading and you'll learn exactly how to write height correctly with proper grammar.

What Do the Style Guides Say on Writing Feet and Inches?

Getting started, let’s take a look at what a couple of the most popular style guides say on the matter.  While these don’t reflect informal usage, each covers a specific range of formal writing.

The two style guides below, the Chicago Style Guide and the Associated Press style guide, are the most important style guides that exist. Most major publications follow one of these approaches with all of the writing and publishing. You should, too.

Chicago Style Guide to Writing Height Correctly:

The Chicago Manual of Style is the standard for formal American English writing in many spheres.  The correct method of writing height in Chicago style is to spell everything out exactly as it would be spoken.  The logic behind this is that it will avoid any ambiguity.  The feet are specified first using feet to indicate the unit of measurement, followed by the inches indicated by the unit inches:

  • “My father is five feet ten inches tall.”
  • “George Washington was six feet three inches tall.”

Note the lack of a comma between the units.  It’s just a space after the feet, followed by the inches.  If there are no inches left over after accounting for the feet, they are typically omitted unless absolutely required for clarity:

  • “John’s friend Jennifer is [exactly] five feet tall.”
  • “Our suspect is John Doe, his height is six feet zero inches tall.”

Another common option, especially if you want to emphasize that someone’s height is exactly a certain number of feet, is to say even in place of the inches:

  • “Jackie stopped growing at five feet even.”

Associated Press Style Guide to Writing Height Correctly:

The Associated Press issues its own style guide that is the standard for journalistic writing in the United States.  The primary difference between AP style and Chicago style is that AP style says to use digits to write the numbers:

  • “My father is 5 feet 10 inches tall.”
  • “George Washington was 6 feet 3 inches tall.”
  • “John’s friend Jennifer is 5 feet tall.”

The AP style guide also states that hyphens should not be used when writing the height of something except for when the height is being used as a description of something, such as this restated version of one of our earlier examples:

  • “Our suspect is a six-foot-zero man.”

Note that when used this way foot remains in its singular form, even when there are multiple feet.  When using this format the number of inches is always included, however the inches designator at the end is typically dropped—though if left in it would also stay in the singular:

  • “Our suspect is a five-foot-three-inch woman.”

Other Common Forms


While the style guides referenced prefer that the units be spelled out to prevent confusion, foot/feet can be abbreviated as ft. and inch/inches can be abbreviated as in. when used in the context of measurements.  Americans prefer to keep the periods at the end of the abbreviations, while British usage omits them.

  • “Our daughter Emily was 4ft. 8in. as of her last checkup with the doctor.”

No units—Just a hyphen in the middle

In informal contexts—especially speech—it is common to drop the units altogether, such as in the following exchange:

A: “How tall are you?”
B: “I’m five-four.”

In this example B is stating that he is five feet and four inches tall—the units are implied based on the context and a common understanding that we are using feet and inches as opposed to other units of measurement.

Singular “foot”, even with multiple feet

We touched upon this version when discussing AP style; here we’re going to dig in just a bit further.  As mentioned, this usage primarily appears when using the height as a descriptor for something else:

  • “The four-foot-eight child stretched his arm as far as he could to reach the top shelf of the bookcase.”

As discussed previously, when inches are mentioned the unit identifier is typically left off.  If it is included, it stays in the singular—the same as with the feet.

In cases where there are no inches you have a range of options in informal speech:

  • Zero: “Our great Dane, Marmalade, is four-zero at the shoulder.”
  • Even: “At seven-even, James was an exceptionally tall man.”
  • Nothing: “The shortest person in the family is Grandma Jones, at five-nothing.”
  • Nil: “At three-nil, little Jackie was hardly an imposing presence.”
  • Literally, nothing: “The ten-foot tree in the front yard was removed last Tuesday.”

The last form (where you drop the inches altogether) is most typically used when talking about objects or creatures other than people.

Using the Prime and Double Prime Symbols to Write Feet and Inches

One common way that you will see feet and inches written out is using the prime (′) and double prime (″) notation.  These markings are used in several contexts where you have a base unit (indicated by the primesymbol, which looks like an apostrophe or single quote) and a subdivision of that unit marked by a double prime symbol (which looks like a double quote).

For example, 5 feet 10 inches can be represented as 5’10” using this notation, since the foot is the primary unit of length in the Imperial system—hence its prime designation.  The next unit down in measuring length is the inch, so it is marked with the double prime.

This usage is especially common in diagrams (such as architectural blueprints or furniture assembly instructions).  You will also see people using it in most settings where they have to write measurements down by hand, such as entering their height on a form.

Caution: As mentioned, this notation is not exclusive to feet and inches.  While the context should make it clear in virtually all settings, it should be noted that another place where this notation is commonly used is recording durations.  Four minutes and 15 seconds can be represented as 4’15”, in addition to such forms as 4:15 and 4m15s.  Therefore, it is good to be aware of what you are looking at when you see something written out in this manner.

What if I don’t know the exact height to the inch?

Sometimes you don’t know someone’s exact height.  What should you do in these cases?  Are there any particular social conventions that should be followed?

Option 1: Give it your best guess

When you don’t know someone’s height, it is acceptable to estimate it in most contexts.  Naturally, this requires some familiarity with feet and inches to be able to say.  You can also buffer your statement by making a comparison against a known quantity:

  • “He was a little bit taller than me, so that makes him about five-five or five-six.”

Option 2: Round to the nearest half foot

While we typically do not subdivide feet into fractions, one exception to this is half feet.  Where precision is either not required or obnoxious to provide, it is customary to estimate heights or lengths to the nearest foot or half foot.

The default method for indicating half units is to add “and a half” in between the number and the unit.  So 5½ feet would be read as “five and a half feet.”

If there is only one whole foot, you can alternatively phrase this length as being “a foot and a half,” with the unit (a singular foot) being brought up before the and a half.

Why do we need to use feet AND inches, instead of just inches?

The short answer is that feet are the default unit of measurement in the Imperial system, and with the exception of half-feet mentioned in the previous section it’s not customary to subdivide feet into fractions directly—If you said that something was 5¼ feet or 5 1/3 feet you would get a strange look from people around you.

Hence, the default method is to state the number of whole feet and then express the remainder in inches:

  • “Darth Vader’s official height is 6 feet 9 inches.”

Conversely, inches do frequently get subdivided.  When talking about human heights they often get rounded to the nearest half-inch, though some people do prefer to keep it to the nearest inch all the same:

  • “At 5 feet 11½ inches, Jacob was always slightly insecure about his height.  He often just told people he was 6 feet tall.”

When measuring lengths in mechanical and carpentry settings, it is not uncommon to see the inch divided even smaller.  For lengths over one inch, the limit is often the quarter- or eighth-inch, however for lengths below one inch this binary division can continue further, with some drill bit and ratchet sets going to sixteenths, thirty-seconds, and even sixty-fourths of an inch.  Most tape measures go down to the sixteenth-of-an-inch level.  Unlike with Metric units, customary usage with Imperial units strongly favors fractions over decimals in most cases.

All of that being said, while the default rule is to read measurements in feet and inches, there are times where it would be appropriate to state things as simply being a set number of inches.  In particular, lengths of up to 2 feet may be expressed in inches alone:

  • “Wall studs are spaced at 16 inches apart on center.”
  • “The shelves are 18 inches
  • “Her first child was 20½ inches long when he was born.”

Additionally, you’ll sometimes hear someone read the total number of inches when reading from a tape measure,

What value do Americans find in Feet and Inches?

There are several reasons why Imperial measurements such as feet and inches have persisted in America and other parts of the English-speaking world, even in spite of periodic efforts over the years to migrate over to the Metric system.  Let’s take a brief look at some of the most significant ones.


When you boil it down, the biggest reason why the Imperial system remains is people’s familiarity with it. While this argument will become less relevant over time as more people become fluent in both systems, the inertia this familiarity generates cannot be understated.  Even in England, which switched over to the Metric system starting in 1965, the traditional units persist in at least informal usage in certain contexts (especially where human measurements and servings of alcohol are concerned), as well as in a range of idiomatic phrases and traditional proverbs:

  • “You give them an inch, they take a mile
  • Inching forward”
  • “The whole nine yards
  • “Going a mile a minute”
  • “An ounce of preparation is better than a pound of cure”

Even setting aside common sayings, however, the fact remains that once taught basic Imperial units they remain easy for people to picture.  Being based on the length of an actual foot makes it easy for someone to use their own foot or step as a basis for estimating the length of things.  Inches are similarly easy to grasp—which is more than can be said for the definition of most metric units (e.g. a meter is officially defined as “the length of the path traveled by light in a vacuum in 1/299,792,458 of a second.”).  In a world where things grow increasingly cold, precise, and impersonal every day, having things of a more organic, human nature provides comfort to many people.

Lastly, Imperial units of measurement feel more human because they put comfortable levels of granularity where people look for them when living their day-to-day lives.  Little exemplifies this better than measuring temperatures.

While the Celsius scale, with its basis centered around the freezing and boiling points of water, makes sense for scientific purposes, it has a range of about 40 degrees across the band where people primarily inhabit.  Conversely, the Fahrenheit scale has 100 degrees at near the highest people in most localities experience and 0 degrees at near the lowest that people in most localities will experience.  This places more than twice the number of degrees in the range the bulk of people inhabit with the 100-degree cutoff falling almost exactly at the official definition of a fever for medical purposes (the Centers for Disease Control define a fever as a body temperature of 100.4 degrees).


While base 10 is convenient for converting between different units, the increased number of factors makes the base 12 system underlying feet and inches far more convenient for division.

Ten millimeters (which are equal to a centimeter) is easily divisible by 10, 5, and 2, for example, but if you want to divide it four ways you start having to break it down into decimals, which grow increasingly complex every time you need to divide them further (dividing it into four parts would leave you with 2.5, eight parts would be 1.25, and sixteen parts would be 0.625).  Most significantly, representing division into thirds in Metric can be awkward, since 10 divided by 3 results in 0.3 repeating.

On the other hand, since a foot is based around the number 12 it is easily divisible by 12, 6, 4, 3, and 2.  This provides an immense amount of utility in common situations, and if further subdivisions are required the customary binary divisions of the inch mentioned earlier in this article take that into account.  Division by thirds is no longer an issue because the foot itself can be divided into three equal four-inch segments.  This logic is why some systems over the years have even employed a base 60 system, which provides all of the divisibility benefits of 12, plus the ability to divide cleanly by 5.

There you have it. This should help you learn to write height correctly.

Written By:
Paul Baptist

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