The history of the TEU (Twenty-foot Equivalent Unit)

Published: 28/10/19

Today, TEU plays an extremely important role in global trade. Not only is it the unit of measurement for the most popular types of shipping containers, but it is also used to measure vessel size and capacity and calculate port activity.

The history of the TEU (Twenty-foot Equivalent Unit)

What is TEU?

If you are new to the shipping world and are just starting to read up on how this complex and convoluted industry works, be prepared to come across list after list of different ocean freight acronyms.

Before you dive deeper, you should probably familiarize yourself with one of the most basic and common acronyms in shipping: TEU.

What does TEU stand for?

TEU, also known as Twenty-foot Equivalent Unit, is an important unit of measurement with widespread use in the ocean freight industry.

It’s used in everything and anything from determining cargo and merchandise capacity on shipping vessels and selecting a container type to calculating port activity.

But how did this universal unit of measurement come about? Who invented it, and how does it apply today? That is exactly what we’re going to tackle in this post.

History of TEU

Understanding the history of TEU is understanding the history of shipping containers.

TEU has its roots in the way shipping containers became standardized. The origin goes back decades to a man named Malcolm McLean.

As the story goes, McLean was a trucking entrepreneur who found the cargo loading and unloading process back in the early 1900s troublesome and time-consuming.

And it was.

There was no clear system in place then as there is today. Back in the day, goods, be it sacks, crates, barrels, or other forms, were being moved across different forms of transportation, sack by sack, crate by crate, barrel by barrel, however its form. Through that very same way, they were loaded and unloaded onto and from shipping vessels.

Needless to say, it was inefficient. Down at the docks one day in 1937, McLean witnessed this cumbersome process and thought there must be a better way to streamline and standardize the whole process.

So he took it upon himself to come up with a more efficient method that could do away with having to load cargo by cargo.

His ingenious solution? To create standard-sized containers that would hold cargo. These containers could be transported onto both trucks and ships without having to unload and load the cargo within every time the transportation mode changed.

Sure of his revolutionary idea, McLean sold his trucking company and began designing and building containers.

Once McLean had his containers ready, the next thing he needed was a shipping vessel that could hold the containers. So he purchased an oil tanker called Ideal X and redesigned it so that it would be able to hold 58 of his containers.

Ideal X

In April 1956, the very first voyage of containerized cargo set sail on the Ideal X from New Jersey to Houston, ringing in a new era of ocean freight.

Standardizing of shipping containers

But McLean’s shipping containers weren’t the standard containers we know today. His containers measured 35 feet long and at the same time, his competitor, Matson’s, was using 24-foot containers.

The discrepancy proved troublesome for the US government then, who wanted to ship more efficiently and called for even more standardization.

Following two rounds of standardization by the ISO in 1968 to define container classification, dimensions, and identification, 20-foot and 40-foot containers were born, of which the former went on to be called a Twenty-foot Equivalent Unit, bringing about the TEU as we know it today.

TEU’s versatility and practicality

TEU in vessel size and capacity

The TEU unit is very commonly used to measure shipping vessel sizes. Vessel sizes vary so much today that they are even categorized by different names according to their TEU capacity.

For example, some of the world’s largest containerships today have a carrying capacity of over 14,000TEU, while smaller feeder vessels manage 1,000TEU.

Here a look at how vessel sizes are commonly categorized according to their TEU capacity.