Is Data Singular or Plural? Understanding Its Correct Usage
Quick Answer
Both are correct! In everyday English, we use data is. In science and academic writing, we use data are.
In a chat or email: The data is ready.
In a science report: The data are ready.
Both Are Correct — See How People Use “Data”
This is one of the few words in English where two different forms are both right. Look at these sentences:
- The data is on my computer. (everyday English)
- The data are on my computer. (science writing)
- This data shows a clear pattern. (everyday English)
- These data show a clear pattern. (science writing)
Did you see it? Both sentences in each pair are correct. The choice depends on where you are writing or speaking.
| Where you use it | Singular or plural? | Example |
|---|---|---|
| Chat, email, news | Singular (data is) | The data is clear. |
| Science, university | Plural (data are) | The data are clear. |
| Business report | Either works | Most people use “is.” |
When to Say “Data Is” and When to Say “Data Are”
The word data comes from a very old language called Latin. In Latin, “data” was already plural — like “books” or “cars.” One piece was called a datum. So if you talk about many pieces of information, the old rule says you should use data are.
But English has changed. Today, most people think of data as one big group of information — like water or news. You say “the water is cold,” not “the water are cold.” That is why most people now say “the data is” in everyday life.
Here is when to use each one:
- Use “data is” when you talk to friends, write emails, post on social media, or read the news.
- Use “data are” when you write a science report, a university essay, or a research paper.
Easy way to remember: Think about your reader. Are they your friend? Use data is. Are they your science teacher? Use data are. When you do not know, data is is safe almost everywhere today.
The Rule in One Line: “Data is” for everyday English. “Data are” for science and academic writing.
How to Use “Data” in Everyday English
Here are sentences you might really say or write at work, at school, or with friends:
- The data is saved on the cloud. (a normal work email)
- This data shows our sales went up last month. (a business meeting)
- My phone says my data is almost full. (talking to a friend)
- The data are in Table 2 of the report. (a university science paper)
- The new data suggest that the medicine works well. (a research article)
You are doing great. Now let us look at the mistakes most learners make with this word.
The Most Common Mistakes With “Data”
Even native speakers argue about this word — so if you feel confused, you are not alone. Big newspapers and famous writers do not all agree on the same rule. The good news? You almost cannot get it wrong, because both forms are correct. The mistakes below are about mixing them, not choosing one.
✗ The data is ready. The data are on page two. (mixing in one text)
✓ The data is ready. The data is on page two. (stay with one)
✗ The data are very interesting. (in a casual chat — too formal)
✓ The data is very interesting. (sounds natural)
✗ The datas are clear. (data has no “s” at the end)
✓ The data are clear.
How to remember: Pick one form for the whole text. If you start with “data is,” use “data is” until the end. Do not jump from “is” to “are” in the same email or report.
One more small thing: never write “datas.” The word data never adds an -s. It already covers many pieces of information by itself.
Other words from Latin that work the same way: media (one medium, many media), bacteria (one bacterium, many bacteria), criteria (one criterion, many criteria).
Test Yourself: “Data Is” or “Data Are”?
Choose the correct answer for each sentence. Pay attention to where the sentence is being used. Click Check to see if you are right.
1. In a text message to a friend: “Hey, the data ___ ready, I’ll send it now.”
2. In a university science paper: “The data ___ shown in Figure 3.”
3. Which sentence is wrong in every situation?
4. In a casual news article: “The new data ___ that more people are working from home.”
5. In a research report: “The data ___ collected from 200 people over six months.”
Keep Going — You Are Building Something
You just learned that data can be singular or plural — and you know exactly when to use each one. That is one more confusing word you will never get wrong again.
But here is something interesting. The word data is not the only Latin word that confuses everyone. What about bacteria? When your doctor talks about the bacteria in your body, are they talking about one bacteria or many? And is it correct to say “a bacteria”? The answer might surprise you.
Next lesson: Is Bacteria Plural or Singular?
Sources
The word data is most often used as a singular mass noun in educated everyday usage. Source
The Data Behind Data: Is It Singular or Plural? Source
My name is Khamis Maiouf. I am the creator of the English Teacher Site, dedicated to providing valuable resources and insights for students around the world. With a passion for education and a commitment to helping students enhance their skills, I aim to make English teaching more effective and enjoyable for both educators and students.
