The quickest way to add subscript in Word

To type subscript in Microsoft Word, select the text you want to make smaller and raised, then press Ctrl + = (on Windows) or Cmd + = (on Mac). The text shrinks and shifts down below the baseline when ready. Press the same keys again to turn subscript off and return to normal text.

If you prefer using the menu instead of keyboard shortcuts, you can go to the Home tab, find the Font group, and click the small arrow next to the font size box. Select Subscript from the dropdown. This method takes a few more clicks but works the same way.

Subscript is useful for chemical formulas (like H₂O), footnote numbers, mathematical expressions, and any text that needs to sit below the line. Word keeps the subscript formatting even after you move to a new word, so you'll need to turn it off manually when you're done with that section.

Key Takeaways

  • Press Ctrl + = on Windows or Cmd + = on Mac to toggle subscript on and off for selected text.
  • You can also use the Home tab menu: click the Font dialog arrow and select Subscript from the dropdown.
  • Subscript text appears smaller and sits below the baseline of regular text.
  • Once you turn subscript on, it stays on for all new text you type until you press the shortcut again to turn it off.
  • Superscript uses the same process but with Ctrl + Shift + = (Windows) or Cmd + Shift + = (Mac) if you need text that sits above the line instead.

Using the keyboard shortcut method

The keyboard shortcut is the fastest way if you type subscript often. On a Windows computer, hold down Ctrl and press the = key (the equals sign, not the plus sign). On a Mac, hold Cmd and press =. You don't need to hold Shift.

The order matters: select your text first, then press the shortcut. If you press the shortcut before selecting text, Word turns subscript mode on, and everything you type next will be subscript until you press the shortcut again to turn it off. This works fine if you know you're about to type subscript, but selecting text first is more reliable.

If the shortcut doesn't work on your keyboard, your keyboard layout or language settings might be different. Try the menu method instead, which works the same way on any keyboard.

Using the Format menu

Open the Home tab at the top of Word. In the Font group (usually on the left side of the ribbon), you'll see a small downward-pointing arrow next to the font size numbers. Click that arrow to open the font formatting dialog.

In the dialog box that appears, look for the Effects section. You'll see a checkbox next to Subscript. Click the checkbox to turn it on, then click OK. Any text you had selected will now be subscript. If you want to turn subscript off, repeat the same steps and uncheck the box.

This method is slower than the keyboard shortcut but gives you a clear visual confirmation that subscript is turned on. Some people find it easier to remember than memorizing a keyboard combination.

Subscript versus superscript

Subscript text sits below the baseline (the line that regular letters sit on). Superscript text sits above the baseline. They look similar — both are smaller than regular text — but they sit in different places on the line.

Use subscript for chemical formulas (H₂O, CO₂), some mathematical notation, and footnote anchors in some styles. Use superscript for exponents (x²), trademark symbols (™), and footnote numbers in other styles. Word treats them as separate formatting options, so you can't accidentally turn one on when you meant the other.

To type superscript, use Ctrl + Shift + = on Windows or Cmd + Shift + = on Mac. The menu method is the same: go to Home, click the Font dialog arrow, and check Superscript instead of Subscript.

Removing subscript formatting

To remove subscript from text that already has it, select the text and press the subscript shortcut again (Ctrl + = on Windows, Cmd + = on Mac). The text returns to normal size and position. You can also select the text, open the Font dialog, and uncheck the Subscript box.

If you turned subscript on but haven't typed anything yet, pressing the shortcut again turns it off before you type. This is useful if you accidentally press the shortcut and realize you don't need subscript after all.

Word does not automatically remove subscript when you move to a new word or sentence. You have to turn it off manually, or the next text you type will also be subscript. This is by design — it lets you type multiple subscript words in a row without reactivating the formatting each time.

Common subscript uses in different fields

In chemistry and science writing, subscript appears in chemical formulas and molecular notation. H₂O, NaCl, and C₆H₁₂O₆ all use subscript numbers to show how many atoms of each element are in the molecule. If you write scientific documents regularly, learning the subscript shortcut saves time.

In mathematics, subscript identifies variables and sequences. You might write x₁, x₂, x₃ to show a series of values, or use subscript in matrix notation. Some mathematical symbols and Greek letters also use subscript in formal writing.

In formal writing and academic papers, subscript sometimes appears in footnote anchors, though many modern styles use superscript instead. Check your style guide (MLA, APA, Chicago) to see which one your field prefers. Word can handle both, so the choice is about following the rules for your document type, not about what Word can do.

Frequently Asked Questions

Why doesn't my subscript shortcut work?

Your keyboard layout or language settings might map the = key differently. Try using the menu method instead: Home tab, click the Font dialog arrow, and check Subscript. If you're on a laptop, you might need to hold Fn along with Ctrl and the = key. Check your laptop's keyboard guide if the standard shortcut doesn't work.

Can I make subscript text even smaller?

Word automatically sizes subscript text smaller than the surrounding text. You can't control the exact size through the subscript button itself. If you need more control, you can manually select subscript text and make it smaller using the font size dropdown, but this defeats the purpose of using the subscript feature, which is to keep sizing consistent.

Does subscript work the same way in all Microsoft Office programs?

Yes. Excel, PowerPoint, and Outlook all use the same keyboard shortcut (Ctrl + = on Windows, Cmd + = on Mac) and the same menu method. The process is identical across all Office programs, so once you learn it in Word, you can use it anywhere in the Office suite.

What if I need subscript in the middle of a word?

Type the word normally, then go back and select just the letters or numbers that need to be subscript. Press the subscript shortcut, and those characters will become subscript while the rest of the word stays normal. For example, to write H₂O, type "H2O", select just the "2", and press Ctrl + =.

Can I copy subscript formatting from one place to another?

Yes. Use the Format Painter tool in Word. Select text that already has subscript formatting, click the Format Painter button (the paintbrush icon on the Home tab), then click and drag to select the text you want to explore subscript to. This copies all formatting, including subscript, from the first selection to the second.