What subscript is and when you need it

Subscript is text that sits below the baseline of regular text — like the "2" in H₂O or the "n" in mathematical formulas. In Microsoft Office (Word, Excel, PowerPoint), you can format text as subscript using a keyboard shortcut instead of hunting through menus.

You'll use subscript most often in scientific writing, chemistry notation, mathematical equations, and footnote references. Once you know the shortcut, it takes a fraction of a second to apply.

Key Takeaways

  • In Word, Excel, and PowerPoint on Windows, select the text and press Ctrl + Equal (=) to make it subscript.
  • On Mac, select the text and press Command + Control + B to make it subscript.
  • You can toggle subscript on and off by pressing the same shortcut again while the text is selected.
  • Subscript works on individual characters, words, or entire phrases — select whatever you want to format.
  • The shortcut works the same way in all three main Office applications.

Windows keyboard shortcut for subscript

On Windows, select the text you want to make subscript, then press Ctrl + Equal (=). The equal sign is on the same key as the plus sign, so you do not need to hold Shift.

The text will shrink and drop below the baseline immediately. If you want to undo it, select the text again and press Ctrl + Equal a second time — the shortcut toggles subscript on and off.

This shortcut works in Word, Excel, and PowerPoint. It also works in Outlook when you are composing a message in rich text format (not plain text).

Mac keyboard shortcut for subscript

On Mac, select the text you want to make subscript, then press Command + Control + B. Hold all three keys at once — Command, Control, and B.

The text will format as subscript the same way it does on Windows. Press the same combination again to toggle it off. This shortcut works across Word, Excel, and PowerPoint on Mac.

How to select text before applying the shortcut

You can make subscript from a single character up to an entire phrase. Click at the start of what you want to format, then drag to the end to highlight it. You can also click once, hold Shift, and click at the end of the text you want to select.

If you are typing and want the next character to be subscript, you can press the shortcut before you type — it will turn subscript mode on. Type the character or number, then press the shortcut again to turn subscript mode off and return to normal text.

Subscript versus superscript

Superscript is the opposite — text that sits above the baseline, like the "2" in x² or footnote numbers. On Windows, use Ctrl + Shift + Plus (+) for superscript. On Mac, use Command + Shift + Plus (+).

Both shortcuts work the same way: select the text, press the shortcut, and press it again to toggle off. The only difference is whether the text moves up (superscript) or down (subscript).

Troubleshooting when the shortcut does not work

If Ctrl + Equal does not work on Windows, check that you are using the equal sign on the main keyboard, not the one on the numeric keypad. The numeric keypad version may not trigger the subscript formatting in all Office versions.

If you are in a text box or a cell that is in edit mode, the shortcut may not work — press Escape to exit edit mode first, then select the text and try again. In Excel, make sure you are not actively typing inside a cell; click outside the cell, select it, and use the shortcut on the cell content itself.

If the shortcut still does not respond, your Office installation may have a conflicting keyboard setting. You can always use the menu instead: in Word, go to Home > Format > Text > Subscript. In Excel and PowerPoint, right-click the selected text and choose Font, then check the Subscript box.

When to use subscript in your documents

Subscript is standard in scientific and technical writing. Use it for chemical formulas (H₂SO₄), mathematical variables with indices (x₁, x₂), and biological notation. In some style guides, subscript is also used for footnote and endnote markers, though Word can handle those automatically.

In business or general writing, subscript is less common but still useful for product names or technical terms that include subscripted characters. The keyboard shortcut makes it fast enough that there is no reason to avoid it when your document calls for it.

Frequently Asked Questions

Can I make subscript text a different size or color?

Yes. After you apply subscript formatting, you can select the text again and change its font size, color, or style just like any other text. Subscript is a formatting layer that sits on top of other text properties, so you can combine them however you need.

Does subscript work in Excel formulas?

Subscript formatting works on text and labels in Excel cells, but not inside formulas themselves. If you want to display a subscripted result (like showing x₂ as the output of a calculation), format the cell after the formula is complete.

Will subscript text print correctly?

Yes. Subscript formatting prints exactly as it appears on screen. When you print or export to PDF, the subscripted text will remain below the baseline and at the reduced size.

Can I create a custom keyboard shortcut for subscript?

In Word, you can customize keyboard shortcuts through File > Options > Customize Ribbon > Keyboard Shortcuts. However, the built-in Ctrl + Equal (Windows) and Command + Control + B (Mac) shortcuts are already the fastest option available.

What if I need subscript in a different program, like Google Docs?

Google Docs uses different shortcuts: Ctrl + Comma (,) on Windows and Command + Comma (,) on Mac. The process is the same — select the text and press the shortcut — but the key combination is different from Office.