Subscript in Excel uses the Format Cells dialog or keyboard shortcut

To type subscript in Excel, select the character or number you want to make smaller and lower, then either press Ctrl + = (on Windows) or Cmd + = (on Mac), or open the Format Cells dialog and check the Subscript box. Excel does not have a direct "type subscript" mode the way some word processors do — you format text after you type it.

The keyboard shortcut is fastest if you are working with single characters or short strings. The Format Cells dialog gives you more control and works better when you need to format multiple instances or want to see the change before you confirm it.

Key Takeaways

  • Select the text first, then apply subscript formatting — you cannot type subscript directly as you type.
  • Windows users press Ctrl + = and Mac users press Cmd + = to toggle subscript on and off.
  • The Format Cells dialog (Ctrl + 1 on Windows, Cmd + 1 on Mac) opens a Subscript checkbox under the Font tab.
  • Subscript only affects how text displays in the cell; the actual cell value and any formulas remain unchanged.
  • If the keyboard shortcut does not work, check that you are not in edit mode — press Escape first, select the cell, then try again.

Using the keyboard shortcut on Windows

On Windows, the fastest way is the keyboard shortcut. Click inside the cell or double-click to enter edit mode, then select the character or characters you want to make subscript by clicking and dragging or by holding Shift and pressing the arrow keys.

Once the text is selected, press Ctrl + = (Ctrl and the equals sign). The selected text will drop below the baseline and shrink. Press Ctrl + = again to toggle subscript off. If you are working in a cell that already contains text, you can select just the part you want to subscript — for example, in "H2O" you would select only the "2" and apply subscript to it.

Using the keyboard shortcut on Mac

Mac users follow the same steps but use Cmd + = instead of Ctrl + =. Select the text inside the cell, then press Cmd + = to apply subscript. Press it again to remove subscript formatting.

If Cmd + = does not work, check your keyboard settings — some Mac keyboards or keyboard layouts map the equals key differently. If that is the case, use the Format Cells dialog instead (see below).

Using the Format Cells dialog

If the keyboard shortcut does not work or you prefer a visual interface, use the Format Cells dialog. On Windows, press Ctrl + 1. On Mac, press Cmd + 1. You can also right-click the cell and choose Format Cells from the menu.

In the dialog, click the Font tab. Under Effects, you will see a Subscript checkbox. Check it and click OK. The selected text will become subscript. To remove subscript, open Format Cells again and uncheck the box.

What subscript does and does not change

Subscript is purely a display format. If a cell contains the text "H2O" and you make the "2" subscript, the cell still contains "H2O" — the underlying value does not change. If you reference that cell in a formula, the formula sees the full text, not a formatted version of it.

This matters if you are using subscript in chemical formulas, mathematical notation, or footnote references. The subscript formatting is visual only and will not affect calculations, sorting, or how other cells read the value.

Subscript in formulas and merged cells

You can apply subscript to text inside a formula result. For example, if a formula returns "x1" and you want the "1" to be subscript, select the cell, enter edit mode, select the "1", and apply subscript. The formula itself is not affected — only the display of the result changes.

In merged cells, subscript works the same way. Select the merged cell, enter edit mode, select the text you want to subscript, and apply the formatting. Subscript does not affect how merged cells behave or how they align.

Frequently Asked Questions

Can I type subscript while I am typing, or do I have to format after?

You must format after you type. Excel does not have a mode to type subscript directly. Type the text first, select the character you want to subscript, then apply the formatting using the keyboard shortcut or Format Cells dialog.

Does subscript work in Excel formulas?

Subscript formatting does not affect how formulas work. If you apply subscript to text in a cell, formulas that reference that cell still see the full text value. Subscript is only a visual change to how the text appears on screen.

What if the keyboard shortcut does not work?

Make sure you are not in edit mode — press Escape first to exit edit mode, select the cell, and try the shortcut again. If it still does not work, use the Format Cells dialog instead. On some keyboards or regional layouts, the equals key may be mapped differently.

Can I copy subscript formatting to other cells?

Yes. Select a cell with subscript formatting, press Ctrl + C (or Cmd + C on Mac) to copy, select the cells where you want the same formatting, then press Ctrl + V (or Cmd + V). The subscript formatting will copy along with the text.

Does subscript change the cell height or row height?

No. Subscript text is smaller and positioned lower, but it does not automatically change the row height. If subscript text appears cut off, you can manually increase the row height by dragging the row border or by right-clicking the row and selecting Row Height.