Subscript formatting makes numbers or letters appear smaller and lower than regular text

In Excel, subscript is a character format that shrinks text and positions it below the baseline of regular text. It's useful for chemical formulas (H₂O), mathematical notation, footnote markers, or any text that needs to sit lower on the line. Excel offers three ways to apply subscript: through the Format menu, through a keyboard shortcut, or through the Format Cells dialog.

The fastest method depends on whether you're formatting a single character or multiple characters, and whether you want to do it repeatedly in the same spreadsheet.

Key Takeaways

  • Select the specific character or number you want to make subscript before applying any format — subscript applies only to what you've selected, not the whole cell.
  • The keyboard shortcut Ctrl+= (on Windows) or Cmd+= (on Mac) toggles subscript on and off for selected text.
  • You can also right-click selected text, choose Format Cells, go to the Font tab, and check the Subscript box.
  • Subscript formatting works in both the cell itself and in the formula bar when you're editing a cell.
  • If subscript doesn't appear to work, make sure you've selected text within the cell first — you must be in edit mode, not just have the cell selected.

Using the keyboard shortcut for subscript

The quickest method is the keyboard shortcut. First, click inside the cell where your text is, or double-click the cell to enter edit mode. Then highlight only the character or characters you want to make subscript by clicking and dragging across them.

On Windows, press Ctrl+= (Ctrl and the equals sign). On Mac, press Cmd+= (Command and the equals sign). The selected text will shrink and drop below the line. Press the same keys again to remove subscript formatting from that text.

This method works whether you're typing new text or editing existing text in a cell. The subscript stays in place even after you press Enter and move to another cell.

Using the Format Cells dialog

If the keyboard shortcut doesn't work on your keyboard layout, or if you prefer using menus, you can access subscript through the Format Cells dialog. First, select the text you want to format by clicking inside the cell and dragging across the characters.

Right-click the selected text and choose Format Cells from the menu. The Format Cells dialog will open. Click the Font tab if it's not already active. In the Effects section, check the box next to Subscript. Click OK. The text will immediately drop below the baseline and shrink.

You can also reach this dialog by pressing Ctrl+1 (Windows) or Cmd+1 (Mac) after selecting your text, which bypasses the right-click menu.

Entering subscript while typing new text

You don't have to type all your text first and then format it. You can apply subscript as you type. Double-click the cell to enter edit mode. Type the text that should appear in regular size. Then press Ctrl+= (or Cmd+= on Mac) to turn subscript on. Type the character or number that should be subscript. Press Ctrl+= again to turn subscript off. Continue typing any remaining regular text.

This method is efficient if you know in advance where subscript will appear — for example, if you're entering a list of chemical formulas or mathematical expressions.

Removing subscript formatting

To remove subscript from text, select the subscripted characters and press Ctrl+= (Windows) or Cmd+= (Mac) again. The text will return to regular size and position. Alternatively, select the text, right-click, choose Format Cells, click the Font tab, uncheck Subscript, and click OK.

If you want to remove subscript from multiple cells at once, select all the cells, then use Format Cells to uncheck Subscript for the entire selection. This removes subscript formatting from any text in those cells that has it applied.

Subscript vs. superscript and when to use each

Superscript is the opposite of subscript — text appears smaller and raised above the baseline. Use superscript for exponents (x²), trademark symbols (™), or footnote numbers. Use subscript for chemical formulas, mathematical subscripts, or any notation that sits below the line. Excel applies these formats independently, so you can have both subscript and superscript in the same cell if needed.

The keyboard shortcut for superscript is Ctrl+Shift+= (Windows) or Cmd+Shift+= (Mac). The Format Cells dialog has a separate Superscript checkbox right next to Subscript.

Troubleshooting subscript that doesn't appear

If you apply subscript formatting and the text doesn't change, the most common cause is that you selected the cell but didn't enter edit mode. You must double-click the cell or press F2 to enter edit mode, then select the specific text within that cell. Subscript formatting only works on text you've selected while editing the cell contents.

Another possibility is that your font doesn't support subscript. Most standard fonts (Arial, Calibri, Times New Roman) do, but some decorative or specialty fonts may not render subscript correctly. If subscript text looks wrong or doesn't appear, try changing the font to Calibri or Arial and applying subscript again.

Frequently Asked Questions

Can I make subscript permanent so it applies automatically to certain text?

No, subscript is a manual format you apply to each instance. However, if you use the same subscript text repeatedly, you can copy a cell that already has subscript formatting and paste it into new cells. The formatting will copy along with the text.

Does subscript formatting work in Excel formulas?

Subscript is a display format only and does not affect how Excel calculates formulas. If you type subscript text in a cell that contains a formula, the formula still works normally. Subscript only changes how the text looks, not what it means to Excel.

Will subscript text print correctly?

Yes, subscript formatting prints exactly as it appears on screen. When you print the spreadsheet, subscript text will be smaller and positioned below the baseline just as you see it in the cell.

Can I apply subscript to an entire column or row at once?

No, subscript must be applied to specific characters within cells, not to whole cells or ranges. You must select the text character by character. If you need subscript in many cells, copy a cell with subscript formatting and paste it into the other cells.