Subscript in Excel uses the Format Cells dialog or keyboard shortcut

To add subscript to text in Excel, select the characters you want to make smaller and lower, then either press Ctrl + = (Windows) or Cmd + = (Mac), or open Format Cells and check the Subscript box. Excel will shrink the selected text and move it below the baseline of the regular text. This works in any cell where you are typing text or numbers.

Subscript is useful when you need to write chemical formulas (like H₂O), mathematical notation, or footnote references within a cell. Unlike superscript, which raises text above the line, subscript pulls it below — the opposite direction.

Key Takeaways

  • The keyboard shortcut Ctrl + = (Windows) or Cmd + = (Mac) applies subscript to selected text without opening any menu.
  • You can also right-click selected text, choose Format Cells, go to the Font tab, and check the Subscript box.
  • Subscript only works on text within a single cell — you cannot apply it to an entire column or row at once.
  • Once you apply subscript, you can remove it by selecting the text again and pressing the same keyboard shortcut a second time.

Using the keyboard shortcut (fastest method)

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

Once the text is selected, press Ctrl + = on Windows or Cmd + = on Mac. The selected characters will immediately shrink and drop below the baseline. If you need to remove subscript from the same text, select it again and press the shortcut a second time — it toggles on and off.

Using the Format Cells dialog

If the keyboard shortcut does not work on your keyboard layout or you prefer using menus, the Format Cells dialog gives you the same option. Double-click the cell to enter edit mode, then select the text you want to format by clicking and dragging.

Right-click the selected text and choose Format Cells from the menu. In the dialog that opens, click the Font tab. You will see a section called Effects with two checkboxes: Superscript and Subscript. Check the Subscript box and click OK. The text will format immediately.

You can also reach Format Cells by pressing Ctrl + 1 (Windows) or Cmd + 1 (Mac) after selecting your text, which skips the right-click step.

When subscript works and when it does not

Subscript works on any text or number inside a cell, whether the cell contains only subscript text or a mix of regular and subscript characters. You can have "H₂O" in one cell and "CO₂" in another, and each will display correctly.

Subscript does not work on entire rows, columns, or cell references — only on the actual text content inside cells. If you copy a cell with subscript formatting to another cell, the subscript formatting copies with it. However, if you paste only the value (using Paste Special > Values), the formatting is lost and you will need to reapply it.

Subscript in formulas and cell references

You cannot apply subscript to a formula or to a cell reference like A1 or B2. Subscript only formats the text that appears in the cell, not the underlying data or calculations. If you type a formula like =A1+A2, you cannot make the "1" or "2" subscript because those are part of the cell address, not display text.

If you need subscript in a formula result, you must type the text directly into the cell rather than using a formula. For example, to display "H₂O" you would type it as text, not create it with a formula. Once typed, you can then select the "2" and apply subscript formatting.

Combining subscript with other formatting

Subscript works alongside other text formatting in Excel. You can make subscript text bold, italic, or a different color by selecting it and applying those formats in addition to subscript. The text will remain subscript while also displaying the other formatting you chose.

If you select text that is already bold and apply subscript, it stays bold and becomes subscript. You can layer these formats without them interfering with each other. To remove subscript while keeping the other formatting, select the text and toggle subscript off using the keyboard shortcut or Format Cells dialog.

Frequently Asked Questions

Can I make multiple separate parts of a cell subscript?

Yes. You can select one character or group of characters, apply subscript, then select a different part of the same cell and apply subscript to that too. Each selection is formatted independently, so you can have "H₂O and CO₂" in one cell with both numbers subscript.

Does subscript work in Excel formulas?

No. Subscript only formats text that displays in the cell. If you write a formula, the formula itself cannot be subscript. You can only apply subscript to text you type directly into a cell, not to the results of calculations or cell references.

What if the keyboard shortcut does not work?

Some keyboard layouts or regional settings may not recognize Ctrl + =. Use the Format Cells method instead: right-click selected text, choose Format Cells, click the Font tab, and check Subscript. This works on all versions of Excel regardless of keyboard layout.

Does subscript print the same way it appears on screen?

Yes. When you print an Excel sheet, subscript text prints in the same reduced size and lower position as it appears on your screen. The formatting carries through to the printed page.