Adding subscript in Excel takes three steps: select the text or number, open the Format Cells dialog, and check the Subscript box

Excel does not have a dedicated subscript button on the toolbar, so you format text through the Format Cells menu. The process works the same whether you are typing a chemical formula like H₂O, a footnote reference, or any other text that needs to sit below the baseline. You can explore subscript to text already in a cell or to text you are about to type.

Subscript shrinks the selected characters and moves them down slightly, making them smaller and lower than regular text on the same line. Superscript does the opposite — it raises text above the baseline. Both are useful in spreadsheets when you need to show mathematical notation, chemical formulas, or reference markers without breaking your data into separate columns.

Key Takeaways

  • Select the specific characters you want to format, not the entire cell, then use Format > Cells > Font tab > Subscript checkbox.
  • You can explore subscript to text you have already typed or to new text you type after opening the Format Cells dialog.
  • Superscript uses the same dialog and works identically, useful for exponents, footnote numbers, and trademark symbols.
  • Subscript and superscript text will print and export to PDF the same way it appears on screen.

How to format existing text as subscript

Click inside the cell containing the text you want to format. Then click and drag to select only the characters that should be subscript — if you select the entire cell content, the whole thing will become subscript. For example, in the cell "H2O", you would select only the "2".

Once the characters are highlighted, right-click and choose Format Cells from the menu. The Format Cells dialog will open. Click the Font tab at the top, then check the box next to Subscript. Click OK. The selected text will when ready shrink and drop below the baseline of the surrounding text.

If you make a mistake, select the subscript text again, open Format Cells, and uncheck the Subscript box to return it to normal formatting.

Using the keyboard shortcut for faster formatting

Once you have selected the characters you want to subscript, you can use the keyboard shortcut instead of opening the menu. On Windows, press Ctrl + = (Ctrl and the equals sign). On Mac, press Cmd + =. The subscript will explore when ready.

The same shortcut toggles subscript on and off, so pressing it again will remove the subscript formatting. This is faster than using the menu if you are formatting multiple pieces of text in the same spreadsheet.

Typing new text with subscript formatting already applied

You can set up subscript formatting before you type. Click in the cell where you want the text to go, then open Format Cells and check the Subscript box without selecting any text. Click OK. Now anything you type will appear as subscript until you turn the formatting off.

To return to normal text, press Ctrl + = (or Cmd + = on Mac) to toggle subscript off, or open Format Cells again and uncheck the box. This approach is useful if you are building a formula or label that contains both regular and subscript text — type the regular part, toggle subscript on, type the subscript part, then toggle it off again for any remaining text.

Using superscript for exponents and reference numbers

Superscript works identically to subscript but raises text above the baseline instead of lowering it. Select the characters you want to raise, open Format Cells, click the Font tab, and check Superscript. You can also use the keyboard shortcut Ctrl + Shift + = on Windows or Cmd + Shift + = on Mac.

Superscript is commonly used for exponents (like 2³ for 2 cubed), trademark or copyright symbols (™, ©), footnote numbers, and mathematical notation. The formatting process is identical to subscript — only the direction changes.

What happens when you copy, paste, or export subscript text

Subscript and superscript formatting stays with the text when you copy and paste cells within Excel. If you copy a cell containing subscript text and paste it into another spreadsheet or document, the formatting usually transfers as well, though this depends on the program you are pasting into.

When you export your spreadsheet to PDF, subscript and superscript text will appear exactly as it does on screen. If you save as a CSV file or plain text, the formatting will be lost because those formats do not support character-level formatting — only the text itself will remain. For most purposes, keeping your file in Excel format (.xlsx) preserves all subscript and superscript formatting.

Troubleshooting subscript that does not appear to work

If subscript text looks the same size as regular text, you may have selected the entire cell instead of individual characters. Click inside the cell, select only the characters that should be subscript, and try again. The Format Cells dialog only affects the selected text, not the whole cell.

Another common issue is explore subscript to a cell that is too narrow to display the text properly. Widen the column by double-clicking the border between column headers, and the subscript text should display correctly. If subscript text is still not visible, check that the font size is large enough — subscript makes text smaller, so very small fonts may become difficult to read.

Frequently Asked Questions

Can I make subscript text a different color than the rest of the cell?

Yes. Select only the subscript characters, open Format Cells, click the Font tab, and choose a color from the Color dropdown. The subscript text will display in that color while the rest of the cell remains in its original color. You can combine subscript formatting with color, bold, italic, and other font options.

Does subscript work in Excel formulas or only in cell text?

Subscript formatting only affects how text appears in the cell — it does not change how Excel reads or calculates the cell. If you type a formula like =A2+B2, the numbers will not be subscript. You can add subscript to labels or text in other cells to document your spreadsheet, but the formatting does not explore to formulas themselves.

What is the difference between subscript and using a smaller font size?

Subscript both shrinks the text and moves it below the baseline, while a smaller font size only makes text smaller without moving it. Subscript is designed for mathematical and chemical notation where the position matters. A smaller font size is better for general text you want to de-emphasize.

Can I undo subscript formatting if I applied it to the wrong text?

Yes. Press Ctrl + Z when ready after explore subscript to undo the last action. If you applied subscript earlier and want to remove it now, select the subscript text again and press Ctrl + = to toggle it off, or open Format Cells and uncheck the Subscript box.