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How to Format Chemical Formulas and Units in Academic Reports

Examples of correctly formatted chemical formulas and units, such as H2O and square meters

A surprising number of project reports lose marks on something that has nothing to do with the actual chemistry: formulas and units typed as plain text instead of properly formatted subscripts and superscripts.

The core rule

Chemical formulas use subscripts for the number of atoms: H₂O, not H2O. Powers and some units use superscripts: m², not m2. These aren't stylistic preferences -- they're standard scientific notation, and a report that skips them reads as careless even when the underlying content is correct.

How to actually do it in Word

  • Subscript: select the character, then Ctrl+= (Windows) or the subscript button under Font in the Home ribbon.
  • Superscript: select the character, then Ctrl+Shift+= (Windows) or the superscript button next to it.
  • Don't just reduce font size. A smaller-sized "2" placed slightly lower is not a true subscript -- it won't be recognized correctly if the document is later converted, read by assistive technology, or searched.

Common formulas and units to get right

Written incorrectly Correct
H2O H₂O
CO2 CO₂
m2 (for area)
m3 (for volume)
25 degC 25°C
Fe2O3 Fe₂O₃

Where this fits into your broader formatting

This is a small detail, but it's part of the same pattern as every other formatting inconsistency: reviewers read a report differently once they notice one type of carelessness, and start looking harder for others. Getting subscripts and superscripts right costs almost no extra time and removes one more reason for a document to look unpolished.

Where UniDraft fits in

UniDraft handles chemical formulas, units, and other scientific notation automatically wherever your content includes them -- rendering true subscripts and superscripts, not approximations, regardless of which discipline your document is for.

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Frequently asked questions

How do I type a subscript like H2O correctly in Word?

Select the number, then use Word's subscript formatting (Ctrl+= on Windows, or the subscript button in the Font section of the Home tab) rather than just typing a smaller-sized number, which isn't a true subscript and won't be recognized as one by reference managers or accessibility tools.

Should units like m² be typed with a superscript 2 or the Unicode character ²?

A true superscript (formatted via Word's superscript function) is generally preferred over a Unicode superscript character, since it's more reliably preserved across different fonts, PDF conversion, and printing. Unicode superscript characters can render inconsistently depending on the font.

Do chemical formula formatting rules differ by department?

The subscript/superscript convention itself is a general typographic rule, not department-specific -- but check whether your department has a preferred style for reporting units (e.g. 'mg/L' vs 'mg L⁻¹') since that does vary by discipline and sometimes by specific department guideline.