How do you type CO₂ and H₂O with subscript?
Quick answer: Type CO2 or H2O in the formula converter, turn on Formula + Numbers Only, copy CO₂ or H₂O, and paste into Word, Docs, or slides. The lowered 2 is a real Unicode character (U+2082), not a Word-only style that chat apps drop.
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H2O CO2 copy paste works when the lowered 2 is a real character, not a smaller font. Word’s Format → Subscript looks fine on that page, then often breaks in chat. Unicode keeps the digit below the line after paste (see the U2070 digit chart).
Three steps for a worksheet or chat
| Step | What to Do |
|---|---|
| 1 | Open the converter and type your formula (for example CO2 or H2O). |
| 2 | Select Subscript, turn on Formula mode and Numbers Only: On, then click Copy. |
| 3 | Paste the result (CO₂ or H₂O) into Word, PowerPoint, Google Docs, or your email editor. |
One-click chemistry formulas for worksheets and chat
Tap a cell in the Copy this column. These chemistry formulas cover eight compounds classes actually use, not only water and carbon dioxide.
| Compound | Type this | Copy this |
|---|---|---|
| Water | H2O | H₂O |
| Carbon dioxide | CO2 | CO₂ |
| Methane | CH4 | CH₄ |
| Ammonia | NH3 | NH₃ |
| Sulfuric acid | H2SO4 | H₂SO₄ |
| Glucose | C6H12O6 | C₆H₁₂O₆ |
| Sodium chloride | NaCl | NaCl |
| Oxygen gas | O2 | O₂ |
NaCl has no lowered digits, but students often mix it with ion charges (Na⁺ uses a raised mark). For a custom string, type the plain version in the converter with Formula + Numbers Only so you do not hunt for each digit.
What if a letter has no Unicode subscript?
Digits 0 to 9 all exist as lowered characters. Many Latin letters do not. Keep element symbols normal and lower only the counts. If you need a rare letter index, check which lowered letters Unicode actually has before you search for a missing glyph.
Need one digit alone? Use the lowered digit board with U+ codes.
Quick answers
How do I type CO₂ with subscript? Type CO2 in the free converter, turn on Formula mode and Numbers Only, copy CO₂, and paste into Word, Docs, slides, or chat.
How do I write H₂O with subscript numbers? Type H2O with Formula + Numbers Only, copy H₂O, and paste. The ₂ is a real Unicode character, not Word-only formatting.
What if a letter has no Unicode subscript? Many Latin letters have no lowered form. Keep the letter normal and lower only the digits, or check the letter chart for the few glyphs that exist.
Ready for class or chat
For quick H2O CO2 copy paste, tap a formula on this page or build a longer string in the converter. One copy; paste where you need it.