# Subscript Generator (₁₂₃)

URL: https://speedycalculator.com/calculators/other/subscript-generator/
Last updated: 2026-10-30

> The subscript generator converts text and numbers into Unicode subscript characters (H₂O, x₁, CO₂) that keep their position when pasted into chats, spreadsheets or social media. It also formats chemical formulas and x_1-style math automatically and shows the superscript version.

## Inputs

- Text to convert

## Results

- Subscript text
- Chemistry formatting (H2O → H₂O)
- Math formatting (x_1 → x₁)
- Superscript version
- Characters with no subscript form
- Characters

## Formula

```
Digits 0–9 → ₀–₉ (U+2080–U+2089) · + − = ( ) → ₊ ₋ ₌ ₍ ₎
Letters with subscript forms: a e h i j k l m n o p r s t u v x (and β γ ρ φ χ)
```

## Explanation

A subscript is a small character set slightly below the baseline. Chemists use it to count atoms (H₂O, C₆H₁₂O₆), mathematicians and programmers to index variables (x₁, aₙ), physicists to label quantities (v₀, Eₖ) and musicians once used figures below the bass line in figured-bass notation. In a word processor you get a subscript with a formatting button (Ctrl + = in Word, Ctrl + , in Google Docs), but that formatting disappears as soon as the text is copied into a plain-text field.

Unicode solves this with dedicated subscript characters. All ten digits and the signs + − = ( ) have subscript forms, but only 17 Latin letters do, because they were added for phonetic transcription rather than as a complete alphabet. Capital letters have no subscripts at all, so the generator uses the lowercase form where one exists.

Two smart outputs save time: “Chemistry formatting” subscripts only the digits that follow an element or bracket (CO2 → CO₂, while charges like 2+ become superscript), and “Math formatting” converts the underscore notation used in LaTeX and spreadsheets, x_1 or a_{n+1}, into x₁ and aₙ₊₁.

### How to use the Subscript Generator

- **Text to convert**

Everything is calculated in your browser, so results appear instantly and nothing you type is sent to a server.

### How it works

Every character is looked up in a subscript table; characters without a subscript form are left unchanged and listed. The chemistry output applies subscripts only to digits following a letter or closing bracket, and the math output only to characters after an underscore.

### Worked example

Input “H2O and CO2, x_1 + x_2”. The chemistry output is **H₂O and CO₂, x_1 + x_2** (only digits after element symbols change). The math output is **H2O and CO2, x₁ + x₂**. Converting every character gives ₕ₂ₒ ₐₙd Cₒ₂, ₓ_₁ ₊ ₓ_₂ – “d” and capital “C” have no subscript form and stay normal.

### Subscript characters

Normal0 1 2 3 4 5 6 7 8 9+ − = ( )a e o x ə h k l m n p s tSubscript₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉₊ ₋ ₌ ₍ ₎ₐ ₑ ₒ ₓ ₔ ₕ ₖ ₗ ₘ ₙ ₚ ₛ ₜ

## Worked example

Inputs — Text to convert: H2O and CO2, x_1 + x_2.

Results — **Subscript text = ₕ₂ₒ ₐₙd Cₒ₂, ₓ_₁ ₊ ₓ_₂**; Chemistry formatting (H2O → H₂O) = H₂O and CO₂, x_1 + x_2; Math formatting (x_1 → x₁) = H2O and CO2, x₁ + x₂; Superscript version = ᴴ²ᴼ ᵃⁿᵈ ᶜᴼ², ˣ_¹ ⁺ ˣ_²; Characters with no subscript form = d C , _; Characters = 22.

## Key terms

- **Subscript**: A small character placed below the baseline.
- **Baseline**: The line on which most letters sit.
- **Chemical formula**: Notation where subscripts count atoms, e.g. C₆H₁₂O₆.

## FAQ

**How do I type H₂O?**
Type H2O and copy the “Chemistry formatting” result, or use the subscript ₂ (U+2082) directly.

**Which letters can be subscript?**
Only a, e, h, i, j, k, l, m, n, o, p, r, s, t, u, v and x, plus Greek β, γ, ρ, φ and χ.

**Why are capital letters not converted?**
Unicode has no subscript capitals; the generator uses lowercase subscripts where available.

**How big is a subscript?**
Typically 55–65% of the normal font size, lowered by about a third of the x-height; Unicode characters follow whatever the font designer chose.

**What is the keyboard shortcut for subscript?**
Ctrl + = in Microsoft Word and Ctrl + , in Google Docs (⌘ + = and ⌘ + , on Mac).

**Can I use subscripts in Excel?**
Inside a cell you can format characters as subscript, but pasted Unicode subscripts are simpler and survive in formulas and charts.

**Are Unicode subscripts searchable?**
Not reliably – a search for “CO2” will not find “CO₂”, so keep a plain version in metadata.


## Sources

- [The Unicode Standard – Superscripts and Subscripts (U+2070–U+209F)](https://www.unicode.org/charts/PDF/U2070.pdf)
- [IUPAC – Nomenclature of Inorganic Chemistry (Red Book, 2005)](https://iupac.org/what-we-do/books/redbook/)
- [The Unicode Standard – Phonetic Extensions (U+1D00–U+1D7F)](https://www.unicode.org/charts/PDF/U1D00.pdf)