SymbolHub

Ohm Symbol (Ω)

The ohm symbol Ω is Unicode U+2126, the SI derived unit symbol of electrical resistance, impedance and reactance named after Georg Simon Ohm. Press Copy to put it on your clipboard.

Unicode
U+2126
HTML
Ω
Word
2126 Alt+X

How to type the ohm symbol (Ω)

The quickest way is to press Copy above and paste. To type Ω yourself, use the method for your device below.

Windows

  1. In Word or Outlook, type 2126 and press Alt + X. Alt + X converts the hex code before the cursor into the character, and back again.
  2. Press Win + R, type charmap and press Enter. Tick “Advanced view”, search for Ohm Sign, then Select and Copy. Character Map is built into every version of Windows.

Mac

  1. Press Control + Command + Space to open the Character Viewer, search for ohm and double-click it.
  2. With the Unicode Hex Input keyboard enabled (System Settings → Keyboard → Input Sources), hold Option and type 2126.

Linux & ChromeOS

  1. Press Ctrl + Shift + U, type 2126, then press Enter or Space. Works in GTK and IBus apps (GNOME, Firefox, Chrome, LibreOffice) and on ChromeOS.

iPhone & iPad

  1. Copy Ω from this page, then go to Settings → General → Keyboard → Text Replacement and add it with a shortcut such as ;ohm. The shortcut then turns into the symbol as you type, in every app.

Android

  1. Copy Ω here, then open Gboard settings → Dictionary → Personal dictionary and add it with a shortcut.

Microsoft Word

  1. Type 2126, then press Alt + X.
  2. Insert → Symbol → More Symbols. Set “from” to Unicode (hex), type 2126 in “Character code” and click Insert.

Google Docs

  1. Insert → Special characters, then search for “ohm” or draw it in the box.

Excel & Google Sheets

  1. Enter =UNICHAR(8486) in a cell. It works in Excel 2013 and later and in Google Sheets.

HTML

  1. Write Ω or Ω in your HTML.

What does Ω mean?

The ohm symbol (Unicode name OHM SIGN, U+2126) is the derived SI unit of electrical resistance, impedance, and reactance, named in honor of the German physicist Georg Simon Ohm. One ohm represents the electrical resistance between two points of a conductor when a constant potential difference of one volt produces a current of one ampere. Typographically, the ohm sign is visually identical to the Greek capital letter omega. In Unicode, U+2126 was included for legacy compatibility with older character sets, but the Unicode Consortium explicitly recommends using the standard Greek capital letter omega (U+03A9) in all new text because the two are canonically equivalent. Engineers frequently pair the ohm symbol with metric prefixes like the micro sign µ, kilo, and mega, making it essential within technical unit symbols, Greek letters, and scientific math symbols.

Common uses

  • Electronic circuit diagrams and resistor values: 4.7 kΩ or 100 Ω
  • Audio speaker impedance specifications: 8 Ω nominal impedance
  • Multimeter electrical test measurements and component datasheets
  • Physics problem sets formulating Ohm’s law calculations (V = I * R)

Ohm Symbol codes for HTML, CSS and programming

Every code below produces Ω. Use the HTML entity in web pages, the CSS escape in content, and the escape sequence in source code.

Unicode code pointU+2126
HTML decimalΩ
HTML hexΩ
CSS contentcontent: "\2126";
JavaScript"\u2126"
Python"\u2126"
Python (by name)"\N{OHM SIGN}"
Java / C#"\u2126"
UTF-8 bytesE2 84 A6
UTF-162126
URL encoded%E2%84%A6

Ω vs look-alike characters

These characters look similar to Ω but have a different meaning and code. Pasting the wrong one can break search, sorting and screen readers.

CharNameWhen to use it
Greek capital Omega
U+03A9		Greek capital letter Omega (U+03A9), canonically equivalent to the ohm sign and preferred by Unicode.
Inverted Ohm
U+2127		Inverted ohm sign or mho (U+2127), historical unit for electrical conductance.
Greek Omega
U+03C9		Greek small letter omega (U+03C9), used for angular frequency in physics.

Symbols similar to Ω

Click to copy, or open a symbol for its codes.

Ω character properties

Official Unicode name
OHM SIGN
Also known as
ohm sign, electrical resistance symbol, omega symbol, ohms
Code point
U+2126
Unicode block
Letterlike Symbols (U+2100–U+214F)
General category
Uppercase letter (Lu)
Added in
Unicode 1.1 (1993)
Plane
Basic Multilingual Plane (0)
Emoji
No, it is a text symbol

Frequently asked questions

Should I use U+2126 (OHM SIGN) or U+03A9 (GREEK CAPITAL LETTER OMEGA)?

The Unicode Consortium recommends using U+03A9 (Greek capital letter omega). Unicode normalizes U+2126 to U+03A9 under canonical decomposition (NFD and NFC).

What is Ohm’s law?

Ohm’s law states that current (I) through a conductor between two points is directly proportional to voltage (V) and inversely proportional to resistance (R), written as V = I * R.

What does an ohm measure?

An ohm measures electrical resistance—the opposition that a circuit component presents to the passage of an electric current.

Is there an alt code for the ohm symbol?

No. Ω is outside the Windows-1252 and code page 437 character sets, so no Alt + number code produces it. Copy it from this page, type 2126 then Alt + X in Word, or find it in Character Map.

How do I type the ohm symbol on a Mac?

There is no single Option shortcut for Ω on the US layout. Press Control + Command + Space to open the Character Viewer, search for “ohm” and double-click it, or copy it from this page.

What is the HTML code for the ohm symbol?

Ω has no named HTML entity. Use the numeric reference Ω or Ω, or paste the character directly into a UTF-8 page.

What is the Unicode for the ohm symbol?

Ω is U+2126, officially named OHM SIGN, in the Letterlike Symbols block. It has been part of Unicode since version 1.1 (1993).