Adapter or Adaptor: Which Spelling Is Correct?

Adapter and adaptor are both correct words, but adapter is the more common and preferred spelling in most modern English.

Use adapter when you mean a device that helps one thing connect to another, such as a phone charger, plug, cable, or computer accessory.

Examples:

• I need a travel adapter for my charger.
• The laptop came with a power adapter.
• This USB adapter connects to the keyboard.
• She packed a plug adapter for her trip.

Adaptor is a less common variant. It is sometimes used, especially in British English, but adapter is usually the safer choice for everyday writing.

Quick Answer

Use adapter in most situations.

Adaptor is a variant spelling, but it is less common.

Best choice:

• I bought a new phone adapter.

Also possible, but less common:

• I bought a new phone adaptor.

If you are writing for a general audience, product page, tech guide, school paper, or article, choose adapter.

What Does Adapter Mean?

An adapter is something that makes two different things work together.

Most often, an adapter is a small device used to connect equipment that would not otherwise fit or communicate.

Examples:

• a power adapter
• a USB adapter
• a plug adapter
• a travel adapter
• a headphone adapter
• a network adapter
• an HDMI adapter

Example sentences:

• The phone needs a charging adapter.
• The camera uses a memory card adapter.
• I forgot my travel adapter at home.
• This adapter lets you connect old headphones to a new phone.

In simple terms, an adapter helps one thing fit, connect, or work with another thing.

What Does Adaptor Mean?

Adaptor means the same thing as adapter, but it is less common.

Examples:

• The device includes a plug adaptor.
• You may need a travel adaptor in Europe.
• The old cable requires an adaptor.

These sentences are understandable, especially to readers who are used to British spelling. However, many readers now expect adapter, especially in technology and product writing.

So while adaptor is not usually wrong, adapter is more widely recognized.

Adapter vs Adaptor: The Main Difference

The main difference is spelling preference.

Adapter = more common, standard modern spelling
Adaptor = less common variant spelling

They usually mean the same thing.

Compare:

• This charger needs an adapter.
• This charger needs an adaptor.

Both sentences can mean the same thing, but the first spelling is more common and usually looks more natural.

For most writing, adapter is the better default.

Is Adaptor Wrong?

No, adaptor is not completely wrong.

It is a real spelling variant. You may see it in British English, older writing, product descriptions, or company materials.

However, it is less common than adapter. In many contexts, especially technology, adapter is the spelling readers expect.

Better for most writing:

• wireless adapter
• power adapter
• travel adapter
• network adapter

Less common:

• wireless adaptor
• power adaptor
• travel adaptor
• network adaptor

If you want your writing to look clean and current, use adapter.

Is Adapter American English?

Adapter is especially common in American English, but it is also widely used in British English and international English.

This is why adapter is usually the safest spelling for global readers.

For example:

• power adapter
• plug adapter
• USB adapter

These spellings are familiar across many English-speaking regions.

Adaptor may still appear, but adapter is more common in modern usage.

Adapter as a Device

The most common use of adapter is for a physical device.

Examples:

• The wall adapter is missing.
• I need a USB-C adapter.
• The charger came with a small adapter.
• The travel adapter works in several countries.

This is the spelling most people expect in technology, electronics, travel, and product writing.

If your article is about plugs, cables, chargers, ports, or devices, use adapter.

Adapter as a Person or Thing That Adapts

Adapter can also mean a person or thing that adapts something.

For example, a writer who changes a book into a movie script may be called an adapter.

Examples:

• The screenwriter was the adapter of the novel.
• She is a skilled adapter of classic stories.
• The play’s adapter changed the ending.

This use is less common than the device meaning, but the spelling adapter still works.

How to Remember the Correct Spelling

A simple memory trick:

Adapter has “adapt” inside it.

Look at the spelling:

adapt + er = adapter

That makes the spelling easy to remember.

An adapter helps something adapt to something else.

Examples:

• A plug adapter helps a plug adapt to a different outlet.
• A cable adapter helps one cable adapt to another port.
• A screen adapter helps a story adapt to a new format.

So remember:

adapt → adapter

That is the clearest spelling pattern.

Spelling Structure

Adapter is spelled:

a-d-a-p-t-e-r

It ends in -er.

Adaptor is spelled:

a-d-a-p-t-o-r

It ends in -or.

The key difference is the ending:

adapter = -er
adaptor = -or

For most modern writing, choose the -er ending:

adapter

Common Mistakes

Mistake 1: Thinking adaptor is always wrong

Adaptor is a real variant, so it is not always wrong.

However, it is less common. If you are not sure which spelling to use, choose adapter.

Mistake 2: Mixing both spellings in one article

Inconsistent:

• I bought a travel adapter, but the plug adaptor broke.

Better:

• I bought a travel adapter, but the plug adapter broke.

Choose one spelling and stay consistent. The best choice is usually adapter.

Mistake 3: Using adapter when you mean adopter

Be careful not to confuse adapter with adopter.

An adapter helps something connect or change.

An adopter is a person who adopts something or someone.

Examples:

• The phone needs an adapter.
• She is an early adopter of new technology.

These words look similar, but they are different.

Example Sentences With Adapter

• I need a power adapter for my laptop.
• The travel adapter fits several outlet types.
• This adapter connects HDMI to USB-C.
• The charger includes a wall adapter.
• He forgot his headphone adapter.
• The wireless adapter improved the internet connection.
• The screenwriter was the adapter of the novel.

Example Sentences With Adaptor

• The box included a plug adaptor.
• She bought a travel adaptor before flying overseas.
• The old device needed a special adaptor.

These examples are understandable, but adapter is still the more common spelling.

Final Answer: Adapter or Adaptor?

Adapter and adaptor are both correct, but adapter is the more common and preferred spelling in most modern English.

Use adapter for devices, plugs, chargers, cables, computer parts, and most general writing.

Adaptor is a less common variant and may appear in British or older usage.

The easiest way to remember the spelling is:

adapt + er = adapter

So the safest spelling is:

adapter