Analyse vs Analyze: Which Spelling to Use

Analyze is the American spelling and analyse is the British and Australian spelling. Both mean exactly the same thing: to examine something closely and break it into parts so you can understand it.

The choice is purely regional, so you never pick between them based on meaning. What trips people up is that analyse behaves differently from other -ise/-ize verbs. Even British writers who happily spell organize with a z still write analyse with an s, and there is a good reason for that.

Quick answer: Use analyze for American (and usually Canadian) readers. Use analyse for British, Australian, Irish and New Zealand readers. The noun analysis is spelled the same everywhere.

On this page

1. What the word means
2. Why analyse is not just another -ise/-ize word
3. Analyse vs analyze by country
4. Example sentences
5. Common mistakes
6. A memory trick that works
7. Style guides and international writing
8. Practice quiz
9. Related spelling questions
10. The practical takeaway

What the word means

To analyse or analyze something is to study it in detail, usually by separating it into its components and looking at how they relate. You can analyze data, a poem, a chemical sample, a football match or your own feelings.

• Part of speech: verb (transitive, and occasionally used without an object: "She spent the afternoon analysing.")
• Pronunciation: AN-uh-lyze in every country. The s and the z sound identical here, so you cannot hear which spelling someone prefers.
• Related forms: analysis (noun), analyses (plural noun, pronounced uh-NAL-uh-seez), analyst (person), analytic and analytical (adjectives), analyzable/analysable.

Where the word comes from

The source is the Greek noun analysis, meaning "a loosening" or "a breaking up". It combines ana- ("up, back, throughout") with lysis ("loosening"), from the verb lyein, "to loosen or untie". The same root appears in paralysis, catalysis and dialysis, and in the scientific suffix -lysis (as in electrolysis and hydrolysis).

English borrowed the noun first. The verb arrived later, apparently shaped partly by French analyser. That history matters, because it explains the spelling puzzle in the next section.

Why analyse is not just another -ise/-ize word

Most -ise/-ize pairs, like realise/realize or organise/organize, trace back to the Greek verb-forming suffix -izein. Because the original suffix had a z (the Greek letter zeta), the -ize spelling can claim to be the etymological one. That is why Oxford University Press, and some other British publishers, prefer -ize. You can read more about that split in our guide to organise vs organize.

Analyse is different. The "-lyse" part is not a suffix at all. It is the lys- root, meaning "loosen", plus a silent e. There is no Greek zeta anywhere in its history.

So British writers who follow Oxford spelling write:

• organize, recognize, realize (with z, because of the -izein suffix)
• analyse, paralyse, catalyse (with s, because of the lysis root)

Americans, by contrast, apply z to both groups. Noah Webster's spelling reforms in the early nineteenth century pushed American English toward simpler, more regular forms, and analyze fit the pattern of other American -ize verbs. Whatever its exact path, by the twentieth century analyze was firmly the American standard and analyse the British one.

The -yse / -yze family

Analyse travels with a small group of verbs that all share the Greek lysis root. They switch together:

If you change one, change the whole family. A document with analyze and paralyse side by side looks like it was edited by two people who never met.

Analyse vs analyze by country

This is the core of the question, so here is the full picture, including Canada because many readers write for Canadian audiences too.

United States

Analyze is the only standard spelling. American dictionaries may mention analyse as a British variant, but no American style guide recommends it. An American teacher or editor will treat analysed as a slip, not a stylistic choice.

United Kingdom

Analyse is overwhelmingly standard. You will see it in British newspapers, university mark schemes, NHS documents and A-level exam papers ("Analyse the extent to which..."). Analyze does appear in British writing, mostly in technology, scientific papers aimed at international journals, and text written with American software settings, but most British readers notice it as American.

Australia

Australian English treats analyse as standard and analyze as American. Australian school syllabuses use "analyse" as a formal task verb, so Year 12 students in Sydney or Perth meet it constantly in exam instructions. Australian government and university style guides follow the British-style -yse spelling, and most Australian writers also use -ise for verbs like organise.

Canada

Canada is the interesting middle case. Canadian English keeps British colour and centre but generally takes American -ize and -yze endings. So a Toronto newspaper would usually print analyze, even while spelling labour with a u.

Example sentences

Everyday life

1. Ben spent the whole drive home analysing what his manager meant by "Let's chat tomorrow." (UK)
2. My sister likes to analyze every text message before she replies. (US)
3. Don't overanalyse it; he probably just forgot to call. (AU)
4. The coach sat in the stands at the Gabba, analysing the opposition's line-out. (AU)
5. We analyzed three different phone plans before switching carriers. (US)

Workplace and email

6. "Hi Priya, could you analyse last quarter's sales figures before Thursday's meeting in Leeds?" (UK)
7. "Our team in Columbus analyzed the survey responses and found a clear pattern." (US)
8. "I've attached the spreadsheet. Once you've analysed the returns, let me know if anything looks off." (AU)
9. The consultant was hired to analyze the company's supply chain.
10. Please analyse the customer complaints by region and by product line.

Academic writing

11. This essay analyses the use of weather imagery in Wuthering Heights. (UK)
12. Students must analyze at least two primary sources in their final paper. (US)
13. The samples were analysed using mass spectrometry. (UK/AU journal style)
14. Researchers at a university in Melbourne analysed sleep data from 400 volunteers. (AU)
15. The authors analyze the policy's long-term effects on rural employment. (US)

News style

16. Economists are still analysing the effect of the interest-rate rise on Brisbane house prices. (AU)
17. Investigators analyzed flight data recovered from the aircraft. (US)
18. The Met Office analysed decades of rainfall records for its latest climate report. (UK)
19. Election officials in Ohio are analyzing turnout figures by county. (US)
20. Pundits spent the morning analysing the prime minister's speech. (UK/AU)

Related forms in context

21. The data analyst presented her analysis to the board; the two analyses reached the same conclusion.
22. A stroke can leave a patient partially paralysed. (UK/AU) / partially paralyzed. (US)
23. The enzyme catalyzes the reaction in seconds. (US)

Common mistakes

Most errors here are not about choosing the "wrong" country's spelling, but about mixing systems or confusing the verb with the noun.

❌ We need to analysis the results. ✅ We need to analyse (or analyze) the results. Analysis is the noun; the verb is analyse/analyze.

❌ She analyses the data yesterday. ✅ She analysed the data yesterday. Watch the tense; analyses is present tense (or the plural noun).

❌ The report analyzes sales and paralyses decision-making. (mixed systems) ✅ The report analyzes sales and paralyzes decision-making. (US) / The report analyses sales and paralyses decision-making. (UK/AU)

❌ I organised the data and then analyzed it. (British -ise next to American -yze) ✅ I organised the data and then analysed it. (UK/AU)

❌ Analysize, analyise, analize ✅ Analyse or analyze The y is essential in both spellings; it comes from the Greek lysis.

❌ The two analysis were very different. ✅ The two analyses were very different. The plural of analysis is analyses (uh-NAL-uh-seez), which looks identical to the British present-tense verb. Context tells you which one it is.

A trap with "analyses"

In British and Australian English, analyses can be either a plural noun or a third-person verb:

• "The analyses were published in June." (noun, plural)
• "She analyses the results every Monday." (verb)

In American English the verb is analyzes, so the ambiguity disappears. If you are writing British English and a sentence feels confusing, rephrase it rather than leaving the reader to guess.

A memory trick that works

Think of the Greek root lysis, meaning "loosen": the s in analysis is the same s you keep in analyse.

For British and Australian English: "analysis has an s, so analyse keeps the s." The noun and verb match.

For American English: "America analyzes with a z." Both begin with A, and Americans put z in almost every -ize or -yze verb.

If you want a single image, picture an analyst in Sydney and one in Z... well, think of the z as the zigzag of an American stock chart. Silly images stick.

Style guides and international writing

Style guides in each country are consistent on this word. American guides use analyze; British and Australian guides use analyse, including those British guides that otherwise favor -ize. International organizations that publish in British English generally use analyse as well.

A few practical rules help when your audience is mixed:

1. Follow the client or publication. If a journal or company has a house style, use it, even if it differs from your own habits.
2. Set your spellchecker deliberately. Many "American" spellings in British writing come from software set to US English by default. Check the language setting before you start a long document.
3. Be consistent within a document. Readers forgive either spelling; they notice when you switch between them.
4. Don't change quotations. If you quote an American source, keep its analyze, even in a British essay.
5. Watch related words. If you switch to American spelling, you'll probably also need color, center and program. Our British vs American vs Australian spelling guide lists the main patterns.

If you are unsure how other -ise/-ize words behave, it helps to know that verbs like advertise, compromise, exercise, supervise and surprise take -ise in every country, because their -ise is not a Greek suffix either. Analyse sits in its own small group alongside them: words where British English never uses z.

Practice quiz

Choose the correct spelling for the audience shown in brackets.

1. The lab will ______ the water samples on Friday. (US)
2. Ms Kaur asked her Year 11 class to ______ the opening scene of Macbeth. (Australia)
3. The data were ______ using standard statistical software. (UK)
4. Both ______ pointed to the same weakness in the plan. (any country)
5. The accident left him temporarily ______. (UK)
6. Our team in Vancouver ______ customer feedback every month. (Canada)

Answers

1. analyze — American English uses z for this verb.
2. analyse — Australian schools and syllabuses use the -yse spelling.
3. analysed — British English keeps the s in all forms, including the past tense.
4. analyses — this is the plural noun, spelled the same in every country.
5. paralysed — it belongs to the same lysis family, so British English uses s.
6. analyzes — Canadian English generally follows the American -yze ending.

Related spelling questions

If this word gave you pause, these related articles cover similar US/UK splits: licence vs license for a noun/verb distinction that only exists in British and Australian English, and colour vs color for one of the most visible differences between the systems.

The practical takeaway

Decide who your main readers are before you write the first sentence. Use analyze for the United States and usually Canada; use analyse for the UK, Australia, Ireland and New Zealand, even if you are following Oxford -ize spelling. Keep the noun analysis unchanged, carry your choice through the whole -lyse/-lyze family, and let your spellchecker, set to the right country, catch the rest.