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List of countries by Corruption Perceptions Index

List of countries by Corruption Perceptions Index is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand List of countries by Corruption Perceptions Index rather than just read about it. In short: This is a list of countries by Corruption Perceptions Index (CPI) as published by Transparency International, including scores and rankings. The Corruption Perceptions Index (CPI) assesses countries by their perceived levels of public sector corruption, as assessed by experts and business executives.

List of countries by Corruption Perceptions Index — main illustration
List of countries by Corruption Perceptions Index — illustration

Key takeaways

  • List of countries by Corruption Perceptions Index belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect List of countries by Corruption Perceptions Index to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of List of countries by Corruption Perceptions Index from memory before moving on to harder problems.

Reference excerpt

This is a list of countries by Corruption Perceptions Index (CPI) as published by Transparency International, including scores and rankings. The Corruption Perceptions Index (CPI) assesses countries by their perceived levels of public sector corruption, as assessed by experts and business executives. The CPI generally defines corruption as an "abuse of entrusted power for private gain". The index is published annually by the non-governmental organisation Transparency International since 1995. The 2024 CPI, published in February 2025, currently ranks 180 countries "on a scale from 100 (very clean) to 0 (highly corrupt)" based on the situation between 1 May 2023 and 30 April 2024. Denmark, Finland, Singapore, New Zealand, Norway, Switzerland and Sweden (almost all scoring above 80 over the last thirteen years), are perceived as the least corrupt nations in the world — ranking consistently high among international financial transparency — while the most apparently corrupt is South Sudan (scoring 8), along with Somalia (9) and Venezuela (10).

Scores since 2012 Since 2012, the Corruption Perceptions Index has been scored from 100 (very clean) to 0 (highly corrupt).

Legend

2020–2025

2012–2019

Scores from 1998–2011 From 1998 to 2011, the Corruption Perceptions Index was scored from 10.0 (very clean) to 0.0 (highly corrupt). The scores were rounded to a single decimal space.

Legend

2003–2011

1998–2002

Scores from 1995-1997 From 1995-1997, the Corruption Perceptions Index was scored from 0.00 (highly corrupt) to 10.00 (very clean). The scores were rounded to two decimal spaces.

Legend

1995–1997

Footnotes

References

External links

Official site List of Global Development Indexes and Rankings A Users' Guide to Measuring Corruption critiques the CPI and similar indices. Global Integrity Index

Illustrations

List of countries by Corruption Perceptions Index: Map of the Corruption Perceptions Index, 2025, as scored by Transparency international. A higher score indicates greater transparency (i.e., less corruption). The score ranges are: Less corrupt .mw-parser-output .legend{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .legend-color{display:inline-block;min-width:1.25em;height:1.25em;line-height:1.25;margin:1px 0;text-align:center;border:1px solid black;background-color:transparent;color:black}.mw-parser-output .legend-text{}  90–100   80–89   70–79   60–69   50–59 More corrupt   40–49   30–39   20–29   10–19   0–9   No data
Map of the Corruption Perceptions Index, 2025, as scored by Transparency international. A higher score indicates greater transparency (i.e., less corruption). The score ranges are: Less corrupt .mw-parser-output .legend{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .legend-color{display:inline-block;min-width:1.25em;height:1.25em;line-height:1.25;margin:1px 0;text-align:center;border:1px solid black;background-color:transparent;color:black}.mw-parser-output .legend-text{}  90–100   80–89   70–79   60–69   50–59 More corrupt   40–49   30–39   20–29   10–19   0–9   No data

Worked examples

Example 1 — a first encounter with List of countries by Corruption Perceptions Index

Start with the simplest possible case. Write down what List of countries by Corruption Perceptions Index claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to List of countries by Corruption Perceptions Index before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about List of countries by Corruption Perceptions Index ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of List of countries by Corruption Perceptions Index

In research
List of countries by Corruption Perceptions Index appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses List of countries by Corruption Perceptions Index in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
List of countries by Corruption Perceptions Index is common in secondary-school and first-year university syllabi. It links to neighbouring topics Corruption, Lists of countries, Lists of countries by population-related issue, so understanding it makes those chapters shorter.
In everyday life
Look for List of countries by Corruption Perceptions Index outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study List of countries by Corruption Perceptions Index in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what List of countries by Corruption Perceptions Index means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain List of countries by Corruption Perceptions Index out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is List of countries by Corruption Perceptions Index in simple terms?

This is a list of countries by Corruption Perceptions Index (CPI) as published by Transparency International, including scores and rankings. The Corruption Perceptions Index (CPI) assesses countries by their perceived levels of public sector corruption, as assessed by experts and business executive…

Why does List of countries by Corruption Perceptions Index matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study List of countries by Corruption Perceptions Index?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on List of countries by Corruption Perceptions Index.

Tags

  • Corruption
  • Lists of countries
  • Lists of countries by population-related issue

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