How the originality score is calculated
Every PlagiatX check returns two numbers: the plagiarism score (share of text similar to other sources) and the AI score (share of text likely written by AI). Originality is computed from both with one public formula — identical on the website and in the PDF certificate.
The formula
Originality = 100 − (P + A − P × A / 100), where P is the plagiarism score and A the AI score. The P × A / 100 term prevents text flagged as both copied and AI-written from being counted twice. In plagiarism-only mode originality = 100 − P; in AI-only mode = 100 − A.
Examples
- Plagiarism 20%, AI 10% → 100 − (20 + 10 − 2) = 72% originality.
- Plagiarism 5%, AI 0% → 95% originality.
- Plagiarism 40%, AI 50% → 100 − (40 + 50 − 20) = 30% originality.
Reading the result correctly
- Look at which sentences are highlighted, not only the number: properly cited quotes and standard definitions can also match sources.
- The AI score is a probability, not proof; the final decision stays with the teacher or supervisor.
- The minimum required originality is set by your university or department — check their requirements.
- If you think a result is wrong, report it with the "Wrong result?" button on the result page.
Questions
Why isn't originality simply 100 − plagiarism − AI?
Because one sentence can be flagged as both copied and AI-written. Plain subtraction would count it twice; the formula adds that overlap (P × A / 100) back.
Can the certificate show a different number than the website?
No. The website and the PDF certificate use the same formula, enforced by automated tests.
Originallik foizi qanday hisoblanadi
PlagiatX har bir tekshiruvda ikki ko'rsatkich beradi: plagiat foizi (boshqa manbalarga o'xshash matn ulushi) va AI foizi (sun'iy intellekt yozgan bo'lishi ehtimoli yuqori matn ulushi). Originallik foizi ana shu ikkalasidan bitta ochiq formula bilan hisoblanadi — sahifada ham, PDF sertifikatda ham aynan bir xil.
Как считается процент оригинальности
В каждой проверке PlagiatX даёт два показателя: процент плагиата (доля текста, похожего на другие источники) и процент ИИ (доля текста, вероятно написанного ИИ). Оригинальность считается из них по одной открытой формуле — одинаково на сайте и в PDF-сертификате.
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