machine-learning
Free
Accuracy Calculator
Calculate classification accuracy from true/false positives and negatives.
Open toolML & Data Science Quiz
Pick a topic and difficulty, then answer a random set of multiple-choice questions drawn from the BestWordz question bank. Every answer gets instant feedback with a short explanation, and at the end you see your score, percentage, and a grade. Your answers stay in your browser — nothing is submitted or stored.
Privacy: your answers never leave your browser. The questions are loaded from this site, but nothing you select is ever sent anywhere.
Enter your values and press Calculate — the result appears here.
Frequently asked questions
Where do the quiz questions come from?
From the BestWordz question bank (the quiz_questions table): 100+ multiple-choice questions on statistics, machine-learning metrics, and general AI concepts, each with an explanation. Questions are picked at random for every quiz.
How is my score calculated?
Each correct answer is one point. Your score is the number of correct answers out of the total, shown as a percentage at the end, with a grade from Keep practicing to Excellent.
Do my answers get sent anywhere?
No. The questions are loaded from this site, but the quiz runs entirely in your browser — your selections are never submitted to the server. Only an anonymous start/finish signal is recorded for the site analytics, with no personal data.
Can I get a quiz on just one topic?
Yes — pick Machine Learning & AI or Data Science & Statistics in the Topic dropdown, or leave it on All topics to mix everything together. You can also filter by difficulty (easy, medium, or hard).
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