Mathematiques
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Convertisseur de Pourcentage.
Convertissez un pourcentage en décimal, un décimal en pourcentage, un pourcentage en fraction entièrement réduite, ou un pourcentage en probabilité avec le format 1 sur N et les cotes.
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Les résultats se mettent à jour pendant la saisie.
Comment utiliser
Rule information
Fraction information
Precision information
FAQ
How do I convert a percentage to a decimal?
Divide by 100, which is the same as moving the decimal point two places to the left: 25% → 0.25, 7% → 0.07, 150% → 1.5, 0.5% → 0.005. To go the other way, multiply by 100 and add the % sign.
What is 25% as a fraction?
1/4. Writing it as 25/100 is correct but not reduced — dividing the top and bottom by their greatest common divisor, 25, gives 1/4. This converter always reduces to lowest terms, so you get 1/4, not 25/100. Similarly 12.5% is 1/8, 75% is 3/4 and 150% is 3/2 (or 1½).
What does a percentage mean as a probability?
A 25% chance is a probability of 0.25, which is the same as '1 in 4', with odds in favour of 1:3 (one way it happens for every three ways it does not). Note that odds and probability are not the same thing: 1:3 odds means 1/4 probability, not 1/3.
Why does 0.1 sometimes show as 0.10000000000001 in other calculators?
Computers store decimals in binary, where values like 0.1 have no exact representation, so 0.1 × 100 can come out as 10.000000000000002. This converter rounds every result to a fixed precision before displaying it, so 10% converts to exactly 0.1 and 0.07 converts to exactly 7%.
How do I write a repeating percentage like 33â…“% as a fraction?
Exactly, it is 1/3. Typing 33.333% here gives 33333/100000, because that is literally the number you entered. The converter honours up to six decimal places of the percentage and flags the result as approximate when the value had to be rounded, so you can tell an exact fraction from a near-miss.