Calculateur de pourcentage
Calculez les pourcentages de toutes les façons.
Calculate percentages every common way: what is X% of Y, what percent X is of Y, the percentage change between two numbers, and the original value before a percentage change. Results update instantly. Everything runs locally in your browser.
Combien font X% de Y ?
=
X représente quel pourcentage de Y ?
=
Variation en pourcentage
=
Valeur d'origine avant variation
=
Votre saisie est traitée localement dans votre navigateur — rien n'est envoyé, stocké ni journalisé.
Ça vous a fait gagner du temps ?Offrez-moi un café
Comment ça marche
- 1 Pick the calculation you need.
- 2 Enter your numbers.
- 3 Read the result instantly and copy it.
Cas d'usage courants
- Work out discounts and tips.
- Find a percentage change.
- Calculate tax or markup.
- Reverse a percentage to the original.
Questions fréquentes
Is my input sent to a server?
No. Every calculation runs locally in your browser — your input is never uploaded, stored or logged.
How is percentage change calculated?
(new − old) ÷ old × 100. A positive result is an increase, a negative one a decrease.
How do I find the original value?
If a value already includes a change of p%, the original is value ÷ (1 + p/100).
Is it really free?
Yes — free, with no signup and no limits.