Calculateur de Variation en Pourcentage
Calculez la variation en pourcentage entre deux valeurs.
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Calculating Percentage Increase and Decrease
Aperçu
Percentage change measures how much a value has grown or shrunk relative to its starting point — essential for tracking prices, metrics, and results. This calculator finds the percentage increase or decrease between two numbers instantly in your browser.
Comment utiliser (étape par étape)
- 1
Enter the original value
The starting (old) number.
- 2
Enter the new value
The number you are comparing against the original.
- 3
Read the percentage change
A positive result is an increase, negative is a decrease.
Comment ça marche
Percentage change = ((new value − old value) ÷ old value) × 100. A positive result is an increase, a negative one a decrease. The key is that the change is always measured against the original (old) value, which is why a rise from 50 to 100 is a 100% increase, but a fall from 100 to 50 is only a 50% decrease — the base is different each way.
Quand l'utiliser
Tracking a price rise or drop. Measuring growth in followers, sales, or traffic. Comparing this period's figure against last period's.
Questions Fréquentes
Because percentage change is measured against the starting value. 50 to 100 is +100% (base 50), but 100 to 50 is −50% (base 100).