Calcule la variation en % entre deux valeurs : augmentation, diminution ou changement.
Calculez le prix final avec ou sans taxes
Appliquez un pourcentage de remise au prix d'origine
Appliquez d'abord la remise en pourcentage, puis les coupons en dollars pour un maximum d'économies.
Appliquer la taxe de vente au prix remisé
Type the original, pre-discount price. This is the list price or the price before any sale discount is applied.
Type the discount as a percentage. Common retail discounts are 10%, 20%, 25%, 30%, or 50% off.
Get the sale price, the dollar amount saved, and the effective percentage off (which is slightly different for stacked discounts).
For related calculations, try our percentage calculator.
Variation = (N − V) / V × 100 :
| De → A | Variation | De → A | Variation |
|---|---|---|---|
| 80 → 100 | +25 % | 100 → 80 | −20 % |
| 50 → 75 | +50 % | 200 → 150 | −25 % |
| 100 → 110 | +10 % | 100 → 90 | −10 % |
**Piège courant** : monter de 25 % (80→100) puis baisser de 20 % (100→80) ne vous ramène PAS au même endroit : −20 % de 100 = 80, mais descendre de 20 % depuis 100 est différent.
Cross-checked against authoritative formulas (IRS, NIST, ACSM) and updated for 2025/2026 tax years and rates.
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FAQ
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A percentage change calculator is a free math tool that finds the percentage increase or decrease between two values. Our percentage change calculator uses the formula ((new - old) / old) x 100 and shows the absolute change too. The percentage change calculator is used for stock returns, price changes, growth rates, and performance metrics.
How it works
Our percentage change calculator lets you find the percentage increase or decrease between any two numbers, in three steps.
Type the starting value - this is the baseline the percentage is calculated from. For year-over-year changes, this is last year's number.
Type the ending value. For year-over-year, this is the current year's number. The calculator uses the original as the denominator.
The result shows the absolute change and the percentage change. The sign indicates increase or decrease, and the magnitude is the strength of the change.
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