Percentage Calculator
Fast and ergonomic tool to calculate percentages, percentage change, sales discounts, and reverse percentages.
boltInstant Calculation
%
Calculated Result
30
(20 ÷ 100) × 150 = 30
Visual proportion of 20%20.0%
Guide de Calcul de Pourcentages, Augmentations et Remises
Les pourcentages expriment des proportions sur 100, utilisés pour les soldes et les taux.
1How to Find a Percentage of a Number
To find a percentage of any number, divide the percentage by 100 to convert it into a decimal rate, then multiply it by the total number.
Formula: Value = (Percentage ÷ 100) × Total
Example: What is 20% of 150? (20 ÷ 100) × 150 = 0.20 × 150 = 30.
2How to Calculate What Percentage One Number is of Another
When you know the partial amount and the total, divide the part by the total and multiply by 100 to convert to a percentage.
Formula: Percentage = (Part ÷ Total) × 100
Example: You scored 45 out of 60 on an exam. (45 ÷ 60) × 100 = 0.75 × 100 = 75%.
3How to Calculate Percentage Increase or Decrease
Percentage change measures the relative difference between an original starting value and a new final value.
Formula: % Change = ((New Value - Original Value) ÷ Original Value) × 100
Example: An item price goes from $100 to $125. ((125 - 100) ÷ 100) × 100 = +25% increase.
Quick Percentage Reference Cheat Sheet
| Total | 10% | 15% | 20% | 25% | 50% |
|---|---|---|---|---|---|
| $10 | $1.00 | $1.50 | $2.00 | $2.50 | $5.00 |
| $50 | $5.00 | $7.50 | $10.00 | $12.50 | $25.00 |
| $100 | $10.00 | $15.00 | $20.00 | $25.00 | $50.00 |
| $500 | $50.00 | $75.00 | $100.00 | $125.00 | $250.00 |
Foire Aux Questions
Soustrayez l'ancienne valeur de la nouvelle, divisez par l'ancienne et multipliez par 100.