Online Percentage Calculator (X% of Y, discounts and increases)
Understanding percentage calculations in practice
This online percentage calculator helps you solve everyday situations such as discounts, increases and proportional values. To find X% of Y, simply enter the desired percentage (for example, 15 for 15%) and the base value. The result shows the exact corresponding amount. Formula: Result = (Percentage ÷ 100) × Base value. Use it for sales, commissions, interest rates, adjustments and comparisons.
How to use the online percentage calculator
1. In the percentage field, type the value without the % symbol (e.g., 10 for 10%). 2. In the base value field, enter the number the percentage will be applied to. 3. Click "Calculate percentage" to see the numeric result and the formula used. 4. Try different combinations to calculate discounts, increases, commissions and more.
Frequently asked questions about percentages
How do I calculate X% of Y?
Use the formula: (X ÷ 100) × Y. Example: 15% of 200 = (15 ÷ 100) × 200 = 30. The calculator applies exactly this formula for you.
How do I calculate a discount using percentages?
First calculate the discount amount (e.g., 20% of 150). Then subtract this value from the original price: 150 - 30 = 120. The same logic works for any promotion.
How do I calculate a percentage increase (adjustment)?
Calculate the percentage value and add it to the original amount. Example: an 8% increase on 1,000 = 80; new value = 1,080. Common in salary, fee and subscription adjustments.