Percentage Calculator
Calculate percentages, percent change, difference, and discounts in one place. Choose one of four modes and get the result instantly.
How Percentage Calculations Work
Find X% of a value
20% of 500 = 500 × 0.20 = 100
Formula: result = value × (percent ÷ 100)
Calculate percentage change
From 80 to 100: (100 - 80) ÷ 80 × 100 = 25% increase
Formula: change = (new value - original value) ÷ original value × 100
Calculate a discount
A product priced at 50,000 with a 30% discount: 50,000 × 0.30 = 15,000 off → 35,000
Frequently Asked Questions
What is 15% of 500?
500 × 0.15 = 75. In the calculator, choose the X% of Y mode and enter 15 and 500.
How do I calculate percentage increase or decrease?
The rate of change from A to B is (B - A) ÷ A × 100. A positive result is an increase and a negative result is a decrease.
How do I calculate the price after a discount?
Discounted price = original price × (1 - discount rate / 100). For a 20% discount on 50,000, calculate 50,000 × 0.8 = 40,000.
How do I calculate a tax-inclusive price?
If tax is 10%, the tax-inclusive price is pre-tax price × 1.1. To find the pre-tax price, divide the final price by 1.1.