Comprehensive Percentage Calculator Guide
Percentages are used everywhere—from calculating sales tax and discounts to tracking stock market changes. This tool is designed to make those math problems easy for anyone, whether you're a student in the US, a trader in Australia, or a consumer anywhere in the world.
Scenario: Sale Discounts
If a $120 jacket is on sale for 30% off, use the Percentage mode to find 30% ($36) or use the Reverse % mode if you know the final price and want to find what it was originally.
How to Calculate Percent Change
Percentage change helps you see how much something grew or shrunk. For example, if your website had 100 visitors yesterday and 120 today, that's a 20% increase.
The Formula
Change % = ((New Value - Old Value) / |Old Value|) x 100
Our calculator handles the math for you automatically. If the result is positive (+), it's an increase. If it's negative (-), it's a decrease.
Reverse Percentage (Restoring the Original Value)
Reverse percentage is used to find the original value when you only know the final amount and the percentage that was added or subtracted. Common use: Finding the price before tax or before a store discount was applied.