Percentage Calculator - Calculate Percentages Online
Use the percentage calculator for discounts, growth, change, margins, marks, and quick comparison math.
Interactive tool
This tool runs in your browser. Enable JavaScript to use the interactive features.
Quick Guide
The calculator solves common percentage questions such as what percent one number is of another, percentage change, and adding or removing percentages.
- Choose the percentage calculation you need.
- Enter the base number, percent, or comparison values.
- Review the result and adjust inputs to compare scenarios.
Best for: Discounts, reports, business changes, grades, growth rates, and everyday comparisons.
What this tool does
The calculator solves common percentage questions such as what percent one number is of another, percentage change, and adding or removing percentages.
Useful examples
- Find 18% of a price before tax.
- Calculate percentage increase from last month to this month.
- Work out a sale discount or markup.
FAQs
How do I calculate percentage change?
Subtract the old value from the new value, divide by the old value, then multiply by 100. The tool automates this workflow.
Can this help with discounts?
Yes. Enter the original price and discount percentage to estimate the reduced amount.