Free Online Percentage Tools
Results update instantly as you type — no calculate button required.
Designed for fast workflows on laptops and desktops, while remaining mobile-friendly.
Use this free online percentage calculator to instantly solve common math problems. Whether you need to determine percentage increases for analysis, calculate the percentage difference between two numbers, or figure out what percentage X is of Y, this tool delivers accurate results in real-time. Your inputs and recent calculations are saved locally in your browser for convenience.
This calculator includes:
- Percentage of a number
- Percentage from total
- Reverse percentage
- Percentage increase
- Percentage decrease
- Percentage difference
Frequently Asked Questions
1. How do I calculate a percentage increase?
Subtract the original number from the new number, divide the result by the original number, and then multiply by 100.
2. How do I find X percent of Y?
Divide the percentage (X) by 100 and multiply it by the number (Y). For example, 20% of 50 is (20/100) * 50 = 10.
3. What is the percentage difference formula?
In this calculator, percentage difference is calculated by dividing the difference between two values by the second value (B) and multiplying by 100.
4. What is percentage increase?
Percentage increase shows how much a value has grown compared to its original value.
5. Is this calculator free to use?
Yes. This tool is completely free and runs entirely in your browser.
6. Is percentage change included in this calculator?
Yes. Percentage change is calculated using percentage increase when a value increases, and percentage decrease when a value decreases. This provides clearer results without negative percentages.