Calculate what is X% of Y, percentage change, or reverse percentages. Useful for discounts, tips, and business metrics. All calculations run in your browser.
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如何使用
1Choose the calculation type (e.g. What is X% of Y?).
2Enter your numbers in the fields.
3The result updates automatically.
4Copy the value if needed.
常见问题
What is the percentage formula?
Percentage = (part / whole) × 100. The tool does this for you.
Can it do percentage decrease?
Yes. The calculator handles both increases and decreases.
Are my numbers saved?
No. Everything is calculated locally; nothing is stored.