Percentage Calculator
About Percentage Calculator
Handle everyday percentage math without mistakes. Choose the calculation type—What percent X is of Y, X percent of Y, percentage increase, or percentage decrease—then enter two values to get instant, step‑by‑step answers. Ideal for discounts, grade changes, tax differences, and KPI tracking, it clearly labels inputs and supports large or decimal values. Use it to verify invoices, compare before‑and‑after metrics, or plan price changes with confidence. Results appear immediately in an easy‑to‑read format that works great on mobile.
📝 How to Use Percentage Calculator
- Choose the type of calculation (Percentage of a number, Percentage increase/decrease, etc.).
- Enter the values in the respective fields.
- The result will appear instantly.
🧮 Formula Used
Percentage = (Part / Whole) * 100
💡 Example Calculation
- What is 15% of 200?
- Calculation: (200 * 15) / 100 = 30
❓ Frequently Asked Questions
How do I calculate X percent of Y?
Multiply Y by X and divide by 100. Example: 20% of 50 is (50 * 20) / 100 = 10.
How do I find the percentage change?
Subtract the old value from the new value, divide by the old value, and multiply by 100.
What’s the difference between percentage of and percentage change?
Percentage of finds a part of a whole (X% of Y). Percentage change compares before and after values to show increase or decrease relative to the original.
Can I use decimals and large numbers?
Yes. Inputs support decimals and big values; we keep output readable with smart formatting.
How do I avoid common mistakes?
Always double‑check which field is the base (the ‘of’ value). Our labels help prevent mix‑ups.
Can I show work for students?
Yes. The result explains steps so learners can follow the method and teachers can check quickly.