% Percentage Calculator
Three essential percentage calculations: find a percentage of a number, compute what percent one number is of another, and calculate percentage increase/decrease.
📐 1. Percentage of a Number
Result: 40
📊 2. What Percent is A of B?
Result: 20%
📈 3. Percentage Change (Increase/Decrease)
Result: +20% increase
📖 How to Use the Percentage Calculator (Step by Step)
- Step 1: Choose the calculation type you need.
- Step 2: Enter the required numbers in the input fields (or click an example button to try).
- Step 3: The result updates instantly – no extra button needed.
- Step 4: For percentage change: positive result = increase, negative = decrease.
- Step 5: Copy the result or use it in your work.
💡 Common Use Cases
- ✔️ Calculate discounts: "20% off $200" → $40 saved.
- ✔️ Find test scores: "35 correct out of 50" → 70%.
- ✔️ Track price changes: "Old price $100, new $120" → 20% increase.
💡 Pro Tip: Use the example buttons to quickly test each calculator. All results are updated in real time as you type.
🔒 100% client‑side • No data uploaded • Three calculators in one • Zero tracking