Percentage Calculator - Free Online Tool
Calculate percentages instantly — find X% of Y, percentage change, increase, and decrease. Free online percentage calculator with instant results.
Calculate percentages instantly — X% of Y, percentage change, increase, decrease
Percentage Calculator Features
- Basic Percentage: Calculate what is X% of Y — the most common percentage operation
- Reverse Percentage: Find what percentage X is of Y — great for scores, discounts, and ratios
- Increase & Decrease: Calculate percentage change between two numbers
- Instant Results: Results update in real-time as you type — no submit button needed
How to Use Percentage Calculator
Calculate percentages in three steps
- Step 1: Choose Mode — Select the type of percentage calculation
- Step 2: Enter Values — Type your numbers — results appear instantly
- Step 3: Copy Result — Copy the answer to clipboard with one click
Frequently Asked Questions about Percentage Calculator
How do I calculate X% of a number?
Divide the percentage by 100 and multiply by the number. For example, 25% of 200 = (25/100) × 200 = 50. Our calculator does this instantly.
How do I find what percentage one number is of another?
Divide the first number by the second and multiply by 100. For example, 50 is what % of 200? (50/200) × 100 = 25%.
How is percentage change calculated?
Percentage change = ((New Value - Old Value) / |Old Value|) × 100. A positive result means increase, negative means decrease.
Can I calculate percentage increase and decrease?
Yes! Use 'Increase by %' or 'Decrease by %' mode. Enter the original value and the percentage to add or subtract.
Is this percentage calculator free?
Yes, completely free with no signup. All calculations happen instantly in your browser — no data is sent to any server.
Can I use this for exam marks percentage?
Yes! Use 'X is ?% of Y' mode — enter your obtained marks as X and total marks as Y to get your percentage.
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