Percentage Calculator
Multi-mode percentage tool: calculate percentage of a number, percentage of total, and percentage increase/decrease.
(15 × 250) ÷ 100 = 37.5
Calculation Formula & Methodology
Solves percentage problems across three common scenarios: Percentage of a number (X% of Y = (X × Y) ÷ 100), Percentage ratio (X is what % of Y = (X ÷ Y) × 100), and Percentage change / growth (((New - Old) ÷ Old) × 100).
Example: 15% discount on an item costing ₹2,500
Inputs: Discount % = 15 | Original Price = ₹2,500
Calculation: Discount Amount = (15 × 2500) ÷ 100 = ₹375. Final Price = 2500 - 375 = ₹2,125
Outcome: Discount = ₹375 | Net Payable = ₹2,125
Key Insights & Financial Takeaways
- Percentage Change: A positive value indicates percentage growth/inflation, while a negative value indicates percentage discount or depreciation.
- Quick Mental Math: To find 10% of any number, move the decimal point one place left. For 15%, add half of that 10% value.
How Percentage Calculator Works
Free online Percentage Calculator. Easily compute percentage of a number, percentage change, and percentage differences. This calculator performs all math instantly in your web browser. Input parameters are processed locally on your client machine—no financial or personal metrics are ever transmitted to external servers.
100% In-Browser Math
Calculations run locally in JavaScript. Fast, accurate, and private.
Instant Calculation
Real-time updates as you slide or type values.
Privacy Assured
Zero tracking of financial or health numbers.
Frequently Asked Questions
How do I calculate percentage increase or decrease?
Subtract the old value from the new value, divide by the old value, and multiply by 100. Formula: ((New - Old) ÷ Old) × 100.
How do I find what percentage one number is of another?
Divide the part by the whole and multiply by 100. For example, 25 out of 200 is (25 ÷ 200) × 100 = 12.5%.
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