Percentage Calculator — Calculate Percentages Instantly
Calculate percentages, percentage change, and more
The Percentage Calculator solves the most common percentage problems with three calculation modes: find X% of a number, find what percentage one number is of another, and calculate the percentage increase or decrease between two values. No more mental math — get instant, accurate results.
1Three Types of Percentage Calculations
Mode 1 — "What is X% of Y?": Use for calculating discounts, tips, tax amounts, and interest. Formula: Result = (X/100) × Y. Example: What is 15% of ₹850? Answer: ₹127.50. Mode 2 — "X is what % of Y?": Use for finding what fraction one number is of another. Formula: % = (X/Y) × 100. Example: 45 out of 60 marks is 75%. Mode 3 — Percentage Change: Use for tracking price changes, growth rates, and comparisons. Formula: % Change = ((New – Old)/|Old|) × 100.
2Percentage in Everyday Finance
Percentages are fundamental to personal finance. Interest rates on loans and FDs are expressed as percentages. Inflation erodes purchasing power at a rate of 5–6% annually in India. A mutual fund delivering 15% CAGR doubles your money every 4.8 years (Rule of 72: 72 ÷ rate = years to double). Tax slabs are percentage-based. Understanding percentages helps you evaluate investment returns, loan costs, and price changes objectively.
3Percentage Increase vs Absolute Increase
A stock price rising from ₹100 to ₹110 is a 10% increase. But if it rises from ₹1,000 to ₹1,010, that's only a 1% increase despite the same ₹10 absolute gain. Similarly, a 50% decline requires a 100% gain to recover. This asymmetry is crucial in investing: losing 50% requires doubling your money just to break even. Always think in both absolute and percentage terms.
4Common Percentage Shortcuts
Quick mental math: 10% of any number — move decimal one place left. 5% = half of 10%. 1% = move decimal two places left. 20% = double of 10%. 25% = divide by 4. 33.33% ≈ divide by 3. 50% = divide by 2. 75% = three-quarters. These shortcuts speed up mental calculations during negotiations, shopping, and quick financial estimates.
Frequently Asked Questions
Percentage Change = ((New Value – Old Value) / |Old Value|) × 100. A positive result means an increase; negative means a decrease. For example: price went from ₹200 to ₹250. Change = (250–200)/200 × 100 = 25% increase.