➗ Percentage Calculator
Three calculators in one — find % of a number, what % one number is of another, or calculate % change. Instant results as you type.
About This Percentage Calculator
MyQuickTool's Percentage Calculator packs three calculation modes into one fast, clean tool. Whether you're working out GST on an invoice, figuring out your exam score as a percentage, or calculating a salary hike — results appear instantly as you type, no submit button required.
Unlike single-purpose calculators that make you open separate pages for each type of calculation, this tool keeps everything in one place. The ₹ Rupee Format switch applies Indian locale formatting (lakhs and crores) to all results. GST quick-fill buttons (5%, 12%, 18%, 28%) let you calculate tax amounts in a single click.
Mode 1 — What is X% of Y?
Enter a percentage and a base number to find the result. The tool also shows the remaining amount (useful for discounts: if 25% off ₹2,000 is ₹500, you pay ₹1,500) and the total with the percentage added (useful for GST: ₹1,000 + 18% = ₹1,180). The visual bar shows exactly how large the percentage is at a glance.
- GST — What is 18% of ₹5,000? → ₹900 GST, total ₹5,900
- Discount — What is 25% of ₹2,400? → ₹600 off, you pay ₹1,800
- Commission — What is 2.5% of ₹8,00,000? → ₹20,000
- Interest — What is 7.5% of ₹50,000? → ₹3,750 per year
Mode 2 — X is What % of Y?
Find what percentage one number is of another. Enter the part and the whole — the tool shows the percentage, remaining portion, and remaining percentage. Common fraction quick-fill buttons (½, ¼, ¾, ⅓, ⅔) let you explore equivalencies instantly. Useful for exam scores, profit margins, savings rates, and market share.
- Exam score — 450 is what % of 500? → 90%
- Savings rate — ₹15,000 savings of ₹75,000 income → 20%
- Profit margin — ₹12,000 profit on ₹80,000 revenue → 15%
- Market share — ₹3.5L of ₹20L total → 17.5%
Mode 3 — Percentage Change
Calculate how much a value has increased or decreased. Enter the original and new value to get the exact percentage change, color-coded green for increases and red for decreases. The built-in reverse calculator answers "if my value of ₹45,000 increases by 15%, what will it become?" — all without switching pages.
- Salary hike — From ₹45,000 to ₹52,200 → +16% increase
- Stock return — Bought at ₹340, now ₹510 → +50% gain
- Price drop — ₹1,299 to ₹999 → −23.1% decrease
- Inflation — Petrol from ₹95 to ₹107 → +12.6% increase
Key Percentage Formulas
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. Formula: (P × N) ÷ 100 = result. Example: 18% of ₹5,000 = (18 × 5,000) ÷ 100 = ₹900. Use the first tab "What is X% of Y?" and enter both values — the answer updates instantly as you type.
How do I find what percentage one number is of another?
Divide the part by the whole and multiply by 100. Formula: (part ÷ whole) × 100 = %. Example: 750 is what % of 1,000? → (750 ÷ 1,000) × 100 = 75%. Use the second tab "X is what % of Y?" and enter both numbers to get the result immediately.
How is percentage change calculated?
Subtract the old value from the new value, divide by the old value, and multiply by 100. Formula: ((New − Old) ÷ Old) × 100. A positive result is an increase; negative is a decrease. Example: from ₹800 to ₹1,000 → ((1,000 − 800) ÷ 800) × 100 = +25% increase.
How do I calculate GST in India using this tool?
Use the first tab "What is X% of Y?". Click the GST quick-fill button for your applicable rate (5%, 12%, 18%, or 28%), then enter the base price in the second field. The GST amount appears as the main result. The "Total (base + result)" box below the bar shows the final GST-inclusive price. Enable ₹ Rupee Format for Indian number formatting.
Is my data saved or sent to a server?
No. Every calculation runs entirely inside your browser using JavaScript. No numbers, results, or any other data are ever sent to our servers. Your calculations are completely private. When you close the tab, all values are gone.