Calculator
Percentage Calculator
Calculate percent of a value, what percentage one number is of another, percent change, or increase/decrease by a percentage. Built for discounts, marks, and everyday maths—runs locally in your browser.
Percentage modes
Find P% of a number (discounts, tips, marks).
Result
300
15% of 200
Useful for
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Privacy & limitations
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Guides, tips & FAQ
What is a percentage?
A percentage expresses a proportion out of 100. “15% of 200” means fifteen hundredths of 200. Percent change compares how much a value moved relative to its starting point.
Formulas
% of X = (P ÷ 100) × X | % change = ((new − old) ÷ |old|) × 100
Increase by P%: new = value × (1 + P/100). Decrease by P%: new = value × (1 − P/100). “X is what % of Y”: (X ÷ Y) × 100.
Worked example — sale price
- List price ₹2,499 with 20% off.
- Sale price = 2499 × (1 − 0.20) = 2499 × 0.80.
- You pay ₹1,999.20; you save ₹499.80.
- ₹1,999.20 after 20% discount
Everyday uses
- Discounts, GST add-ons, and tip estimates
- Exam marks and score improvement (% change)
- Salary hike or price increase scenarios
- What share one expense is of a monthly budget
Notes
Percent change from zero is undefined (except 0 → 0). Results show at most two decimal places. For India GST breakup, use the GST calculator (illustrative only). Browse more terms in the glossary.
Frequently asked questions
Frequently Asked Questions
Marksheet percentage kaise nikale
Marksheet percentage kaise nikale?
Mode “X is what % of Y” choose karo. Part mein marks obtained daalo, Whole mein maximum marks. Result (obtained ÷ maximum) × 100 hai.
Example: 420 out of 500?
Part 420, Whole 500. Percentage 84 hai. Calculator do decimal tak dikhata hai.
CGPA ko percentage kaise banayein?
Board apna conversion khud publish karta hai. Yeh page sirf obtained ÷ total × 100 karta hai. CGPA formula yahan mat assume karo.
Subject-wise percentage?
Har subject ke obtained aur maximum alag se daalo. Total ke liye saare obtained jodo aur saare maximum jodo, phir ek baar calculate karo.