How to Use

Choose a Calculation Mode

Select from the tabs: basic percentage, percent change, ratio, or discount calculator.

Enter Your Values

Type the numbers in the input fields. Results update automatically as you type.

Read the Result

The answer appears instantly below with the formula used for the calculation.

Percentage Calculator — Solve Any Percentage Problem Instantly

Percentages appear everywhere — exam scores, salary hikes, GST, sale discounts, profit margins, interest rates. Most people learned the formulas in school but need a calculator to apply them quickly without making arithmetic errors. This tool covers all the common percentage calculation types, so you don't have to remember which formula applies to which problem.

Calculation types

What is X% of Y? The most basic: "What is 18% of ₹5,000?" — the answer is ₹900. Used for calculating GST amounts, tips, commission, and discounts.

X is what % of Y? "45 marks out of 60 is what percentage?" — the answer is 75%. Used for converting scores to percentages, understanding what fraction one value represents of another.

Percentage increase/decrease: "A salary went from ₹40,000 to ₹46,000 — what's the percentage increase?" — the answer is 15%. Or "A product's price dropped from ₹800 to ₹680 — what's the percentage decrease?" — the answer is 15%.

Original value from percentage change: "After a 20% increase, the price is ₹960 — what was the original price?" — the answer is ₹800. Used for working backward from a final value to find what it started as.

Common use cases

GST calculations: Most goods and services in India attract GST at 5%, 12%, 18%, or 28%. "What is 18% of ₹2,500?" gives ₹450 — your GST component. Or "What was the pre-GST price if the total including 18% GST is ₹2,950?" — this requires the reverse calculation (divide by 1.18), which the tool handles.

Salary hike negotiation: If your current CTC is ₹7.5 LPA and you're offered a 15% hike, what's the new package? ₹8.625 LPA. Or you want to negotiate to ₹9 LPA — what percentage hike is that? 20%.

Exam scores and academic performance: CBSE, ICSE, board exams, university semester results, JEE/NEET percentile calculations, and competitive exam scores all work with percentages. Convert your marks to percentage quickly.

Business and finance: Profit margin, markup percentage, return on investment, discount calculation, TDS percentage — these are daily calculations for anyone running a business or handling accounts.

Investment returns: "My mutual fund NAV went from ₹25 to ₹31 in a year — what was the percentage return?" — 24%. Understanding percentage returns helps compare investments across different amounts and timeframes.

Tips

Be careful about the direction of percentage change calculations. A 50% increase followed by a 50% decrease does not return to the original value. ₹100 → 50% increase → ₹150 → 50% decrease → ₹75. Percentage changes are asymmetric.

For compound percentage changes (two successive percentage changes), don't simply add the percentages. A 10% increase followed by another 10% increase is not a 20% increase — it's 21% (1.1 × 1.1 = 1.21). Use this tool twice sequentially for compound calculations.

Limitations

This tool handles single-step percentage calculations. For multi-step calculations (compound interest over multiple years, CAGR), use a dedicated calculator for those specific formulas. The results here are arithmetically precise — any discrepancy with official calculations (like tax) is likely due to rounding rules that specific government or financial systems apply.

Frequently Asked Questions

Use the "% Change" tab. Enter the old value and the new value. The formula is: ((New - Old) / Old) × 100. A positive result means increase; negative means decrease.

Use the Discount tab. Enter the original price and the discount percentage. The tool automatically calculates the final price and how much you save.