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Percentage calculator

Three everyday percentage questions, each with its own box. Type the numbers and the answer and the working appear straight away.

Runs in your browser. Nothing you enter is sent to or stored by EpiFive.

What is X% of Y?

30 (15 ÷ 100 × 200)

X is what percent of Y?

25% (50 ÷ 200 × 100)

Percentage increase or decrease

20% increase ((120 − 100) ÷ 100 × 100; difference 20)

How to use it

  1. What is X% of Y? for discounts, tips and tax: 20% off ₹2,499 is ₹499.80 off.
  2. X is what percent of Y? for marks, attendance and shares: 432 of 500 is 86.4%.
  3. Percentage increase or decrease for price changes, salary hikes and growth: the answer says increase or decrease.

Mental shortcuts

  • 10% of a number: move the decimal point one place left. 5% is half of that.
  • X% of Y equals Y% of X: 8% of 50 is the same as 50% of 8, which is 4.
  • To add 18% GST, multiply by 1.18; to reverse it, divide by 1.18.
  • GST calculator: Add or remove GST at 5%, 18%, 40%, the older 12% and 28% slabs, or any rate, with the CGST and SGST split.
  • EMI calculator: Monthly EMI, total interest and a year-by-year repayment table for home, car and personal loans.
  • Unit converter: Convert length, weight, temperature and data sizes (KB, MB, GB in both 1000 and 1024).
  • Age calculator: Exact age in years, months and days from a date of birth, plus days to your next birthday.

Questions people ask

How do I calculate a percentage of a number?

Divide the percentage by 100 and multiply by the number. 15% of 200 = 15 ÷ 100 × 200 = 30.

How do I calculate my marks percentage?

Divide the marks you scored by the total marks and multiply by 100. 432 out of 500 is 432 ÷ 500 × 100 = 86.4%. Use the second calculator: X is your marks, Y is the total.

How do I calculate percentage increase?

Subtract the old value from the new value, divide by the old value and multiply by 100. A salary going from ₹40,000 to ₹46,000 is a (46,000 − 40,000) ÷ 40,000 × 100 = 15% increase.

Why is a 50% fall not undone by a 50% rise?

Because the base changes. ₹100 falling 50% becomes ₹50; a 50% rise on ₹50 is only ₹25, giving ₹75. To get back to ₹100 you need a 100% rise.

What is the difference between percent and percentage points?

If a loan rate moves from 8% to 9%, it rose by 1 percentage point, but by 12.5% in relative terms (1 ÷ 8 × 100).