How do I calculate a discount?

Use 'Decrease X by Y%': a ₹2,000 item at 30% off costs ₹1,400.

How do I reverse a percentage?

If 1,180 is the price after adding 18%, divide by 1.18 to get 1,000. The GST calculator does this for you.

Five common percentage questions in one place, from discounts and marks to salary changes.

18% of 2500

450

X% of Y = X ÷ 100 × Y. X as % of Y = X ÷ Y × 100. % change = (Y − X) ÷ |X| × 100.

18% of ₹2,500 is ₹450. 45 out of 180 is 25%. Going from 200 to 250 is a 25% increase.

How do I calculate a discount?: Use 'Decrease X by Y%': a ₹2,000 item at 30% off costs ₹1,400.
How do I reverse a percentage?: If 1,180 is the price after adding 18%, divide by 1.18 to get 1,000. The GST calculator does this for you.

Last reviewed 2026-10-31. Results are estimates for information only and do not constitute financial, tax or legal advice.