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% Percentage Calculator

All percentage calculations in one place. Find X% of Y, calculate percentage change, reverse percentages, and more — instantly.

Find X% of Y

What is 20% of 500?
What is % of ?
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What Percent is X of Y?

15 is what percent of 75?
is what % of ?
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Percentage Change

What is the % increase from 80 to 100?
From to
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Reverse Percentage

If 120 is 150% of a number, what is that number?
is % of what number?
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Formula

Percentage Formulas

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Find X% of Y

Formula: Result = (X / 100) × Y
Example: 20% of 500 = (20/100) × 500 = 100
Used for: discounts, tips, tax calculations, scoring.

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Percentage Change

Formula: Change% = ((New − Old) / |Old|) × 100
Positive = increase, Negative = decrease
Used for: price changes, growth rates, performance metrics.

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Reverse Percentage

Formula: Original = Value / (Percentage / 100)
Example: if 120 is 150% of X → X = 120/1.5 = 80
Used for: finding original price before discount or markup.

FAQ

Frequently Asked Questions

Common questions about Percentage calculations

How do I calculate a percentage discount?
Use the "X% of Y" mode. Enter the discount percentage and the original price. For example: 25% of ₹2,000 = ₹500 discount. The final price = ₹2,000 − ₹500 = ₹1,500. Alternatively, multiply the original price by (1 − discount/100): 2000 × 0.75 = ₹1,500.
What is the difference between percentage increase and percentage points?
If interest rates go from 5% to 7%, that's a 2 percentage point increase, but a 40% increase. "Percentage points" are absolute differences between two percentages. "Percent increase/decrease" is relative to the starting value. This distinction is important in finance and statistics.
How do I find the original price before GST?
Use the reverse percentage mode. If the price after 18% GST is ₹1,180, the original price is 1180 / 1.18 = ₹1,000. Alternatively: Original = GST-inclusive price ÷ (1 + GST rate). Our GST Calculator also handles this automatically.
How do I calculate percentage of marks?
Use the "What % is X of Y" mode. Enter marks obtained as X and total marks as Y. Example: 450 out of 600 marks = (450/600) × 100 = 75%. For multiple subjects, sum all obtained marks and divide by sum of maximum marks.

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