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% Percentage Calculator

Five types of percentage calculations in one place — instant results with step-by-step formula explanations.

1

What is X% of Y?

Find a percentage of any number — e.g. "What is 20% of 500?"

What is % of =
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2

X is what % of Y?

Find what percentage one number is of another — e.g. "100 is what % of 500?"

is what % of =
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%
3

X is Y% of what?

Find the whole when you know a part and its percentage — e.g. "100 is 20% of what?"

is % of what? =
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4

Percentage Change (Increase / Decrease)

Calculate how much a value increased or decreased in percentage terms.

From to =
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%
5

Percentage Difference Between Two Numbers

Compare two values symmetrically — useful when neither is a fixed reference point.

Difference between and =
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%

🕐 Calculation History

No calculations yet — results will appear here.

📐 Percentage Formulas — Quick Reference

X% of Y
Result = (X ÷ 100) × Y
e.g. 20% of 500 = 100
X is what % of Y
Result = (X ÷ Y) × 100
e.g. 100 of 500 = 20%
Percentage Change
((New − Old) ÷ Old) × 100
e.g. 200 → 250 = +25%
Percentage Difference
|A − B| ÷ ((A + B) ÷ 2) × 100
e.g. 80 vs 100 = 22.22%
FAQ

Frequently Asked Questions

A percentage is a way to express a number as a fraction of 100. The word "percent" means "per hundred." For example, 25% means 25 out of every 100, or 0.25 as a decimal. Percentages are used everywhere — discounts, interest rates, exam scores, GST, and more.
Percentage change compares a new value to an original (reference) value — it shows increase or decrease from a starting point. Percentage difference compares two values without a reference point, using their average as the base. Use percentage change for "before vs after" comparisons; use percentage difference when both values are equally valid.
Use Calculator 1 (What is X% of Y). Enter the discount % and the original price. The result is the discount amount. Subtract it from the original price to get the final price. E.g. 20% of ₹1,000 = ₹200 discount — you pay ₹800.
Use Calculator 1. Enter the GST rate (e.g. 18) and the base price. The result is the GST amount. Add it to the base price for the total. E.g. 18% of ₹1,000 = ₹180 GST — total payable ₹1,180.
Use Calculator 4 (Percentage Change). Enter your old salary as "From" and your new salary as "To." The result shows the exact percentage increase. E.g. from ₹50,000 to ₹60,000 = 20% increase.

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