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Percentage Calculator – Calculate Any Percentage Online Free

Free percentage calculator: find what is X% of Y, calculate percentage change, or what percent X is of Y. Instant results, no login needed.

No login required ·🆓 100% Free ·📱 Mobile friendly ·⚡ Instant results

💯 Percentage Calculator

📌 What is X% of Y?

Percentage (%)

Of Number (Y)

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📌 X is what % of Y?

Value (X)

Total (Y)

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📌 Percentage Change (Increase / Decrease)

Original Value

New Value

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📌 Common Percentage Examples

15% of 200

20% of 500

100

10% of 80

25% of 400

100

5% of 1000

30 is what % of 150?

20%

% change 80→100

+25%

% change 100→80

−20%

How to Calculate Percentages

A percentage expresses a number as a fraction of 100. The word comes from the Latin per centum — "by the hundred." Percentages are used daily in finance (interest rates, discounts), statistics (survey results), and everyday life (tip calculations, VAT, GST).

📐 Percentage Formulas

What is X% of Y?

Result = (X ÷ 100) × Y

e.g. 15% of 200 = 30

X is what % of Y?

Result = (X ÷ Y) × 100

e.g. 30 ÷ 200 × 100 = 15%

% Change

((New − Old) ÷ Old) × 100

e.g. 100→125 = +25%

💡 Real-World Uses

✅ Shopping discounts — Calculate how much you save on a 20% sale
✅ Tax calculations — Compute GST (18%), VAT (20%), or sales tax
✅ Investment returns — Track portfolio growth percentages
✅ Grade calculations — Convert marks to percentage scores
✅ Tip calculator — Find 15% or 20% tip on restaurant bills
✅ Salary increases — Calculate a 10% raise on your current salary

Percentage Calculator — FAQs

What is the formula for calculating a percentage?

The basic formula is: Percentage = (Part ÷ Whole) × 100. For example, if 30 out of 200 students passed, the pass rate is (30 ÷ 200) × 100 = 15%. To find X% of a number, use: Result = (X ÷ 100) × Number.

How do I calculate a percentage increase or decrease?

Percentage change = ((New Value − Old Value) ÷ Old Value) × 100. If a price rises from ₹100 to ₹125, the increase is ((125−100)÷100) × 100 = 25%. A negative result means a decrease.

What is 15% of 200?

15% of 200 = (15 ÷ 100) × 200 = 30. Use the calculator above for any percentage calculation instantly.

How do I reverse a percentage?

To find the original value before a percentage was applied, divide by (1 + percentage/100). For example, if a price after a 20% increase is ₹120, the original was ₹120 ÷ 1.20 = ₹100.

What is the difference between percentage and percentile?

A percentage expresses a ratio out of 100 (e.g., 75%). A percentile is a ranking position — the 75th percentile means you scored higher than 75% of the population. The two concepts are often confused but are distinct.