A percentage is a way of expressing a number as a fraction of 100. Whether you need to find a discount, calculate tax, measure growth, or split a bill — percentages appear everywhere in daily life. Choose a tab below and get your answer in real time, with the formula shown.

What is X% of Y?

Find a percentage of any number. e.g. What is 15% of 200?

Percentage (%)

% of

Number

Result

—

e.g. 20% of 500 = 100

X is what percent of Y?

e.g. 30 is what percent of 150? Answer: 20%

Part (X)

out of

Total (Y)

Result

—

e.g. 30 out of 150 = 20%

Percentage Change

Find the % increase or decrease between two values.

Original Value

→

New Value

Percentage Change

—

e.g. 80 → 100 = +25% increase

Reverse Percentage

Find the original value before a percentage was applied.

Final Value

after

Percentage Applied (%)

Original Value

—

e.g. ₹120 after 20% increase → original = ₹100

Add a Percentage

Increase a number by a percentage. Useful for adding tax, markup, or tip.

Number

Add (%)

Result after adding

—

e.g. Add 18% to 500 = 590

Subtract a Percentage

Decrease a number by a percentage. Useful for applying discounts.

Number

−

Subtract (%)

Result after subtracting

—

e.g. 20% off ₹500 = ₹400

📐

Basic Formula

Percentage = (Part ÷ Total) × 100. Divide the part by the whole and multiply by 100.

📈

% Increase

% Increase = ((New − Old) ÷ Old) × 100. Positive result = growth; negative = decrease.

💡

Quick Tip

To find 10% of any number, move the decimal one place left. 10% of 350 = 35.

Choose the type of percentage calculation using the tabs above
Enter numbers in the input fields — results update in real time as you type
The formula used is shown below the result for full transparency
A quick example is shown to help verify your answer
All calculations run locally in your browser — nothing is sent to a server

Example 1: Find 15% of ₹4,800

Formula: (15 ÷ 100) × 4800 = 0.15 × 4800 = ₹720

Answer: ₹720 — use the "X% of Y" tab

Example 2: Price rose from ₹800 to ₹960 — what % increase?

Formula: ((960 − 800) ÷ 800) × 100 = (160 ÷ 800) × 100 = 20%

Answer: 20% increase — use the "% Change" tab

Frequently Asked Questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 25% of 80 = (25 × 80) ÷ 100 = 20. Use the "X% of Y" tab above for instant results.

How do I find what percentage one number is of another?

Divide the part by the whole and multiply by 100. Example: 30 out of 150 = (30 ÷ 150) × 100 = 20%. Use the "X is what % of Y?" tab.

What is percentage increase and decrease?

Percentage change = ((New Value − Old Value) ÷ Old Value) × 100. A positive result is an increase, negative is a decrease. Use the "% Change" tab to calculate this instantly.

How do I find the original value before a percentage was added?

Use the Reverse Percentage tab. Original = Final Value ÷ (1 + percentage÷100). For example, if a price after a 20% increase is ₹120, the original = 120 ÷ 1.2 = ₹100.

How do I add or subtract a percentage from a number?

To add: result = number × (1 + percent÷100). To subtract: result = number × (1 − percent÷100). For example, adding 10% to ₹500 = 500 × 1.1 = ₹550. Use the "Add %" or "Subtract %" tabs above.

Percentage Calculator

Basic Formula

% Increase

Quick Tip

Example 1: Find 15% of ₹4,800

Example 2: Price rose from ₹800 to ₹960 — what % increase?

Frequently Asked Questions

Related Calculators