What is X% of Y?

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

Percentage (%)

% of

Number

Result

—

X is what percent of Y?

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

Part (X)

out of

Total (Y)

Result

—

Percentage Change

Find the % increase or decrease between two values.

Original Value

→

New Value

Percentage Change

—

Reverse Percentage

Find the original value before a percentage was applied.

Final Value

after

Percentage Applied (%)

Original Value

—

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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.

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Quick Tip

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

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). E.g., if price after 20% increase is ₹120, original = 120 ÷ 1.2 = ₹100.

Percentage Calculator

Basic Formula

% Increase

Quick Tip

Frequently Asked Questions

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