Percentage Calculator

Calculate percentages, percentage change, and more with 5 modes

% X% of Y

What is % of ?
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Formula: X% × Y = Result

% % of What

is what % of ?
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Formula: (X ÷ Y) × 100 = %

% % Change

From Value To Value
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Formula: ((New − Old) ÷ Old) × 100 = %

% % Increase

% to Add %
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Formula: X × (1 + P/100) = Result

% % Decrease

% to Subtract %
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Formula: X × (1 − P/100) = Result

About this Calculator

The Percentage Calculator is a free, easy-to-use tool for percent, change, difference. Simply enter your values and get instant, accurate results — no signup required. All calculations run locally in your browser, so your data stays completely private.

Privacy Note: All calculations are performed locally in your browser. No data is ever sent to a server or third party.

Percentage Calculator FAQ

How do I calculate a percentage of a number?
Multiply the number by the percentage divided by 100. For example, 20% of 50 is calculated as 50 × 0.20 = 10.
What is the percentage change formula?
Percentage change = (new value − old value) ÷ old value × 100. A positive result indicates an increase; negative means decrease.
How do I find what percent one number is of another?
Divide the part by the whole, then multiply by 100. For example, 25 out of 200 is calculated as (25 ÷ 200) × 100 = 12.5%.
What's the difference between percent and percentage point?
Percent expresses a ratio relative to 100. Percentage point refers to the arithmetic difference between two percentages (e.g., 30% to 35% is a 5-point increase), not the same as a relative percent change.