How do I calculate a percentage?

To find X% of Y, multiply Y by X/100. Example: 25% of 80 = 80 × 0.25 = 20. To express A as a percent of B, divide A by B and multiply by 100.

How do I calculate my percentage?

Divide your value by the total, then multiply by 100. Example: scoring 42 out of 50 = (42 ÷ 50) × 100 = 84%.

What is percent change?

Percent change = ((new − old) ÷ old) × 100. A positive value is an increase, a negative value is a decrease. Example: 50 → 65 is a 30% increase.

Calculate Percentage Online

Three quick percentage calculators in one page

1. What is X% of Y?

What is % of ?

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2. A is what % of B?

is what % of ?

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3. % change from old to new

From to

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How to Calculate a Percentage

A percentage is a fraction of 100. To calculate X% of Y, multiply Y by X ÷ 100 (so 20% of 80 = 80 × 0.20 = 16). To express A as a percentage of B, divide A by B and multiply by 100 (42 of 50 = 84%). For percent change, take the difference, divide by the original, and multiply by 100.

When You'd Calculate My Percentage

Common uses include exam grades (your score ÷ total points × 100), tip and tax calculations, sale prices and discounts, statistics and survey results, fitness goals (weight or distance progress), savings rates, and project completion. The three calculators above cover ≈ 95% of everyday percentage tasks.

Other Percent Tools

Need something specific? Try the grade calculator for tests, percentage change for before/after comparisons, fraction → % for ratio conversions, or 10% of / what is X% of Y for fixed-format quick answers.

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