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Solve everyday math problems instantly. Calculate percentage increase, decrease, or find exact percentage values.
Our free online Percentage Calculatormakes it effortless to solve the most common percentage-related math problems in everyday life. Whether you're calculating a restaurant tip, figuring out a discount during a sale, analyzing investment growth, or grading assignments — our tool handles it instantly with no mental math required.
A common source of confusion is the difference between a "percentage change" and "percentage points." If an interest rate goes from 5% to 8%, that is an increase of 3 percentage points, but it is a 60% increase in the rate itself (3 is 60% of 5). This distinction matters enormously in finance, economics, and political reporting.
How do I calculate 20% of a number?
Multiply the number by 0.20 (or divide by 5). For example, 20% of 350 = 350 × 0.20 = 70. Use our "What is X% of Y?" calculator above for instant answers.
What is the formula for percentage increase?
Percentage Increase = ((New Value – Old Value) / Old Value) × 100. For example, from 400 to 500: ((500–400)/400) × 100 = 25% increase.
How do I find what percentage one number is of another?
Divide the first number by the second and multiply by 100. For example, 45 out of 200 = (45/200) × 100 = 22.5%.
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