Percentage Calculator: Percent of a Number, Increase, Decrease & Change

Use this free percentage calculator to find what percent one number is of another, calculate percentage increase or decrease, and solve mixed fraction percentage problems instantly in your browser.

Calculate Percentages Online

Solve common percentage problems, including percent of a number, percentage change, percentage increase, percentage decrease, and mixed fraction percentages.

? is what % of ?

Answer:

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Formula: A / B × 100

? What is % of ?

Answer:

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Formula: A × B / 100

? is % of what?

Answer:

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Formula: A / (B / 100)

? % change from to ?

Answer:

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Formula: (B − A) / A × 100

? % of mixed fraction

Answer:

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Formula: (W × D + N) / D × 100

? × % ?

Answer:

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Formula: A × B / 100

? ÷ % ?

Answer:

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Formula: A / (B / 100)

? Increase by %

Answer:

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Formula: A × (1 + B / 100)

? Decrease by %

Answer:

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Formula: A × (1 − B / 100)

Common Percentage Formulas

These are the same formulas used by the calculator above, which helps both visitors and search engines understand what this page covers.

What percent is A of B: A / B × 100
What is A% of B: A × B / 100
A is B% of what number: A / (B / 100)
Percentage change from A to B: (B − A) / A × 100
Increase A by B%: A × (1 + B / 100)
Decrease A by B%: A × (1 − B / 100)

Percentage Calculator FAQs

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

Use the first calculator to divide A by B and multiply by 100. For example, if A is 25 and B is 200, the result is 12.5%.

How do I calculate a percentage increase or decrease?

Enter the starting value and the percentage in the increase or decrease calculators. The page multiplies the starting value by 1 plus or minus the percentage as a decimal.

Can this calculator handle decimals and mixed fractions?

Yes. You can enter decimal values in the percentage tools, and the mixed fraction calculator lets you combine a whole number, numerator, and denominator to convert a mixed fraction into a percentage.