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Free online calculator

Percentage calculator

Solve any percentage in seconds.

Solve common percentage questions

Switch modes and enter two numbers. The result updates as you type.

Question type
%
Answer 30

15% of 200 is 30.

How to use this calculator

  1. 1

    Pick a question

    Choose the percentage mode that matches your problem.

  2. 2

    Enter two values

    Fill in the two visible number fields.

  3. 3

    Read the answer

    Use the sentence result to avoid mixing up values.

Formula

Percent of a value: answer = value x percent / 100

What percent: answer = part / whole x 100

Percent change: answer = (new - old) / old x 100

Use the mode that matches the missing piece, then keep the original value in the denominator for change questions.

Worked example

Checking a grocery discount:

If a $200 basket is reduced by 15%, the savings are 200 x 15 / 100 = 30. The discount is $30 before any tax or fees.

FAQ

How do you calculate a percentage of a number? +

Calculate a percentage of a number by multiplying the number by the percentage divided by 100. For example, 15% of 200 is 30.

How do you find what percent one number is of another? +

Find what percent one number is of another by dividing the part by the whole and multiplying by 100. If 30 is the part and 200 is the whole, the answer is 15%.

How do you calculate percentage increase? +

Calculate percentage increase by subtracting the old value from the new value, dividing by the old value, and multiplying by 100. A move from 80 to 100 is a 25% increase.

How do you calculate percentage decrease? +

Calculate percentage decrease with the same percent-change formula when the new value is smaller. A move from 100 to 80 is a 20% decrease.

Can a percentage be more than 100? +

Yes, a percentage can be more than 100 when the part is larger than the whole or when a value more than doubles. For example, 250 is 125% of 200.

About this calculator

This percentage calculator answers the three questions people ask most: what is a percent of a number, what percent one number is of another, and how much a value increased or decreased. It is useful for bills, discounts, budgets, and quick financial checks.

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Turn percent checks into better spending decisions

When a bill jumps or a discount looks suspicious, Spendspace helps you log the amount and see how it affects your monthly budget.

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