Math

Percentage Calculator

Find a percentage of a number, including the result after adding or subtracting it.

Enter your values

Percentage amount

37.5

An estimate based on your inputs. Review the assumptions and method below.

A percentage describes a share out of one hundred. Enter an amount and a percentage to see that share and the effect of adding or subtracting it.

Percentage amount = base amount × percentage ÷ 100

Percentages above 100% and negative numbers are supported for mathematical calculations.

What is 15% of 250?

It is 37.5. Adding it gives 287.5, and subtracting it gives 212.5.

Is this the percentage change between two numbers?

This calculator finds a percentage of a base amount. Percentage change is the difference divided by the original value, multiplied by 100.

To find 15% of 250, convert the percentage to a decimal: 15 ÷ 100 = 0.15.
Multiply 250 × 0.15 = 37.5.
Adding that amount gives 287.5; subtracting it gives 212.5. This finds a percentage of an amount, not the percentage change between two amounts.

This example is separate from the values you entered above.

Sources explain the method or its limits; they do not imply that the linked organizations endorse this calculator.