What is X% of Y?

Percentage (X%)

Enter the percentage value

Number (Y)

Enter the number

X is what % of Y?

Value (X)

Enter the value

Total (Y)

Enter the total (cannot be zero)

From (X)

Enter the original value (cannot be zero)

To (Y)

Enter the new value

This calculator supports three percentage operations. Select the tab for the calculation you need:

X% of Y -- Enter a percentage and a number to find the result. For example, 25% of 200 = 50.
X is what % of Y -- Enter two numbers to find what percentage the first is of the second. For example, 50 is 25% of 200.
% Change -- Enter a starting and ending value to find the percentage increase or decrease. For example, 100 to 150 = +50%.

Result = (X / 100) * Y

Result = (X / Y) * 100

Result = ((Y - X) / X) * 100

How do I calculate a percentage of a number?

To find X% of Y, divide X by 100 and multiply by Y. For example, 15% of 300 is (15 / 100) * 300 = 45.

What is the percentage change formula?

Percentage change = ((New Value - Old Value) / Old Value) * 100. A positive result means an increase; a negative result means a decrease.

Can I calculate percentage change from zero?

No. Percentage change from zero is mathematically undefined because you would be dividing by zero. The calculator will display an error in this case.

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

Divide the part by the whole and multiply by 100. For example, to find what percent 30 is of 120: (30 / 120) * 100 = 25%.

Does this calculator work with negative numbers?

Yes. All three modes support negative numbers. For example, -20% of 50 = -10, and the percentage change from 200 to 100 = -50%.