Free Online Calculator Tool

Percentage Calculator: Find %, Increase/Decrease & Fractions

Free online percentage calculator. Instantly calculate what percent one number is of another, find percentage increase/decrease, and solve what is X% of Y.

Find a Percentage of a Number

What is
%
of
?
30

Find What Percentage One Number is of Another

is what percent of
?
20%

Calculate Percentage Increase or Decrease

Change from
to
50% Increase

How to Calculate Percentages?

The word "percent" simply means "per 100" or "out of 100". A percentage is a fraction with a denominator of 100.

Formula 1: What is P% of X?

To find a percentage of a number, divide the percentage by 100 and multiply it by the number.
Formula: (P / 100) × X = Y

Formula 2: X is what percent of Y?

To find out what percentage one number is of another, divide the first number by the second and multiply by 100.
Formula: (X / Y) × 100 = P%

Formula 3: Percentage Increase or Decrease

To find the percentage change from X to Y, subtract the old value from the new value, divide by the absolute value of the old value, and multiply by 100.
Formula: ((Y - X) / |X|) × 100 = Change%