Percentage Calculator

Calculate percent of a number, percentage share, and percentage increase or decrease for everyday math.

All processing happens locally in your browser. Your input is never sent to a server or saved by Wraplet.

Calculation

First value

Second value

Percentage result

Formula or method

X% of Y = Y x X / 100

X is what % of Y = X / Y x 100

Percentage change = (new value - old value) / old value x 100

The first and second values change meaning based on the selected mode. For percentage change, use the old value first and the new value second.

The result is shown as a number or percent depending on the selected calculation mode.

Work out discounts, markups, grade percentages, budget shares, growth, or decrease between two numbers.

Choose the percentage calculation type: percent of a number, what percent one value is of another, or percentage change.

Enter the two values in the fields provided.

Read the result and the matching formula note to confirm how the percentage was calculated.

Fifteen percent of 200 is 30 because 200 x 15 / 100 = 30.

Mode: What is X% of Y? First value 15, second value 200

Choose 'What is X% of Y?', enter 15 as the first value and 200 as the second value. The result is 30.

Choose 'X is what % of Y?', enter the part as the first value and the whole as the second value.

Percentage change compares a new value with an old value using (new - old) / old x 100.

A percentage share or change cannot be calculated when the comparison value is zero because division by zero is undefined.

Calculate exact age from a date of birth to today or any comparison date, with years, months, days, and total days.