# PERCENTAGE CHANGE CALCULATOR

### Calculate the percent change between two numbers

Percent Change

This tool enables you to calculate the percentage change between two values like the increase of a rent or of a production.

CALCULATOR

First value:

Second value:

Our percent calculator uses this formula:

((y2 - y1) / y1)*100 = your percentage change
(where y1=first value and y2=second value)

Calculate the percentage increase of the rent

Your rent has just increased. It rose from USD 789 to USD 807.46, an increase of just under USD 20. What is the increase in percentage?

(807,46 − 789) / 789 × 100 = 18.46 ÷ 789 × 100 = 2,339

Your rent has increased by 2.34%. We can verify that: 789 × 1,0234 = 807,46

Calculate the production decline in percentage

The production of a company diminishes from 2,345 pieces per day to 1,870 pieces per day. What is the percentage decrease in production of this company?

(1 870 − 2 345) / 2 345 × 100 = −20.256

The decrease in production is equal to -20.26%. We can verify that: 2,345 × (1 - 20,26 ÷ 100) = 2,345 × 0,7974 = 1,870 rounded to the nearest unit.

How to determine the percentage of a reduction

A seller gives you a discount of 30 € on a household electrical appliance to 210 €. What is the percentage reduction? You will pay 180 € instead of the 210 € requested. The tool gives us:

(180 − 210) ÷ 210 × 100 = −14,29. The change from 210 to 180, in percentage, represents a decrease of -14.29% of 210.

Calculate the evolution in percentage of negative values

In order to calculate the change in percentage on negative values, one must take the absolute value of the initial value:
(new-old) / |old|.

A temperature drops from -20 degrees Celcius to -45 degrees Celcius. What is the percent change?
(-45 – (-20)) / 20 * 100 = 125
The temperature has dropped by 125%.
We can verify: 125% of 20 degrees Celcius represents 25 degrees Celcius. This gives -20 – 25 = -45 degrees.