__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**

Second value:

Our percent calculator uses this formula:

((y2 - y1) / y1)*100 = your percentage change

(where y1=first value and y2=second value)

__Examples__

__1. 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

__2. Calculate the production decline in percentage__The production of a company diminishes from 2345 pieces per day to 1870 pieces per day. What is the percentage decrease in production of this company?

(1870 - 2345) / 2345 × 100 = −20.256

The decrease in production is equal to -20.26%. We can verify that: 2345 × (1 - 20.26 / 100) = 2345 × 0.7974 = 1870 rounded to the nearest unit.

__3. How to determine the percentage of a reduction__A seller gives you a discount of 30 USD on a household electrical appliance to 210 USD. What is the percentage reduction? You will pay 180 USD instead of the 210 USD 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.

We can verify that: 210 x (1 - 14.29 /100) = 210 x 0.8571 = 180.

__4. 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.

__Other percent calculations__These free calculators compute a number of values involving percentages.

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With this handy percent calculator it is easy to find the percent of any number. The percent guessing game is over once and for all. The calculators are on an easily accessible website with a minimal download time, so you can use the percent calculator even on a not so up-to-date smartphone without a problem.

All you have to do is enter your values, click on the calculate-button and the percentage calculator will do the rest for you in no time.