Percentage Change Calculator

Measure a percentage increase or decrease from a starting value. Enter your own values below to see percentage change and check the method behind it.

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Your inputs

Change the example values to match your situation.

Your result

Let’s work it out.

Fill in your inputs and select Calculate.
Your result and breakdown will appear here.

How this calculator works

Change = (new − original) ÷ absolute original × 100.

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What is Percentage Change Calculator?

Percentage Change Calculator helps you measure a percentage increase or decrease from a starting value.

The main result is percentage change. The formula, example and assumptions below explain how to interpret it.

How to use Percentage Change Calculator

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather original value and new value. Use values from the same situation or reporting period.
  2. Replace the example original value with your own value, then complete the other fields. Check the displayed units.
  3. Select Calculate and read percentage change. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter original value, at least -1000000000000. Decimals are accepted.
  • Enter new value, at least -1000000000000. Decimals are accepted.

Percentage Change Calculator: a worked example

With the inputs below, the result is 25 % (percentage change). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Original value100
New value125
Percentage change25 %

Understanding the Percentage Change result

The main output is percentage change, expressed in %. It applies to the inputs and operation you selected.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

Percentage Change Calculator: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • Check the base value, sample definition and chosen operation. Display rounding should come after the calculation.

For wider guidance, visit NIST statistical handbook. The formula and scope of this specific tool are stated on this page.

Percentage Change Calculator FAQs

What does Percentage Change Calculator calculate?

Percentage Change Calculator helps you measure a percentage increase or decrease from a starting value. Its main output is percentage change in %.

What inputs do I need for Percentage Change Calculator?

You need original value and new value. Use the field labels and units to match your figures to the formula.

Which formula does Percentage Change Calculator use?

Change = (new − original) ÷ absolute original × 100.

What is a worked example for Percentage Change Calculator?

Example inputs: Original value: 100; New value: 125. The result is 25 % (percentage change).

How should I enter original value?

Enter original value, at least -1000000000000. Decimals are accepted.

How do I choose new value?

Enter new value, at least -1000000000000. Decimals are accepted. The example uses 125; replace it if your circumstances differ.

How should I read percentage change?

The main output is percentage change, expressed in %. It applies to the inputs and operation you selected.

Why might my Percentage Change Calculator result differ from my records?

Check the base value, sample definition and chosen operation. Display rounding should come after the calculation. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in Percentage Change Calculator?

Yes. Note your first percentage change, change original value or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is Percentage Change Calculator free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.