Percentage Change Calculator
Find the percentage increase or decrease between any two numbers. Works for prices, scores, populations — anything with a starting and ending value.
How to Calculate Percentage Change
Percentage change measures how much a value has grown or shrunk relative to its original amount.
A positive result means the value went up (increase). A negative result means it went down (decrease).
Examples
Price increase: A product goes from $80 to $100.
((100 − 80) ÷ 80) × 100 = +25%
Price decrease: A stock drops from $200 to $150.
((150 − 200) ÷ 200) × 100 = −25%
Salary raise: Salary goes from $50,000 to $57,500.
((57,500 − 50,000) ÷ 50,000) × 100 = +15%
Percentage Change vs Percentage Difference
Percentage change has a direction — you go from an original value to a new value. The original value is your reference point. Percentage difference, on the other hand, doesn't care about order — it uses the average of the two values as the reference.
Common Questions
What is the percentage change from 50 to 75?
((75 − 50) ÷ 50) × 100 = 50%. The value increased by 50%.
Can percentage change be more than 100%?
Yes. If a value doubles (e.g., from 50 to 100), the change is 100%. If it triples, the change is 200%. There is no upper limit for percentage increase, but the maximum decrease is −100% (to zero).
What if the original value is zero?
Percentage change is undefined when the original value is zero, because you'd be dividing by zero. In this case, you can only state the absolute change.
How do I reverse a percentage change?
Use the Reverse Percentage Calculator. Enter the final value and the percentage change that was applied to find the original amount.