How do I use the Percentage Change Calculator?
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Percentage Change Calculator
Find increase or decrease percentage between two values. Enter your values, review the formula, and use the worked result as a quick check for everyday planning.
Percentage Change Calculator
Find increase or decrease percentage between two values.
Any numeric value
Any numeric value
Results
Absolute change
30
Percentage change
25 %
Formula: Change % = ((new - old) / old) * 100
Percentage Change: Increase or Decrease Between Values
Calculate the percentage increase or decrease from an original value to a new value. This is used for stock price changes, weight loss tracking, price inflation, and any comparison of before-and-after values.
Formula
Change % = ((New Value − Original Value) ÷ Original Value) × 100. If the result is positive, that is the percentage increase. Negative results indicate a decrease. Absolute change shows the raw difference.
Worked example
Original 120, new 150: absolute change = +30, percentage change = +25%. Original 200, new 160: absolute change = −40, percentage change = −20%.
Practical guidance
Interpreting negative values
A negative percentage change means a decrease. Original 100 dropping to 80 is a −20% change. The calculator shows both the absolute and percentage changes so you can see both the raw and relative shifts.
Starting from zero or near-zero values
If the original value is zero or very small, percentage change can be misleading or undefined. Going from 0 to 10 is technically an infinite percentage increase. Interpret such cases with context rather than the raw percentage.
Frequently asked questions
What formula does this calculator use?
Change % = ((new - old) / old) * 100
Can I use decimal values?
Yes. Decimal inputs are supported for most calculators. Integer-based tools use rounded integer values where appropriate.
Is this calculator free?
Yes. CalcuNimble calculators are free and optimized for fast everyday use.