Percentage Change Calculator
Calculate the percentage increase or decrease between two values.
Recommended Books on Mathematics
How Not to Be Wrong
Jordan Ellenberg
Naked Statistics
Charles Wheelan
The Art of Statistics
David Spiegelhalter
As an Amazon Associate we earn from qualifying purchases.
How do you like this tool?
How to Use
Enter Original Value
Type the starting value into the first field.
Enter New Value
Type the new or final value into the second field.
Read the Change
The percentage change is shown instantly, colored green for increase or red for decrease.
Use Cases
Price Changes
"Calculate how much a product price has increased or decreased over time."
Investment Returns
"Determine the percentage gain or loss on an investment."
Grade Improvement
"See how much a student's score has improved between two exams."
Professional Products to Boost Your Math Skills
TI-84 Plus CE Color Graphing Calculator, Black
Texas
fx-CG50-N Color Graph Scientific Calculator
Casio
Prime G2 Graphing Calculator – Multi-Touch 3.5" Color Display CAS Exam Approved SAT/AP/IB Scientific Calculator for Scho
HP
As an Amazon Associate we earn from qualifying purchases.
Frequently Asked Questions
?How is percentage change calculated?
Percentage change = ((New Value − Original Value) / |Original Value|) × 100. A positive result means an increase; negative means a decrease.
?What if the original value is zero?
Percentage change is undefined when the original value is zero because you would be dividing by zero.
?Can I compare negative values?
Yes. The calculator uses the absolute value of the original to compute the change, so negative starting values work correctly.
?What is the difference between percentage change and percentage points?
Percentage change is relative (e.g., from 10% to 15% is a 50% increase), while percentage points measure the absolute difference (5 percentage points).
?Can I calculate compound percentage change?
This tool calculates single-period change. For compound growth, you would need to apply the formula repeatedly.
?Is my data private?
Yes. Everything runs locally in your browser. No data is sent to any server.
?Is this tool free?
Yes. Completely free with no limits, no sign-up required.