Percentage Change Calculator
Calculate the percentage change between two values, percent difference, cumulative compounded change, CAGR, fold change, and log change.
Percentage Change
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Absolute Change —
Direction —
Extended More scenarios, charts & detailed breakdown ▾
Percent Change
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Absolute Change —
Direction —
Professional Full parameters & maximum detail ▾
%
Reverse Calculation
New Value (Original × (1 + %/100)) —
Year-over-Year Rate Needed —
CAGR & Growth
CAGR (Start → End over N years) —
Fold Change (End / Start) —
Log Change (ln(End/Start)) —
How to Use This Calculator
Enter the Original Value and New Value to get the percentage change, absolute change, and direction. Use the Extended tabs for percent difference (symmetric) or cumulative compounded change across three sequential steps. The Professional tab adds reverse calculation, CAGR, fold change, and log change.
Formula
% Change = ((New − Original) / |Original|) × 100
% Difference = |A − B| / avg(A, B) × 100
CAGR = (End/Start)^(1/n) − 1
Example
Original = 80, New = 100 → Change = +25% | Percent Difference = 22.22% | CAGR from 1000→2000 in 5 years ≈ 14.87%/yr
Frequently Asked Questions
- The Percentage Calculator answers "what is X% of Y?" This calculator specifically computes the change between two values — how much something increased or decreased in percentage terms.
- Percentage change = ((New − Original) / |Original|) × 100. A positive result is an increase; negative is a decrease.
- Percent change is directional (from A to B). Percent difference is symmetric: |A−B| / average(A,B) × 100. Use percent difference when there is no clear "original" value.
- CAGR (Compound Annual Growth Rate) = (End/Start)^(1/n) − 1, where n is the number of years. It gives the steady annual rate that would produce the same total growth.
- Fold change = End / Start. A fold change of 2 means the value doubled. It is common in biology and science to express relative changes.