Percentage Change Calculator
Enter a before value and an after value to find the percentage change — positive for an increase, negative for a decrease. Used in reporting, dashboards, and financial analysis whenever you need to show how much something moved and in which direction. This is distinct from percentage difference, which has no direction — use this calculator specifically when one value came before the other.
When to use this calculator
Use this for any before/after comparison — quarterly revenue figures, monthly active users, stock price movements, test scores across two attempts, or year-over-year expenses. Works for both increases and decreases in a single calculation.
Percentage Change
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Results are instant — nothing is stored and no account is needed.
Related Calculators
How to Calculate
- Enter the original (before) value in the first field.
- Enter the new (after) value in the second field.
- The percentage change and direction appear instantly.
Formula
Subtract the original from the new value. Divide by the original, then multiply by 100. Positive = increase, negative = decrease.
Examples
From 40 to 50
+25%
From 120 to 90
−25%
From 80 to 92
+15%
Use Cases
- Reporting monthly or quarterly revenue changes
- Measuring growth or decline in website traffic
- Comparing prices between two time periods
- Tracking KPI performance in business dashboards
- Calculating year-over-year financial changes
FAQ
What is the percentage change from 50 to 75?
The percentage change from 50 to 75 is +50%. Calculation: ((75 − 50) / 50) × 100 = 50.
What is the percentage change from 100 to 80?
The percentage change from 100 to 80 is −20%. Calculation: ((80 − 100) / 100) × 100 = −20.
What is the difference between percentage change and percentage difference?
Percentage change is directional — it measures how much a value moved from a starting point to an end point, and whether it went up or down. Percentage difference compares two values symmetrically with no concept of "before" or "after". Use percentage change for time-series data; use percentage difference when neither value is the baseline.
Can percentage change be negative?
Yes. A negative result means the value decreased. A positive result means it increased. The sign is the key indicator of direction.
What is the percentage change from 200 to 200?
The percentage change is 0% — no change occurred.
What is the percentage change from 0 to any number?
Technically undefined — you cannot divide by zero. If your starting value is zero, percentage change has no mathematical meaning. Use absolute difference (subtract the values) to describe the change instead.