Percentage Change Calculator
Measure an increase or decrease relative to an original value, with the signed difference shown.
Loading tool…
How to use Percentage Change Calculator
Percentage change is (new − original) ÷ original × 100. This tool requires a positive baseline so the increase/decrease direction has its usual interpretation.
- Enter original value, new value.
- Check that the input follows the stated limits and uses consistent units.
- Run the calculator, review the result, then copy or download it.
Good to know
- An original value of zero or less is rejected; percentage change from zero is undefined. A new value may be negative.
- Decimal inputs have at most 120 characters and magnitude from 1e-100 to 1e15, or zero. Floating-point results are rounded to 12 significant digits; extreme derived results may underflow or be rejected. Exact integer results are identified separately.
Common questions
What calculation does Percentage Change Calculator perform?
Percentage change is (new − original) ÷ original × 100. This tool requires a positive baseline so the increase/decrease direction has its usual interpretation.
Is this the same as percentage points?
No. A rate changing from 20% to 25% rises by 5 percentage points and by 25% relative to its starting value.
Keep going with related tools
All math →Percentage Points Calculator
Compare two percentage rates using both percentage-point difference and relative percentage change.
CalculatorsPercentage Calculator
Calculate a percentage of any amount, then see the totals after adding or subtracting that percentage.
CalculatorsBasket Price Index Workbench
Build direct and chain-linked price indexes from matched item prices and quantities across your own periods.
CalculatorsWhole-share Issuance and Dilution Scenario
Reconcile named holders before and after primary share issuance with an explicit outstanding or reserve-inclusive denominator.
SEOOffline Organic Search Period Comparison
Compare user-supplied query/page metric extracts with explicit count aggregation, denominators and absent-period evidence.
CalculatorsDimensional Weight Batch Planner
Compare actual and dimensional weight across a package batch using your divisor and rounding rules.