What is Percentage Change Calculator?
The percentage change calculator is a free online tool. Enter the initial and final values to compute the percent change between them, along with the absolute difference and final value. It also supports reverse modes for "increase by %" and "decrease by %", suitable for stock moves, price changes, sales growth, exam scores, and any percentage scenario. All calculations run locally in your browser — nothing is uploaded.
▶Use Cases5 scenarios
- ◆Stock and investment change
- ◆Price change analysis
- ◆Sales growth tracking
- ◆Exam score comparison
- ◆Budget vs actual variance
▶How to Use4 steps
- 1Choose a mode (change/increase/decrease)
- 2Enter the initial value
- 3Enter the final value or percentage
- 4Click calculate to see results
▶Features5 features
- ✓Three calculation modes
- ✓Instant results
- ✓Absolute and percent shown together
- ✓Browser-based
- ✓Free to use
▶FAQ7 questions
What is the Percentage Change Calculator?
An online math tool. Input: an initial value and a final value. Output: the percentage change, absolute difference, and new value, with increase/decrease reverse modes. Use it for stock moves, price changes, and sales growth.
How do you calculate percentage change?
Formula: (Final - Initial) ÷ Initial × 100%. For example, going from 100 to 150 is (150-100)÷100×100% = 50%.
What is the difference between percentage change and percentage points?
Percentage change is relative to the initial value, while percentage points are an absolute difference. If a rate goes from 5% to 10%, that is a 100% change but only a 5 percentage-point difference.
What if the initial value is zero?
Percent change is undefined when the initial value is zero (division by zero). Use the absolute difference instead.
Does it support negative values?
Yes. The tool handles negative initial values correctly and uses the absolute value as the base for percentage calculations.
How accurate is the calculator?
It uses IEEE 754 double-precision arithmetic and rounds to 10 decimal places — plenty of precision for daily use.
Is my data private?
Yes. Everything runs locally in your browser and no data is ever uploaded.