Percentage Change Calculator
Calculate the percentage change between two values. Works for both increases and decreases. Perfect for tracking changes over time.
What is Percentage Change?
Percentage change measures the relative change between two values, expressed as a percentage. It shows how much a value has increased or decreased relative to its original value.
Unlike percentage increase (which only works for increases), percentage change works for both increases and decreases, making it more versatile for tracking changes over time.
How to Use the Percentage Change Calculator
- Enter old value: Input the original or starting value.
- Enter new value: Input the final or new value.
- Calculate: Click "Calculate Change" to see the percentage change and absolute change.
Common Use Cases
Price Changes
Track how prices have changed. Example: £100 to £120 = +20% change, £100 to £80 = -20% change.
Performance Metrics
Measure changes in sales, revenue, or other business metrics over time periods.
Stock Prices
Calculate how much stock prices have changed. Positive values show gains, negative show losses.
Population Changes
Track population growth or decline over time periods.
Frequently Asked Questions
What's the difference between percentage change and percentage increase?
Percentage increase only works for increases (new value > old value), while percentage change works for both increases and decreases, showing negative values for decreases.
How is percentage change calculated?
Percentage change = ((New Value - Old Value) / Old Value) × 100. This gives a positive value for increases and negative for decreases.
What does a negative percentage change mean?
A negative percentage change indicates a decrease. For example, -20% means the value has decreased by 20% from the original.
Can the old value be zero?
No, the old value cannot be zero because division by zero is undefined. If you're starting from zero, you can't calculate a meaningful percentage change.
Related Calculators
Cite This Calculator
Reference this calculator on your website or in your work using the citation below:
HTML Citation Code:
<p>Calculator: <a href="https://onlinecalculator.co.uk/percentage/percentage-change-calculator" target="_blank">Percentage Change Calculator</a> - OnlineCalculator.co.uk</p>APA Style Citation:
OnlineCalculator.co.uk. (2025). Percentage Change Calculator. Retrieved from https://onlinecalculator.co.uk/percentage/percentage-change-calculatorNote: This calculator is free to use and reference. No permission required for educational or commercial citation.