This calculator helps you quickly calculate the percentage increase or decrease between two values.
It is widely used in finance, ecommerce, pricing, analytics, and everyday calculations.
Understanding percentage change is essential for tracking growth, comparing values, and making better decisions.
Whether you're analysing sales performance, price changes, or investment returns, this tool provides instant and accurate results.
A positive result means an increase, while a negative result means a decrease.
The percentage is always calculated relative to the original value, not the new value.
This makes it a powerful way to compare changes over time or between values.
Formula: ((New − Old) ÷ Old) × 100
The calculator measures the difference between the two values and expresses it as a percentage of the original value.
Example 1:
£100 → £120 = 20% increase
Example 2:
£80 → £60 = 25% decrease
Example 3 (Business):
Sales increase from £5,000 to £6,500 = 30% growth
Example 4 (Discount):
£50 reduced to £40 = 20% decrease
Subtract old from new, divide by old, multiply by 100.
Same formula but result is negative.
No, division by zero is not possible.