Instantly find the percentage increase or decrease between any two numbers.
The starting or "before" value
The ending or "after" value
Percentage change measures how much a value has grown or shrunk relative to its original size. A positive result is an increase; a negative result is a decrease. It is one of the most widely used calculations in finance, science, and everyday life — from comparing prices to tracking weight loss.
The vertical bars around Original Value mean you use its absolute value (ignore the minus sign if it is negative). The result is expressed as a percentage.
A jacket cost $80 last year and costs $100 this year.
The price increased by 25%.
Someone weighed 200 lb and now weighs 175 lb.
Body weight decreased by 12.5%.
Monthly revenue went from $4,200 to $5,880.
Revenue grew by 40%.
| Original | New | Change | Direction |
|---|---|---|---|
| 100 | 125 | +25% | Increase |
| 100 | 75 | −25% | Decrease |
| 50 | 100 | +100% | Doubled |
| 200 | 50 | −75% | Decrease |
| 1,000 | 1,500 | +50% | Increase |
| 80 | 80 | 0% | No change |
Percentage change = ((New Value − Original Value) ÷ |Original Value|) × 100. A positive result means an increase; a negative result means a decrease.
Percentage change compares a new value to an original value with direction (increase or decrease). Percentage difference compares two values symmetrically, without a direction, using the average of the two values as the denominator.
Percentage change is undefined when the original value is zero, because you cannot divide by zero. If your original value is 0, consider using the absolute difference instead.
Yes. For example, if a price goes from $50 to $150, that is a 200% increase. Percentage change has no upper or lower limit.
To reverse a known percentage change back to the original value, divide the new value by (1 + percentage/100). For example, if $120 is a 20% increase, the original value is 120 ÷ 1.20 = $100.
No. A 50% decrease followed by a 50% increase does not return to the original. Example: 100 → −50% → 50 → +50% → 75. The two moves are not symmetrical.