Percentage Increase / Decrease Calculator
Enter the original and the new value — get the percent change, its direction, and the difference instantly.
How to use
- Enter the original (starting) value.
- Enter the new (ending) value.
- Read the percentage change with an increase/decrease label and the absolute difference.
Examples
Salary raise
From $3,200 to $3,500: the difference is +$300, which is a 9.375% increase.
Price drop
A jacket goes from $120 to $90: the difference is −$30, a 25% decrease.
Traffic growth
Monthly visitors grow from 8,400 to 12,600 — a 50% increase.
FAQ
What is the formula for percentage change?
Percentage change = (new value − original value) ÷ original value × 100. A positive result is an increase, a negative one a decrease.
Why is a $30 drop from $120 a 25% decrease but a $30 rise from $90 a 33% increase?
Because the baseline changes. Percentage change is always measured against the original value: 30 ÷ 120 = 25%, but 30 ÷ 90 ≈ 33.3%.
Percentage change vs. percentage points — what is the difference?
Percentage change is relative: going from 10% to 15% is a 50% increase. Percentage points are absolute: the same move is +5 percentage points. Use points when comparing two percentages directly.
What if the original value is zero?
Percentage change from zero is mathematically undefined (division by zero), so the tool tells you so instead of showing a misleading number. Refer to the absolute difference instead.