Percentage Decrease Calculator
Calculate percentage decrease between two numbers. Useful for discounts, price drops, reductions, and comparisons.
Result will appear here.
All calculations run locally in your browser. No data is stored.
How it works
Percentage decrease formula: ((old − new) ÷ old) × 100
- Step 1: Subtract the new value from the old value.
- Step 2: Divide the difference by the old value.
- Step 3: Multiply by 100 to get the percentage decrease.
Examples
- Old 120 → New 90 → Decrease = 25%
- Old 200 → New 150 → Decrease = 25%
- Price 80 → 60 → Decrease = 25%
- Stock 50 → 40 → Decrease = 20%
FAQ
- What is percentage decrease?
It measures how much a value has decreased relative to its original old value.
- What if the old value is 0?
The calculation is undefined because it would require division by zero.
- What if the new value is larger than the old value?
That represents an increase, not a decrease. The computed result would be negative.
- Is this used for discounts?
Yes. It can calculate discount percentages and general price reductions.
- Is this accurate?
Yes. It uses the standard mathematical formula for percentage decrease.