Find Percentage Decrease
Enter an original value and a new value to calculate the decrease amount and the percent decrease.
Apply a Percentage Decrease
Know the percentage already? Use this to find the final value after decreasing.
What is a percentage decrease?
A percentage decrease tells you how much a value has gone down relative to where it started. It answers questions like: “How much did my bill drop?”, “How much cheaper is this item now?”, or “By what percent did revenue decline?”
The key idea is that the original value is the baseline. You compare the drop against that original number, not the new one.
Percentage decrease formula
Use this formula:
Percentage Decrease = ((Original − New) ÷ Original) × 100
- Original = the starting amount.
- New = the ending amount after the decrease.
- Original − New = the amount decreased.
Quick worked example
Suppose a subscription drops from $80 to $60.
- Decrease amount = 80 − 60 = 20
- Percentage decrease = (20 ÷ 80) × 100 = 25%
So the subscription price decreased by 25%.
Common real-world uses
1) Shopping and discounts
When comparing markdowns, percent decrease helps you quickly see which deal is better. A drop from $200 to $150 is a 25% decrease, while $200 to $140 is a 30% decrease.
2) Personal finance
You can track improvements in spending, debt, or fees. For example, if monthly dining costs drop from $500 to $350, you cut spending by 30%.
3) Business and analytics
Teams often monitor declines in churn, complaints, costs, or defect rates. Percentage decrease makes trend reporting clearer, especially when values are different scales.
Percentage decrease vs. related concepts
- Percentage decrease: change relative to the original value.
- Percentage increase: same idea, but the value rises instead of falling.
- Percentage points: used for comparing percentages themselves (for example, 12% to 9% is down 3 percentage points).
Common mistakes to avoid
- Using the new value as the denominator instead of the original value.
- Confusing percentage decrease with a plain subtraction amount.
- Forgetting that a higher new value means there was an increase, not a decrease.
- Mixing percentage points with percent change.
Reference table
| Original | New | Decrease Amount | Percentage Decrease |
|---|---|---|---|
| 100 | 90 | 10 | 10% |
| 250 | 200 | 50 | 20% |
| 1,000 | 750 | 250 | 25% |
| 80 | 60 | 20 | 25% |
FAQ
Can percentage decrease be negative?
If your new value is higher than the original value, the result is not a decrease. It is a percentage increase. This calculator will tell you when that happens.
What if the original value is 0?
Percentage decrease is undefined when the original value is zero because division by zero is not possible.
How many decimal places should I use?
For everyday use, two decimal places are usually enough. For scientific or financial reporting, use the precision your context requires.