Percentage guide
Percentage Decrease Calculator
This percentage decrease calculator shows how much a value has fallen compared with its original amount. Use it for sale prices, reduced costs, falling inventory, lower usage, or any change that moves downward.
Calculate a percentage decrease
Enter the original value and the lower new value.
The interactive calculator loads with the page so you can enter your own values and see the result instantly.
How to calculate percentage decrease
Percentage decrease is based on the amount you began with, not the final amount. That baseline makes a $10 reduction mean something different on $20 than it does on $200.
Formula: ((original value − new value) ÷ original value) × 100
- Subtract the new value from the original value to find the amount removed.
- Divide the reduction by the original value.
- Multiply by 100 to show the reduction as a percentage.
Example: a subscription falls from $60 to $45
The reduction is $15. Divide $15 by the original $60 to get 0.25, then multiply by 100. The subscription price decreased by 25%.
Frequently asked questions
How do I work out percentage decrease?
Subtract the new value from the original value, divide by the original value, and multiply by 100. A drop from 60 to 45 is (15 ÷ 60) × 100 = 25%.
Is percentage decrease the same as subtracting percentages?
No. Percentage decrease compares two values using the original value as the baseline. Simply subtracting percentages can give the wrong result when the values are different.
What is the percentage decrease from 60 to 45?
The decrease is 15. Divide 15 by the original 60 and multiply by 100, which gives 25%.
Can a percentage decrease exceed 100%?
For non-negative values, no. A 100% decrease takes a value to zero; a larger decrease would produce a negative new value.
What if the original value is zero?
Percentage decrease from zero is undefined because the calculation divides by the original value.
Why does a decrease and equal increase not cancel out?
They use different baselines. A 20% decrease from 100 gives 80, and a 20% increase from 80 gives 96, not 100.
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