Percent Decrease Calculator
Calculate the percent decrease between two values — enter the original and the new value to get the percentage drop and the amount of the decrease.
How to calculate percent decrease
Percent decrease tells you how much a value has dropped relative to where it started. Subtract the new value from the original, divide by the original, and multiply by 100. Enter both values above and the calculator returns the percentage and the amount of the change — and if the value actually went up, it shows the increase instead.
percent decrease = (original − new) ÷ original × 100
For example, a price falling from $80 to $60 is (80 − 60) ÷ 80 × 100 = 25% decrease. Always divide by the original value, not the new one — that is the most common mistake.
Percent decrease examples
| From → To | Decrease |
|---|---|
| 100 → 75 | 25% |
| 50 → 40 | 20% |
| 200 → 150 | 25% |
Need the percent of a number, a percent increase, or the percentage one number is of another? The percentage calculator handles all three modes.
Frequently asked questions
How do I calculate percent decrease?
Subtract the new value from the original, divide by the original, and multiply by 100. For a drop from 80 to 60: (80 − 60) ÷ 80 × 100 = 25% decrease. The calculator shows the percentage and the amount of the decrease.
What is the percent decrease formula?
Percent decrease = (original − new) ÷ original × 100. If the result is negative the value actually increased. Always divide by the original (starting) value, not the new one.
What is a 20% decrease of 50?
A 20% decrease of 50 is 50 − (50 × 0.20) = 50 − 10 = 40. To go the other way and find the percentage between two numbers, enter both above and the calculator returns the percent decrease.