Percentage Decrease Calculator
Formula
% Decrease = ((Old − New) ÷ Old) × 100
To calculate percentage decrease, subtract the new value from the original value, divide by the original value, and multiply by 100.
How to use
- Enter the starting figure in the Original Value field.
- Enter the lower figure in the New Value field.
- Read the percentage decrease and the difference.
Example
Going from an Original Value of 200 to a New Value of 150: (200 - 150) / 200 x 100 = 25%, a 25% decrease of 50.
Frequently Asked Questions
What is the percentage decrease from 200 to 150?
The percentage decrease from 200 to 150 is 25%. (200 − 150) ÷ 200 × 100 = 25%.
Is a 50% decrease the opposite of a 50% increase?
No. A 50% increase on 100 gives 150. A 50% decrease on 150 gives 75, not 100. Percentage changes are not symmetrical.
How do I find the original price before a percentage discount?
Divide the sale price by 1 minus the discount as a decimal. For example, if an item costs $150 after a 25% markdown, the original was 150 / 0.75 = $200. This reverse calculation is useful when you know the final price and the discount but want to confirm the starting amount.
Why do two back-to-back discounts not simply add up?
Stacked discounts apply one after another, so a 20% off followed by another 10% off is not 30% off. Starting at $100, the first cut brings it to $80, then 10% off that leaves $72, a total reduction of 28%. The second discount is taken from the already-lowered price, so the combined effect is always less than the sum.