Percentage Decrease Calculator
When the new number is smaller than the original, this expresses the drop as a percentage of where you started—common for discounts, weight loss, or budget cuts.
Percent decrease
How this is calculated
Percent decrease = ((original − new) ÷ original) × 100 when new ≤ original. If new is higher, you have a negative “decrease” (i.e., an increase).
Example: $250 → $200 → ((250−200)÷250)×100 = 20% decrease.
Use this tool for
- Sale tags: sticker price vs. checkout price.
- Usage or cost-down targets from a baseline month.
- Teaching how “20% off” relates to original price.
Common questions
Is this the same as discount %?
For a sale, yes—discount off list is the same ratio when “original” is list price and “new” is sale price.
Original smaller than new?
The formula still reports the relative change; read a negative decrease as an increase.
