Measure any drop
Use Decrease a number by % to take a percentage off — 25% off a $80 jacket, a 15% budget cut or your weight after losing 5%. It shows the new value and the amount removed.
Use Find the % decrease to compare two values, like a stock that fell from $80 to $68 (a 15% decrease), a gas price dropping from $3.80 to $3.42, or screen time going from 6 hours to 4.
How to calculate a percentage decrease
- 1
Choose the calculation
Reduce a number, or find the decrease between two numbers.
- 2
Enter the values
Original and percentage, or original and new value.
- 3
Read the result
New value, amount removed or percent decrease.
Key features
Apply or measure
Both types of question.
Amount removed
See exactly how much comes off.
Multiplier
For spreadsheet formulas (× 0.75).
Direction check
Flags values that actually went up.
Common uses
- Sales and coupons: Find the price after a discount.
- Budgets: Apply spending cuts.
- Tracking progress: Weight loss, expenses or error rates.
Tips and good to know
- A 50% decrease followed by a 50% increase leaves you at 75% of where you started, not 100%.
- Stacked discounts like 30% off plus an extra 10% are easiest with the Discount Calculator.
Frequently asked questions
How do I decrease a number by a percentage?
Multiply it by (1 − percentage ÷ 100). $80 less 25% is 80 × 0.75 = $60.
How do I find the percentage decrease?
(Old − new) ÷ old × 100. From 80 to 68 is (80 − 68) ÷ 80 × 100 = 15%.
Can a decrease be more than 100%?
Not for amounts that can't go below zero. A 100% decrease means the value reached zero.