Percentage Decrease Calculator
- Amount of decrease
- 20
- Remaining share of original
- 75%
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How to use it
- Enter the original value before the drop.
- Enter the new, lower value.
- Read the percentage decrease and the amount of the reduction.
Examples
Weight loss
Going from 200 lb to 184 lb is a 16 lb drop. 16 ÷ 200 × 100 = an 8% decrease, and you're at 92% of your starting weight.
Website traffic
Weekly visits fell from 12,500 to 9,800. The decrease is 2,700 visits, which is 21.6%.
How percentage decrease is calculated
Subtract the new value from the original, divide by the original, and multiply by 100. The result tells you what fraction of the starting amount was lost.
The “remaining” figure is the complement: a 25% decrease leaves 75% of the original. That is handy for reversing a discount — if something costs $60 after 25% off, the original was 60 ÷ 0.75 = $80.
% decrease = (original − new) ÷ |original| × 100
Frequently asked questions
Why is my percentage decrease negative?
A negative decrease means the new value is larger than the original — the value actually went up. Swap to the percentage increase calculator for that case.
Can a decrease be more than 100%?
Only if the value goes below zero, such as a profit turning into a loss. For quantities that can't be negative, the largest possible decrease is 100%.
Is a percentage decrease the same as a discount?
Mathematically yes. A 20% discount is a 20% decrease in price. The discount calculator adds extras like stacked discounts and sales tax.
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More in Calculators · Last reviewed September 2026