Percentage Calculator→Specialized Version

Percentage Decrease Calculator

Calculate % decrease

Percentage Decrease Calculator

Calculate the percentage decrease from one value to another. Useful for discounts, depreciation, weight loss, and measuring reductions.

Percentage Decrease Formula

| Formula | Description | ((Old - New) / Old) × 100Standard percentage decrease (1 - New / Old) × 100Alternative formula

Percentage Decrease Examples

OriginalNew Value% Decrease $100$8020% 20015025% 50025050% | 1,000 | 100 | 90% |

Implementation

``javascript function percentageDecrease(original, newValue) { if (original === 0) return 0; return ((original - newValue) / original) * 100; }``

Common Applications

Percentage decrease is used for discounts, depreciation calculations, weight loss tracking, expense reduction, and decline measurements.

Frequently Asked Questions

How do I calculate percentage decrease?

Subtract the new value from the original, divide by the original, and multiply by 100. Formula: ((Original - New) / Original) × 100. For example, going from 100 to 80 is ((100-80)/100) × 100 = 20% decrease.

Can percentage decrease exceed 100%?

No, percentage decrease cannot exceed 100%. A 100% decrease means the value went to zero. Going negative would be calculated differently (as a loss exceeding the original value).

Is a 50% decrease the opposite of 50% increase?

No! A 50% increase from 100 gives 150. A 50% decrease from 150 gives 75, not 100. To reverse a 50% increase, you need a 33.3% decrease. This asymmetry is important in finance.