BCBetter Calculators

Percentage Decrease Calculator

Calculate the percentage decrease between two values instantly.

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Enter your values and click Calculate

How It Works

Percentage decrease is calculated using the formula: (original − new) ÷ original × 100. The calculator first subtracts the new (lower) value from the original to find the amount of decrease. It then divides that decrease by the original value to express it as a proportion of the starting point, and multiplies by 100 to convert it to a percentage. The raw decrease amount is also shown alongside the percentage for full context. If the new value turns out to be greater than the original, the formula produces a negative result, which represents an increase rather than a decrease — in that case, the Percentage Increase Calculator is the more appropriate tool for clearer labelling and context.

Examples

Sale Discount
An item drops from $100 to $80.
Result: 20% decrease, a reduction of $20.
Weight Loss Progress
Starting weight of 220 lbs drops to 198 lbs.
Result: 10% decrease, a reduction of 22 lbs.
Website Traffic Drop
Monthly visitors fall from 50,000 to 35,000.
Result: 30% decrease, a reduction of 15,000 visitors.

Frequently Asked Questions

How do you calculate percentage decrease?
Subtract the new value from the original value to get the decrease amount. Then divide that amount by the original value and multiply by 100. For example, a drop from 200 to 150 is a decrease of 50, divided by 200, multiplied by 100, giving 25%.
What if the new value is higher than the original?
If the new value is greater than the original, the formula produces a negative result, which actually represents a percentage increase rather than a decrease. Use the Percentage Increase Calculator in that case for clarity.
Is percentage decrease the same as percent change?
They use the same formula when the value is going down. Percentage decrease specifically refers to reductions, while percent change is a broader term that covers both increases and decreases and reports the direction as positive or negative.

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