How do you calculate percentage decrease?

Subtract the new value from the original value, divide the result by the original value, then multiply by 100. For example, a drop from 150 to 120 is a 20% decrease.

What is the difference between percentage decrease and percentage change?

Percentage decrease specifically describes a drop from a higher to a lower value and is always reported as a positive percentage. Percentage change can be positive (increase) or negative (decrease) depending on direction.

Why is the original value used as the base instead of the new value?

Percentage decrease measures the drop relative to where you started, since that reflects how significant the reduction is compared to the original amount.

Percentage CalculatorsClient-Side Calculation Engine

Percentage Decrease Calculator

Calculate percentage drop between two values.

Percentage Calculators

Percentage Decrease Calculator

Calculate percentage decrease and drop from an initial value to a lower new value.

Percentage Decrease Values

Original Value

New / Decreased Value

Decrease Calculation Result

Percentage Decrease

20%

Absolute Decrease

Calculation Formula

Percentage Decrease = ((Original Value − New Value) / Original Value) × 100

Find how much a value has dropped, expressed as a percentage of the original value, by subtracting the new value from the original and dividing by the original value.

Where:

Original Value= The starting or "before" value

New Value= The ending or "after" value, which is lower than the original

Step-by-Step Explanation

1Calculate the Decrease Amount

Decrease = Original Value − New Value

Subtract the new (lower) value from the original value to find the raw amount of decrease.

2Convert to a Percentage

Percentage Decrease = (Decrease / Original Value) × 100

Divide the decrease amount by the original value, then multiply by 100 to express it as a percentage.

Worked Calculation Examples

Price Drop

Input:Original: 150, New: 120

Output:20% decrease

(150 − 120) / 150 × 100 = 30 / 150 × 100 = 20%.

Larger Decrease

Input:Original: 200, New: 150

Output:25% decrease

(200 − 150) / 200 × 100 = 50 / 200 × 100 = 25%.

How to Use the Percentage Decrease Calculator

1Enter the original (starting) value.
2Enter the new (lower) value.
3View the decrease amount and percentage decrease instantly.

Pro Tips & Suggestions

•Percentage decrease is always calculated relative to the original value, not the new value - the same dollar drop represents a different percentage depending on the starting point.
•If the new value is higher than the original, you're looking for percentage increase instead.

Frequently Asked Questions

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