Percentage Decrease Calculator
Calculate the percentage decrease between two values quickly and accurately. Enter the original value and the new, lower value, and this calculator will give you the percentage decrease along with step-by-step workings explaining every part of the calculation.
How It Works
A percentage decrease tells you by how much a value has fallen, expressed as a proportion of the original. It is the reverse of percentage increase and follows a very similar formula.
The Formula
% Decrease = ((Original − New Value) ÷ Original) × 100
Subtract the new value from the original, divide the result by the original, and multiply by 100. The answer is always expressed as a positive number representing how much the value has fallen.
When to Use This
Use this calculator when tracking price drops, reduced costs, weight loss, declining figures, or any situation where a quantity has fallen and you want to express the change as a percentage.
Worked Examples
Example 1: Price drops from £400 to £300
((400 − 300) ÷ 400) × 100 = (100 ÷ 400) × 100 = 25%
Example 2: Monthly costs fall from £1,200 to £960
((1200 − 960) ÷ 1200) × 100 = (240 ÷ 1200) × 100 = 20%
Example 3: Calories reduced from 2,500 to 2,000 per day
((2500 − 2000) ÷ 2500) × 100 = (500 ÷ 2500) × 100 = 20%
Example 4: Stock value falls from £8.50 to £6.375
((8.50 − 6.375) ÷ 8.50) × 100 = (2.125 ÷ 8.50) × 100 = 25%
Example 5: Delivery time cut from 5 days to 3 days
((5 − 3) ÷ 5) × 100 = (2 ÷ 5) × 100 = 40%
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